Updated on 2024/07/15

写真a

 
DENNO Satoshi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • 博士(工学) ( 2000.1   京都大学 )

  • Dr. of Engineering ( 2000.1   Kyoto University )

Education

  • Kyoto University   大学院 工学研究科   分子工学専攻

    1986.4 - 1988.3

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    Country: Japan

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Professional Memberships

Committee Memberships

  • 日本学術会議 電気電子工学委員会 URSI分科会 無線通信システム信号処理小委員会   無線通信システム分野委員  

    2021.4   

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    Committee type:Government

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  • The 24th international symposium on personal multimedia communications (WPMC)   Conference operation chair  

    2020.11 - 2021.12   

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    Committee type:Academic society

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  • 広島県総合行政通信網再編整備検討委員会   副委員長  

    2020.4 - 2021.3   

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    Committee type:Municipal

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  • The 23rd international symposium on wireless personal multimedia communications (WPMC)   Technical program committee chair  

    2019.10 - 2020.10   

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    Committee type:Academic society

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  • 電子情報通信学会 短距離無線通信研究会   委員長  

    2019.6 - 2021.5   

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    Committee type:Academic society

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  • 日本学術会議 電気電子工学委員会 URSI分科会 無線通信システム信号処理小委員会   無線通信システム分野幹事  

    2018.4 - 2021.3   

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    Committee type:Government

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  • 電子情報通信学会 無線通信システム研究会   専門委員  

    2017.6   

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    Committee type:Academic society

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  • 電子情報通信学会 無線通信システム第二種研究会   委員長  

    2017.5 - 2021.5   

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    Committee type:Academic society

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  • 電子情報通信学会 短距離無線通信研究会   副委員長  

    2015.5 - 2019.5   

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    Committee type:Academic society

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  • 電子情報通信学会 無線通信システム研究会   副委員長  

    2015.5 - 2017.5   

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    Committee type:Academic society

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Papers

  • Low Complexity Overloaded MIMO Non-Linear Detector with Iterative LLR Estimation

    Satoshi Denno, Shuhei Makabe, Yafei Hou

    IEICE Transactions on Communications   E107-B ( 3 )   339 - 348   2024.3

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    Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.23919/transcom.2023ebp3118

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  • WLAN Channel Status Duration Prediction for Audio and Video Services Using Probabilistic Neural Networks.

    Yafei Hou, Satoshi Denno

    IEEE Access   12   28201 - 28211   2024

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2024.3365188

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  • Overloaded MIMO Bi-Directional Communication with Physical Layer Network Coding in Heterogeneous Multihop Networks Reviewed

    Satoshi DENNO, Tomoya TANIKAWA, Yafei HOU

    IEICE Transactions on Communications   E106.B ( 11 )   1228 - 1236   2023.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2023ebp3038

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  • Multi Stage LLR Estimation With Ordering in A Non-linear Receiver For Overloaded MIMO Systems Reviewed

    Satoshi Denno, Shuhei Makabe, Yafei Hou

    the 2023 26th International Symposium on Wireless Personal Multimedia Communications   2023.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • An Overloaded MIMO 2-Hop Network With Physical Layer Network Coding Reviewed

    Satoshi Denno, Tomoya Tanikawa, Yafei Hou

    the 2023 28th IEEE Asia-Pacific Conference on Communications   2023.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Adaptive Transmission Signal Allocation and Optimal Modulation Selection for LED Visible Light Wireless Communications by Spatially Parallel Signal Transmission Reviewed

    Harutsuki Tanushi, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    2023 IEEE 12th Global Conference on Consumer Electronics (GCCE)   2023.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/gcce59613.2023.10315678

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  • Iterative User Scheduling Method for MU-MIMO-OFDM Systems. Reviewed

    Akihiko Yamada, Satoshi Denno, Yafei Hou

    GCCE   168 - 169   2023.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315597

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#YamadaDH23

  • Channel Pattern Selection for RIS Based Spatial Modulation System Using Genetic Algorithm. Reviewed

    Issei Maesaki, Haruya Mushiake, Yafei Hou, Satoshi Denno

    GCCE   47 - 48   2023.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315294

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#MaesakiMHD23

  • Low Complexity Resource Allocation in Frequency Domain Non-Orthogonal Multiple Access. Reviewed

    Satoshi Denno, Taichi Yamagami, Yafei Hou

    IEICE Transactions on Communications   106 ( 10 )   1004 - 1014   2023.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.2023ebp3009

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  • Characteristics of Frequency Domain Non-Orthogonal Multiple Wireless Access for IoT. Reviewed

    Yuto Ohba, Satoshi Denno, Yafei Hou

    GCCE   1139 - 1140   2023.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/GCCE59613.2023.10315591

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2023.html#OhbaDH23

  • A Lattice Reduction Aided Overloaded Multi-user MIMO Reviewed

    Kazuki Miyata, Satoshi Denno, Yafei Hou

    the IEEE 98th Vehicular Technology Conference   2023.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Spatial Modulation Proposal for 2-by-2 MIMO System Using Single Leaky Coaxial Cable Reviewed

    Yafei Hou, Soichiro Dake, Shunsuke Kawai, Satoshi Denno

    the IEEE 98th Vehicular Technology Conference   2023.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Simultaneous Localization for Wireless Environments using Leaky Coaxial Cables. Reviewed

    Yafei Hou, Erika Kouda, Yusuke Kawai, Satoshi Denno

    ICCE-Taiwan   733 - 734   2023.7

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICCE-Taiwan58799.2023.10226659

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    Other Link: https://dblp.uni-trier.de/db/conf/icce-tw/icce-tw2023.html#HouKKD23

  • Indoor 3-D Localization over LCX-based Wireless Environment Using Particle Filter Approach. Reviewed

    Junjie Zhu, Kenta Nagayama, Erika Kouda, Yafei Hou, Satoshi Denno

    IEEE Wireless Communications and Networking Conference(WCNC)   1 - 6   2023.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/WCNC55385.2023.10118703

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    Other Link: https://dblp.uni-trier.de/db/conf/wcnc/wcnc2023.html#ZhuNKHD23

  • Reduced Complexity Resource Allocation For Frequency Domain Non-orthogonal Multiple Access Reviewed

    Satoshi Denno, Taichi Yamagami, Yafei Hou

    2023 IEEE Wireless Communications and Networking Conference (WCNC)   2023.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/wcnc55385.2023.10118697

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  • MUSIC Spectrum Based Interference Detection and Localization for mmWave RIS-MIMO System Reviewed

    Yafei Hou, Kazuto Yano, Narisato Suga, Satoshi Denno, Toshikazu Sakano

    2023 25th International Conference on Advanced Communication Technology (ICACT)   1 - 6   2023.2

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.23919/icact56868.2023.10079677

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  • Superposition Signal Input Decoding For Lattice Reduction-aided MIMO Receivers Reviewed

    Satoshi DENNO, Koki KASHIHARA, Yafei HOU

    IEICE Transactions on Communications   106 ( 2 )   184 - 192   2023.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2022ebp3051

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  • Multi-input Physical Layer Network Coding in Two-Dimensional Wireless Multihop Networks Reviewed

    Hideaki TSUGITA, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   106 ( 2 )   193 - 202   2023.2

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2022ebp3062

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  • Adaptive Collaborative Relaying in High Mobility Environment Reviewed

    Satoshi Denno, Takuma Fujii, Yafei Hou

    the 25th International Symposium on Wireless Personal Multimedia Communications (WPMC 2022)   54 - 58   2022.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/WPMC55625.2022.10014789

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    Other Link: https://dblp.uni-trier.de/db/conf/wpmc/wpmc2022.html#DennoFH22

  • Genetic Algorithm Based Channel Pattern Selection for Spatial Modulation Using Slots of Leaky Coaxial Cable Reviewed

    Kenta Nagayama, Erika Kouda, Junjin Zhu, Yafei Hou, Satoshi Denno

    the 25th International Symposium on Wireless Personal Multimedia Communications (WPMC 2022)   221 - 225   2022.11

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/WPMC55625.2022.10014813

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    Other Link: https://dblp.uni-trier.de/db/conf/wpmc/wpmc2022.html#NagayamaKZHD22

  • Adaptive Resource Allocation Based on Factor Graphs in Non-Orthogonal Multiple Access Reviewed

    Taichi YAMAGAMI, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E105.B ( 10 )   1258 - 1267   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2021ebp3213

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  • A Low Complexity Non-linear Iterative Receiver for Overloaded MIMO-OFDM Systems Reviewed

    Shuhei Makabe, Satoshi Denno, Yafei Hou

    the 2022 27th Asia Pacific Conference on Communications (APCC2022)   488 - 493   2022.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/APCC55198.2022.9943716

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    Other Link: https://dblp.uni-trier.de/db/conf/apcc/apcc2022.html#MakabeDH22

  • A Non-Linear Distortion Noise Canceller for Pre-Distortion Characteristic Error Compensation in LED Visible Light Communications Reviewed

    Norihiro Tokui, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    the 2022 IEEE 10th Globa; Conference on Consumer Electronics (GCCE 2022)   198 - 201   2022.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/GCCE56475.2022.10014227

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    Other Link: https://dblp.uni-trier.de/db/conf/gcce/gcce2022.html#TokuiTDU22

  • Asynchronous Periodic Interference Signals Cancellation in Frequency Domain Reviewed

    Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E105.B ( 9 )   1087 - 1096   2022.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2021ebp3187

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  • Particle Filter-Based Indoor Localization and Tracking Method Using Leaky Coaxial Cables Reviewed

    Junjie Zhu, Kenta Nagayama, Erika Kouda, Yafei Hou, Satoshi Denno

    2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'22)   856 - 861   2022.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/PIMRC54779.2022.9977753

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    Other Link: https://dblp.uni-trier.de/db/conf/pimrc/pimrc2022.html#ZhuNKHD22

  • Low Complexity Soft Decoding With Superposition of Hard Decision Vectors in Lattice Reduction-Aided Linear Receivers Reviewed

    Satoshi Denno, Koki Kashihara, Yafei Hou

    2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'22)   271 - 275   2022.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/PIMRC54779.2022.9977505

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    Other Link: https://dblp.uni-trier.de/db/conf/pimrc/pimrc2022.html#DennoKH22

  • Receivable signal sequence number increase in LED visible light wireless communications by spatially parallel signal transmission Reviewed

    Ryosuke Okamoto, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    IEICE Communications Express   11 ( 6 )   296 - 301   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/comex.2022xbl0028

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  • Evaluation of sensor terminal signal separation performance based on modulation systems in storage-based batch signal processing using STFT Reviewed

    Takuyuki Hirakawa, Toru Nishiyama, Syo Nakaie, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    IEICE Communications Express   11 ( 6 )   319 - 323   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/comex.2022xbl0001

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  • Periodic Interference Cancellation With Drift Estimation Based on Super-Resolution Techniques in Frequency Domain Reviewed

    Satoshi Denno, Yafei Hou

    2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring)   1 - 5   2022.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/vtc2022-spring54318.2022.9860405

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  • Maximum Doppler Frequency Detection Based on Likelihood Estimation With Theoretical Thresholds Reviewed

    Satoshi DENNO, Kazuma HOTTA, Yafei HOU

    IEICE Transactions on Communications   E105.B ( 5 )   657 - 664   2022.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2021ebp3075

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  • A Proposal of Spatial Modulation Using On/Off the Slots of Leaky Coaxial Cable Reviewed

    Kenta Nagayama, Junjie Zhu, Pengcheng Hou, Yafei Hou, Satoshi Denno

    2022 IEEE 4th Global Conference on Life Sciences and Technologies (LifeTech)   1 - 5   2022.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754939

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    Other Link: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#NagayamaZHHD22

  • Two-dimensional RSSI-Based Indoor Localization Using Multiple Leaky Coaxial Cables with a Probabilistic Neural Network Reviewed

    Junjie Zhu, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno, Rian Ferdian

    IEEE Access   10   21109 - 21119   2022

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/access.2022.3153083

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  • Prediction Evaluation for RSSI Data Generated from Leaky Coaxial Cables over Indoor Environment. Reviewed

    Pengcheng Hou, Junjie Zhu, Kenta Nagayama, Yafei Hou, Satoshi Denno

    ICCE   1 - 5   2022

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/ICCE53296.2022.9730575

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    Other Link: https://dblp.uni-trier.de/db/conf/iccel/icce2022.html#HouZNHD22

  • Indoor Simultaneous TOA Estimation of Multiple Users Using Leaky Coaxial Cable. Reviewed

    Junjie Zhu, Erika Kouda, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno

    LifeTech   297 - 298   2022

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech53646.2022.9754835

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    Other Link: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2022.html#ZhuKHNHD22

  • User Mobility Estimation Through Maximum Doppler Frequency Detection Reviewed

    Satoshi Denno, Kazuma Hotta, Yafei Hou

    2021 15th International Conference on Signal Processing and Communication Systems (ICSPCS2021)   1 - 5   2021.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/ICSPCS53099.2021.9660311

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    Other Link: https://dblp.uni-trier.de/db/conf/icspcs/icspcs2021.html#DennoHH21

  • Adaptive Resource Allocation Based on Factor Graphs in Non-Orthogonal Multiple Access Reviewed

    Taichi Yamagami, Satoshi Denno, Yafei Hou

    The 24th International Symposium on Wireless Personal Multimedia Communications (WPMC 2021)   1 - 5   2021.12

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    In this paper, we propose a non-orthogonal multiple access with adaptive resource allocation based on factor graphs. The proposed non-orthogonal multiple access assigns multiple frequency resources for each device to send their packet. Even if the number of the devices is more than the frequency resources, the proposed non-orthogonal access allows all the devices to transmit their packets simultaneously for high capacity massive machine type communication (mMTC). Furthermore, this paper proposes adaptive resource allocation based on factor graphs that adaptively allocates the frequency resources to the devices for improvement of the transmission performances. This paper proposes two allocation criteria for the proposed adaptive allocation. This paper shows that the proposed non-orthogonal multiple access achieves superior transmission performance in 4-path Rayleigh fading channel with overloading ratio of 1.5, even without the adaptive resource allocation. The adaptive resource allocation enables the proposed non-orthogonal access to attain a gain of about 5 dB at the BER of 10(-4).

    DOI: 10.1109/WPMC52694.2021.9700454

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  • Receivable Signal Sequence Number Increase by Spatially Parallel Signal Transmission in LED Visible Light Wireless Communications Reviewed

    Ryosuke Okamoto, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    The 2021 IEICE 2nd International Conference on Emerging Technologies for Communications (ICETC)   1 - 5   2021.12

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  • A Compensation Method for Both Amplitude Deviation of Frequency Response and Non-Linear Distortion in LED Visible Light Wireless Communications Reviewed

    Takeru Fukuyama, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    2021 20th International Symposium on Communications and Information Technologies (ISCIT)   114 - 117   2021.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/iscit52804.2021.9590603

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  • Cyclic path switching for lattice reduction-aided iterative linear receivers in overloaded MIMO systems Reviewed

    Satoshi Denno, Takuya Fujiwara, Yafei Hou

    IEICE Communications Express   10 ( 10 )   810 - 815   2021.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/comex.2021xbl0133

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  • Eigenvalue Based Relay Selection for XOR-Physical Layer Network Coding in Bi-Directional Wireless Relaying Networks Reviewed

    Satoshi DENNO, Kazuma YAMAMOTO, Yafei HOU

    IEICE Transactions on Communications   E104.B ( 10 )   1336 - 1344   2021.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2020ebp3183

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  • Examination of signal separation/demodulation method of multi-value modulation sensor terminal signal using STFT in storage batch signal processing Reviewed

    Toru Nishiyama, Takuyuki Hirakawa, Syo Nakaie, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    IEICE Communications Express   10 ( 8 )   458 - 462   2021.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/comex.2021etl0007

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  • Out-of-Bound Signal Demapping for Lattice Reduction-Aided Iterative Linear Receivers in Overloaded MIMO Systems Reviewed

    Takuya FUJIWARA, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E104.B ( 8 )   974 - 982   2021.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2020ebp3180

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  • Busy/Idle Duration Prediction for Video and Audio WLAN Traffics Using Autoregressive Predictor with Data Categorization Reviewed

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    2021 23rd International Conference on Advanced Communication Technology (ICACT)   259 - 264   2021.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.23919/icact51234.2021.9370597

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  • Busy/Idle Duration Models of Video and Audio WLAN Traffics and Their Prediction Performance. Reviewed

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    The 23rd international conference on advanced communications technology (ICACT)   202 - 203   2021.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/LifeTech48969.2020.1570619143

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    Other Link: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2020.html#HouKD20

  • A Study of Throughput Prediction using Convolutional Neural Network over Factory Environment Reviewed

    Yafei Hou, Kazuto Yano, Norisato Suga, Julian Webber, Eiji Nii, Toshihide Higashimori, Satoshi Denno, Yoshinori Suzuki

    The 23rd international conference on adavanced communications technology (ICACT)   1 - 5   2021.2

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.23919/ICACT53585.2022.9728893

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    Other Link: https://dblp.uni-trier.de/db/conf/icact/icact2022.html#HouYSWNHDS22

  • Frequency Domain Iterative Cancellation of Periodic Noise Reviewed

    Yuya Furutani, Satoshi Denno, Yafei Hou

    2020 International Symposium on Antennas and Propagation (ISAP)   1 - 2   2021.1

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Modeling and Predictability Analysis on Channel Spectrum Status Over Heavy Wireless LAN Traffic Environment. Reviewed

    Yafei Hou, Julian Webber, Kazuto Yano, Shun Kawasaki, Satoshi Denno, Yoshinori Suzuki

    IEEE Access   9   85795 - 85812   2021

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2021.3088123

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  • Capacity Loss From Localization Error in MIMO Channel Using Leaky Coaxial Cable. Reviewed

    Junjie Zhu, Yafei Hou, Kenta Nagayama, Satoshi Denno

    IEEE Access   9   15929 - 15938   2021

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2021.3053034

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  • Non-Orthogonal Packet Access Based on Low Density Signature With Phase Only Adaptive Precoding. Reviewed

    Satoshi Denno, Ryoko Sasaki, Yafei Hou

    IEICE Trans. Commun.   104-B ( 3 )   328 - 337   2021

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  • Precoded Physical Layer Network Coding with Coded Modulation in MIMO-OFDM Bi-Directional Wireless Relay Systems. Reviewed

    Satoshi Denno, Kazuma Yamamoto, Yafei Hou

    IEICE Trans. Commun.   104-B ( 1 )   99 - 108   2021

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    DOI: 10.1587/transcom.2020EBP3045

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  • Low-Complexity Implementation of Channel Estimation for ESPAR-OFDM Receiver. Reviewed

    Yafei Hou, Rian Ferdian, Satoshi Denno, Minoru Okada

    IEEE Trans. Broadcast.   67 ( 1 )   238 - 252   2021

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    DOI: 10.1109/TBC.2020.3039679

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  • Multi-Input Physical Layer Network Coding In Wireless Two-Way Relay Networks. Reviewed

    Hideaki Tsugita, Satoshi Denno, Yafei Hou

    17th IEEE VTC Asia Pacific Wireless Communications Symposium (IEEE VTS APWCS 2021),   1 - 5   2021

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    DOI: 10.1109/APWCS50173.2021.9548758

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  • Partial Perturbation to Alleviate the Performance Degradation of Vector Perturbation With Inaccurate Power Scaling Factors. Reviewed

    Yafei Hou, Satoshi Denno

    IEEE Trans. Broadcast.   67 ( 1 )   324 - 336   2021

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    DOI: 10.1109/TBC.2020.2977514

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  • RSSI-Based Indoor Localization Using Leaky Coaxial Cable with a PNN Approach. Reviewed

    Junjie Zhu, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno

    The 2021 IEEE 10th Globa; Conference on Consumer Electronics (GCCE 2021)   220 - 221   2021

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    DOI: 10.1109/GCCE53005.2021.9622078

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  • Indoor Localization Using Leaky Coaxial Cable over a Multipath-rich Linear Cell Environment. Reviewed

    Junjie Zhu, Kenta Nagayama, Yafei Hou, Satoshi Denno

    IEEE 3rd global conference on life science and technologies,   280 - 281   2021

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    DOI: 10.1109/LifeTech52111.2021.9391899

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  • A Study of Throughput Prediction using Convolutional Neural Network over Factory Environment.

    Yafei Hou, Kazuto Yano, Norisato Suga, Julian L. Webber, Eiji Nii, Toshihide Higashimori, Satoshi Denno, Yoshinori Suzuki

    23rd International Conference on Advanced Communication Technology(ICACT)   429 - 434   2021

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    DOI: 10.23919/ICACT51234.2021.9370905

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  • Busy/Idle Duration Prediction for Video and Audio WLAN Traffics Using Autoregressive Predictor with Data Categorization.

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    23rd International Conference on Advanced Communication Technology(ICACT)   259 - 264   2021

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    DOI: 10.23919/ICACT51234.2021.9370597

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  • Channel Status Prediction using Auto-regressive and Auto-regressive Integrated Predictors over WLAN Channel Reviewed

    Yafei Hou, Naoya Hokimoto, Satoshi Denno

    International Journal of Computer & Software Engineering   5 ( 2 )   2020.12

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    DOI: 10.15344/2456-4451/2020/159

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  • A study on window function and window width of STFT in collision signal separation and demodulation method using stored batch signal processing Reviewed

    Toru Nishiyama, Takuyuki Hirakawa, Sho Nakaya, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    the 2020 IEICE 1st International Confernce on Emerging Technologies for Communications (ICETC)   X10-B   1 - 5   2020.12

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  • Transmission performance of highly efficient modulation by collaborative linearization processing in both transmitter and receiver for LED visible light communications Reviewed

    Keitaro Hirai, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    the 2020 IEICE 1st International Confernce on Emerging Technologies for Communications (ICETC)   1 - 5   2020.12

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  • Transmission performance of a digital pre-distortion method followed by adaptive compander for LED visible light communications Reviewed

    Saroma Era, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    the 2020 IEICE 1st International Confernce on Emerging Technologies for Communications (ICETC)   1 - 5   2020.12

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  • A Flexible Overloaded MIMO Receiver with Adaptive Selection of Extended Rotation Matrices Reviewed

    Satoshi DENNO, Akihiro KITAMOTO, Ryosuke SAWADA

    IEICE Transactions on Communications   E103.B ( 7 )   787 - 795   2020.7

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    DOI: 10.1587/transcom.2017ebp3203

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  • Low Complexity Soft Decoding For Physical Layer Network Coding With Coded Modulation. Reviewed

    Satoshi Denno, Tomoya Tanikawa, Hideaki Tsugita, Yafei Hou

    2020 14th International Conference on Signal Processing and Communication Systems (ICSPCS2020)   1 - 5   2020

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    DOI: 10.1109/ICSPCS50536.2020.9310008

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  • Two Dimensional Indoor Localization with Multiple Leaky Coaxial Cables. Reviewed

    Junjie Zhu, Pengcheng Hou, Yafei Hou, Satoshi Denno, Minoru Okada

    The 2020 IEEE 7th Global Conference on Consumer Electronics (GCCE)   626 - 627   2020

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    DOI: 10.1109/GCCE50665.2020.9291828

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  • Low Complexity Soft Input Decoding in an Iterative Linear Receiver for Overloaded MIMO. Reviewed

    Satoshi Denno, Tsubasa Inoue, Yuta Kawaguchi, Takuya Fujiwara, Yafei Hou

    IEICE Trans. Commun.   103-B ( 5 )   600 - 608   2020

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    DOI: 10.1587/transcom.2019EBP3159

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  • Bit Stream Decorrelation in An Iterative Overloaded MIMO Receiver for Higher-Order QAMs. Reviewed

    Takuya Fujiwara, Satoshi Denno, Yafei Hou

    the 23th International Symposium on Wireless Personal Multimedia Communications (WPMC 2020)   1 - 5   2020

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    DOI: 10.1109/WPMC50192.2020.9309510

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  • A study for 2-D indoor localization using multiple leaky coaxial cables Reviewed

    Junjie Zhu, Pengcheng Hou, Yafei Hou, Satoshi Denno, Minoru Okada

    APSIPA TRANSACTIONS ON SIGNAL AND INFORMATION PROCESSING   9   2020

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    Indoor localization technology, which can provide the location information of the target object or stochastic things, is becoming essential requirement for many applications and services such as Internet-of-Things (IoT), real-time control in the development of Fifth-generation (5G) technology. Leaky coaxial cable which can be used as antennas is able to detect the location of the user in a simple way due to its potential property. In this paper, we proposes a simple method to improve the localization accuracy of 2-D indoor localization using multiple LCX cables. In addition, we also evaluate the channel capacity loss due to the localization error of the LCX-MIMO using our proposed method.

    DOI: 10.1017/ATSIP.2020.18

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  • LED Lighting Arrangement for Spatially Parallel Signal Transmission in Visible Light Communication. Reviewed

    Yusuke Kamei, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    the 2019 IEEE 7th Global Conference on Consumer Electronics (GCCE)   1123 - 1126   2019.10

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    DOI: 10.1109/GCCE46687.2019.9015428

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  • A Study of Capacity Loss from Localization Error in MIMO Channel Using Leaky Coaxial Cable. Reviewed

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

    The 2019 IEEE 7th Global Conference on Consumer Electronics (GCCE),   1002 - 1003   2019.10

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    DOI: 10.1109/GCCE46687.2019.9015621

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  • Iterative Soft Input Decoding with Assistance of Lattice Reduction for Overloaded MIMO. Reviewed

    Satoshi Denno, Tsubasa Inoue, Takuya Fujiwara, Yafei Hou

    The IEEE 90th Vehicular Technology Conference (VTC2019-fall)   1 - 5   2019.9

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    DOI: 10.1109/VTCFall.2019.8891589

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  • Adaptive Sideband Selection for Periodic Interference Cancellation Reviewed

    Yuya Kimura, Satoshi Denno, Yafei Hou

    IEICE Trans. Commun   J102-B ( 8 )   595 - 604   2019.8

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    This paper proposes adaptive sideband selection for periodic interference cancellation. The proposed selection improves SINR (Signal to Interference and Noise power Ratio) by providing selected sideband signals, even in environment some signals are received. An algorithm that selects such sideband signals is shown. The proposed selection are analyzed theoretically and evaluated by computer simulation. The proposed selection achieves 26dB better SINR performance than random selection in the channel with CIR (Carrier to Interference power Ratio) of 0dB and CNR (Carrier to Noise power Ratio) of 30dB, and achieves the same performance as the selection method that maximize SINR with computational amount of 1/100.

    DOI: 10.14923/transcomj.2018wfp0011

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  • Optical Radio Channel Propagation in Wireless Communication Systems with LEDs Reviewed

    Satoshi Denno, Shunsuke Fujitaka, Yafei Hou, Shigeru Tomisato, Kazuhiro Uehara

    The 12th Global Symposium on Millimeter Waves (GSMM)   1 - 5   2019.5

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  • Near Optimum User Selection for Minimum Mean Square Error Based Tomlinson Harashima Precoding Reviewed

    Satoshi Denno, Tomoyuki Baba, Kenta Asaka, Yafei Hou

    International Journal of Computer & Software Engineering   4 ( 1 )   2019.1

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    DOI: 10.15344/2456-4451/2019/142

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  • Busy/idle duration model for WLAN traffic and its prediction performance using autoregressive method

    Yafei Hou, Yusuke Tanaka, Julian Webber, Kazuto Yano, Satoshi Denno, Tomoaki Kumagai

    Asia-Pacific Microwave Conference Proceedings, APMC   2018-November ( APMC )   893 - 895   2019.1

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    This paper will study the busy/idle duration model and its prediction performance of autoregressive (AR) based predictor using the real environment data collected during rush-hour weekday evening at a railway station. The analysis shows that both busy and idle duration distribution largely appear as a generalized Pareto (GP) distribution with a different scale value. In addition, the scale value highly decides the prediction performance of the low-complexity linear AR based predictor. We also propose a new AR based predictor by separating busy/idle duration data into different streams to differentiate the scale value of the streams. The prediction performance of the proposed predictor can be improved for the streams with small scale value.

    DOI: 10.23919/APMC.2018.8617663

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  • Low Density Signature Based Packet Access with Phase Only Adaptive Precoding. Reviewed

    Satoshi Denno, Ryoko Sasaki, Yafei Hou

    The IEEE 89th Vehicular Technology Conference (VTC2019)-Spring   1 - 5   2019

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    DOI: 10.1109/VTCSpring.2019.8746451

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  • Coded Quadrature Amplitude Modulations For XOR Physical Layer Network Coding With Precoding. Reviewed

    Satoshi Denno, Kazuma Yamamoto, Yafei Hou

    The 22nd International Symposium on Wireless Personal Multimedia Communications (WPMC 2019)   1 - 6   2019

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    DOI: 10.1109/WPMC48795.2019.9096064

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  • XOR Physical Layer Network Coding with Non-Linear Precoding for Quadrature Amplitude Modulations in Bi-Directional MIMO Relay Systems. Reviewed

    Satoshi Denno, Yuto Nagai, Yafei Hou

    IEICE Trans. Commun.   102-B ( 10 )   2073 - 2081   2019

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    DOI: 10.1587/transcom.2018EBP3346

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  • A Novel Low Complexity Lattice Reduction-Aided Iterative Receiver for Overloaded MIMO. Reviewed

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Yafei Hou

    IEICE Trans. Commun.   102-B ( 5 )   1045 - 1054   2019

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    DOI: 10.1587/transcom.2018EBP3215

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  • Capacity of 4-by-4 MIMO Channel Using One Composite Leaky Coaxial Cable With User Position Information. Reviewed

    Yafei Hou, Junjie Zhu, Satoshi Denno, Minoru Okada

    IEEE Trans. Veh. Technol.   68 ( 11 )   11042 - 11051   2019

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    DOI: 10.1109/TVT.2019.2942945

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  • Relay Selection for Bi-directional Relay Systems with XOR-Phisical Layer Network Coding. Reviewed

    Kazuma Yamamoto, Satoshi Denno, Yafei Hou

    the 1The IEEE VTS Asia Pacific Wireless Communications symposium (IEEE VTS APWCS 2019)   1 - 5   2019

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    DOI: 10.1109/VTS-APWCS.2019.8851618

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  • Adaptive Periodic Interference Cancellation for Narrow-Band Wireless Systems Reviewed

    SATO Yuichiro, DENNO Satoshi, KARUBE Toshikazu

    J101-B ( 8 )   627 - 636   2018.8

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    This paper proposes an adaptive periodic interference cancellation for narrow-band wireless systems. The proposed cancellation mitigates performance degradation caused by undesired electromagnetic waves emitted from high voltage circuits such as inverters. The received signals are converted into frequency domain where the interference is cancelled with the replica of the interference. Because the phase noise of the undesired electromagnetic waves causes serious performance degradation in the proposed canceller, moreover, this paper proposes phase noise estimation which detects the phase noise of the periodic interference by using singular value decomposition. It is verified by computer simulation that the proposed canceller achieves a gain of 20dB in the environment with CNR of 20dB, INR (interference to noise power ratio) of 0dB.

    DOI: 10.14923/transcomj.2018JBP3002

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  • Uplink Multiuser MIMO Access with Probe Packets in Distributed Wireless Networks. Reviewed

    Satoshi Denno, Yusuke Murakami

    IEICE Trans. Commun.   101-B ( 6 )   1443 - 1452   2018.6

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    DOI: 10.1587/transcom.2017EBP3364

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  • Performance Analysis of Low Complexity Lattice Reduction-Aided Iterative Receiver for Overloaded MIMO. Reviewed

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Yafei Hou

    The 12 International Conference on Signal Processing and Communication Systems (ICSPCS 2018),   1 - 5   2018

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    DOI: 10.1109/ICSPCS.2018.8631747

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  • Doppler Frequency Estimation using Overlap Frequency Domain Equalization. Reviewed

    Kohei Hashimoto, Satoshi Denno, Kazuoki Ichikawa, Takashi Okada, Yuji Aburakawa

    The 21st International Conference on Wireless Personal Multimedia Communications (WPMC2018),   256 - 261   2018

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    DOI: 10.1109/WPMC.2018.8712991

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  • [Invited Paper] Adaptive Configuration of Forward Channels for Terminal Collaborative Reception Invited Reviewed

    Satoshi Denno, Daisuke Umehara

    ITE Transactions on Media Technology and Applications   6 ( 1 )   82 - 90   2018

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    DOI: 10.3169/mta.6.82

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  • Low-complexity Power Allocation with Positional Information for 4-by-4 MIMO Channel using One Composite Leaky Coaxial Cable Reviewed

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

    2018 IEEE 7TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE 2018)   841 - 842   2018

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    Leaky coaxial (LCX) cable can be used as antenna for wireless communication system and wireless power transfer which can be widely applied for many application scenarios including wireless service for IoT, automated factory using a large number of wireless devices. We have designed that one LCX cable can be used as two antennas which can releases the space requirement of MIMO deployment for wireless application. In this paper, we will further evaluate the 4-by-4 LCX-MIMO channel using one composite cable with two LCX cables. In addition, we also propose a low-complexity power allocation method for the LCX-MIMO system with the user's positional information (PI). The results show that the capacity is promising when the spacing between LCX cables is small as to 2cm. In addition, our proposed low-complexity power allocation has better capacity than that of using equal power allocation when SNR value is over the low range.

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  • Adaptive forward link formation for terminal collaborative reception. Reviewed

    Satoshi Denno, Hidekazu Murata, Daisuke Umehara

    The 20th International Symposium on Wireless Personal Multimedia Communications (WPMC 2017)   292 - 296   2017.12

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    DOI: 10.1109/WPMC.2017.8301826

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  • フィードバック情報量低減を可能にする基地局協調システムのための線形プリコーディング Reviewed

    田野 哲, 田谷 昭仁, 村田 英一, 梅原 大祐, 山本 高至, 吉田 進, 守倉 正博

    電子情報通信学会論文誌 B   J100-B ( 3 )   270 - 279   2017.3

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    DOI: 10.14923/transcomj.2016JBP3048

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  • New MU-MIMO random access employing THP with correlation based user scheduling. Reviewed

    Tomoyuki Baba, Satoshi Denno

    The 14th IEEE VTS Asia Pacific Wireless Communications symposium (IEEE VTS APWCS 2017)   1 - 5   2017

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    DOI: 10.1109/ICSPCS.2017.8270450

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  • Transmission quality improvement by LED back-off optimization for visible light wireless communications. Reviewed

    Takahiro Chikamori, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    The 20th International Symposium on Wireless Personal Multimedia Communications (WPMC 2017)   229 - 233   2017

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    DOI: 10.1109/WPMC.2017.8301814

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  • Nonlinear Precoding for XOR Physical Layer Network Coding in Bi-Directional MIMO Relay Systems. Reviewed

    Lengchi Cao, Satoshi Denno

    IEICE Trans. Commun.   100-B ( 3 )   440 - 448   2017

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    DOI: 10.1587/transcom.2016EBP3236

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  • Simplified Maximum Likelihood Detection with Unitary Precoding for XOR Physical Layer Network Coding. Reviewed

    Satoshi Denno, Daisuke Umehara

    IEICE Trans. Commun.   100-B ( 1 )   167 - 176   2017

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    DOI: 10.1587/transcom.2016EBP3064

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  • An iterative noise cancelling receiver with soft-output LR-aided detection for collaborative reception. Reviewed

    Satoshi Denno, Yuta Kawaguchi, Hidekazu Murata, Daisuke Umehara

    The 19th International Symposium on Wireless Personal Multimedia Communications (WPMC 2016)   37 - 41   2016

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  • Success prioritized distributed coordination function Reviewed

    Daisuke Umehara, Hidekazu Murata, Satoshi Denno

    IEICE COMMUNICATIONS EXPRESS   5 ( 9 )   303 - 308   2016

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    In this letter, we present a random access protocol with success priority, success prioritized distributed coordination function (SP-DCF), based on IEEE 802.11 DCF. Success stations (STAs) are prioritized contentionlessly to transmit the next data frame in the transmit queue in a random manner. We develop a performance analysis model of SP- DCF which enables us to estimate a variety of performance indexes such as the throughput or the frame discard rate (FDR) in a high accuracy for saturated wireless networks. The numerical analysis and simulation results show that the proposed SP-DCF achieves higher throughput and lower FDR as compared with the conventional DCF especially for heavily-congested wireless networks.

    DOI: 10.1587/comex.2016XBL0083

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  • 5. Receivers Employing Virtual Channels for Overloaded MIMO Systems

    Denno Satoshi

    The Journal of The Institute of Image Information and Television Engineers   70 ( 1 )   23 - 27   2016

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    DOI: 10.3169/itej.70.23

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  • センサネットワーク用適応送信型センサ協調ビーム形成法 Reviewed

    藤田 将大, 別府 多久哉, 冨里 繁, 田野 哲, 秦 正治

    電子情報通信学会論文誌 B   J98-B ( 10 )   1146 - 1154   2015.10

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  • Physical layer network coding using THP for Bi-directional MIMO relay systems

    Lengchi Cao, Satoshi Denno

    2015 IEEE Wireless Communications and Networking Conference, WCNC 2015   1482 - 1487   2015.6

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    Bi-directional relaying has been demonstrated to raise transmission throughput intensively as large as twice in throughput by applying physical layer network coding (PNC) when a pair of terminals exchange information via relay. With the aim to enhance the performance of relay system based on decode-and-amplify (DF) strategy, we propose a PNC scheme using Tomlinson-Harashima precoding (THP). Assuming the same broadcast scheme, our proposed scheme shows better performance than conventional linear precoding scheme. To reduce the transmission power without increasing bit error rate (BER), we further introduce a power controlling (PC) structure. It is proved that the transmission power and BER can both be reduced with the power controlling method.

    DOI: 10.1109/WCNC.2015.7127687

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  • An Iterative MIMO Receiver Employing Virtual Channels with a Turbo Decoder for OFDM Wireless Systems. Reviewed

    Akihito Taya, Satoshi Denno, Koji Yamamoto, Masahiro Morikura, Daisuke Umehara, Hidekazu Murata, Susumu Yoshida

    IEICE Trans. Commun.   98-B ( 5 )   878 - 889   2015

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    DOI: 10.1587/transcom.E98.B.878

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  • An overloaded MIMO receiver with extended rotation matrices for virtual channels. Reviewed

    Satoshi Denno, Akihiro Kitamoto

    The Asia Pacific Conference on Communications, APCC'15   52 - 56   2015

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    DOI: 10.1109/APCC.2015.7412565

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  • Performance evaluation of device discovery in bluetooth LE with probabilistic model checking. Reviewed

    Yusuke Matsuo, Daisuke Umehara, Hidekazu Murata, Satoshi Denno

    IEICE 10th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT)   1 - 3   2015

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    DOI: 10.1109/APSITT.2015.7217125

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  • Transmission characteristics of OFDM packets in 5 GHz band using USRP. Reviewed

    Satoshi Nakao, Daisuke Umehara, Hidekazu Murata, Satoshi Denno

    10th Asia-Pacific Symposium on Information and Telecommunication Technologies(APSITT)   1 - 3   2015

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    DOI: 10.1109/APSITT.2015.7217126

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  • Difference Analysis in IEEE 802.11 DCF Reviewed

    Daisuke Umehara, Hidekazu Murata, Satoshi Denno

    2015 10th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT)   2015

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    In this paper, a simple and accurate estimation on performance of the original IEEE 802.11 distributed coordination function (DCF) is presented. The performances obtained from the Bianchi's analytical model of the IEEE 802.11 DCF are compensated by means of (1) the number of consecutive successful transmissions and (2) the deferred slot time. The compensated performances including throughput, packet loss rate, and the average number of transmissions approximate to the simulation results with a high degree of accuracy under a number of conditions even when the minimum contention window is small. The analytical and simulation results show us the possibility of performance improvement by the sender priority.

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  • IEEE 802.11 DCF with Successful Transmission Priority Reviewed

    Daisuke Umehara, Hidekazu Murata, Satoshi Denno

    2015 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2015

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    In this paper, we propose a distributed coordination function with successful transmission priority (DCF-STP) based on IEEE 802.11 DCF. DCF-STP will enhance the throughput and reduce the frame discard rate (FDR) in wireless networks because the wireless station (WS) just after the successful transmission has an opportunity to transmit the next frame without contention. We also develop a performance analytical model which enables to estimate the throughput, FDR, and the average number of frame retransmissions with high accuracy for saturated wireless networks. The simulation results show the validity of the developed performance analytical model of DCF-STP and the characteristics in the coexistence of the conventional DCF and the proposed DCF-STP.

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  • Transmit beamforming with DOA estimation in fast fading channels with AOA spread Reviewed

    Satoshi Denno, Shigeru Tomisato, Masaharu Hata, Tatsuo Furuno, Yasuhiro Oda

    2014 International Symposium on Antennas and Propagation Conference Proceedings   2014.12

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    DOI: 10.1109/isanp.2014.7026492

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  • Iterative SVD-based frequency offset estimation with decorrelation for wireless sensor networks Reviewed

    Satoshi Denno, Masataka Hasebe, Shigeru Tomisato, Masaharu Hata

    2014 International Symposium on Wireless Personal Multimedia Communications (WPMC)   2014.9

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    DOI: 10.1109/wpmc.2014.7014807

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  • A Non-Linear Distortion Noise Power Control Method for Multi-Band OFDM Transmission Reviewed

    Shohei Masaki, Shigeru Tomisato, Satoshi Denno, Masaharu Hata, Tatsuo Furuno, Yasuhiro Oda

    2014 INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS (WPMC)   748 - 753   2014

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    This paper proposes a non-linear distortion noise power control method which uses clipping and in-band and out-of-band filtering methods for multi-band OFDM transmission. The proposed method selects appropriate clipping levels and filtering methods according to transmission power and required noise power conditions on own and the other system bands in a transmitter. The evaluation results show that the proposed method can control in-band and out-of-band distortion noise power so that required noise power conditions can be satisfied in multi-band transmission systems.

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  • A Virtual Channel Detector for Iterative Receiver in Overloaded MIMO OFDM Systems Reviewed

    Satoshi Denno, Akihito Taya, Masahiro Morikura

    2014 8TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2014

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    Iterative MIMO receivers with virtual channel are known to outperform linear detectors in overloaded multiple-input multiple-output systems with orthogonal-frequency division multiplex (MIMO-OFDM). This paper proposes a novel virtual channel detector that enables iterative MIMO receivers to achieve superior performance to the conventional receivers. Moreover, this paper proposes a novel signal estimation technique named as "extended maximum a posteriori probability (MAP) estimation" to select more reliable virtual channel. The proposed technique estimates the virtual channel with not only the a priori information on the virtual channels but also that on the real signals. The performance of the proposed detector with the extended MAP estimation is verified in a 6 x 2 MIMO OFDM system where the Turbo code is applied. The receiver with the proposed detector achieves much better performance than the conventional receivers. Actually, the proposed detector enables the MIMO receiver to achieve a gain of 3.0 dB at the BER of 10(-5), compared with conventional receivers with virtual channels, e.g., the soft input soft output (SISO) MAP detector with the same Turbo decoder. It is confirmed that the proposed receiver has by about one-fifth less complexity than the receiver with the SISO MAP MIMO detector.

    DOI: 10.1109/ICSPCS.2014.7021069

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  • Complexity Reduced Lattice-Reduction-Aided MIMO Receiver with Virtual Channel Detection Reviewed

    Shogo Yoshikawa, Satoshi Denno, Masahiro Morikura

    IEICE TRANSACTIONS ON COMMUNICATIONS   E96B ( 1 )   263 - 270   2013.1

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    This paper proposes a lattice-reduction-aided MIMO-OFDM receiver with virtual channels; the receiver enables an increase in the downlink transmission speed for a user where the number of transmit antennas is considerably higher than that of the receive antennas. However, the receiver has a higher computational complexity than conventional lattice-reduction-aided MIMO receivers. Accordingly, we also propose novel techniques to reduce the computational complexity for the lattice-reduction-aided MIMO receivers with virtual channels. The proposed MIMO receiver achieves superior performance in 10 x 2 MIMO-OFDM systems. Furthermore, the proposed techniques are shown to reduce the computational complexity to approximately 40% of the original configuration in the 10 x 2 MIMO-OFDM systems.

    DOI: 10.1587/transcom.E96.B.263

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  • Software Radio-Based Distributed Multi-User MIMO Testbed: Towards Green Wireless Communications Reviewed

    Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E96A ( 1 )   247 - 254   2013.1

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    The present paper introduces a prototype design and experimental results for a multi-user MIMO linear precoding system. A base station and two mobile stations are implemented by taking full advantage of the software-defined radio. The base station consists of general purpose signal analyzers and signal generators controlled by a personal computer. Universal software radio peripherals are used as mobile stations. Linear spatial precoding and a simple two-way channel estimation technique are adopted in this experimental system. In-lab and field transmission experiments are carried out, and the bit error rate performance is evaluated. The impact of the channel estimation error under average channel gain discrepancy between two mobile stations is analyzed through computer simulations. Channel estimation error is shown to have a greater influence on the mobile station with the greater average channel gain.

    DOI: 10.1587/transfun.E96.A.247

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  • Frequency Domain Imbalance Estimation in Heterodyne Multimode/Band Receivers with Baseband Automatic Gain Control Reviewed

    Satoshi Denno, Ke Liu, Tatsuo Furuno, Masahiro Morikura

    IEICE TRANSACTIONS ON COMMUNICATIONS   E96B ( 1 )   271 - 280   2013.1

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    This paper proposes a novel scheme called as "frequency domain imbalance estimation" that estimates the imbalance of the Hilbert transformer in heterodyne multimode/band receivers with baseband automatic gain control (AGC). The proposed scheme uses correlation matrices in the frequency domain. This enables the receivers to keep high transmission performance in spite of the imbalance of the analog Hilbert transformer, by offsetting the imbalance. Moreover, the baseband AGC relaxes the requirement of the baseband AID converter. The performance of imbalance estimation and imbalance cancellation is verified by computer simulation. As a result, it is shown that the proposed scheme not only estimates the imbalance of Hilbert transformer with extremely high precision, but also cancels the image-band interference such that it achieves the theoretical performance.

    DOI: 10.1587/transcom.E96.B.271

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  • Indoor Experiment of Multi-User MIMO User Selection Algorithm Based on Chordal Distance Reviewed

    Masato Taniguchi, Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    2013 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM)   3959 - 3964   2013

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    A transmission experiment of a multi-user MIMO system with user selection and linear spatial precoding is conducted and the results are reported. As a low-complexity user selection algorithm, the chordal distance-based user selection (CDUS) algorithm is employed. The testbed used in the experiment is implemented by taking full advantage of the software-defined radio. An amplify-and-forward-based simple channel estimation method is adopted. As a result of the experiment in a conference room, the CDUS algorithm improved both the power efficiency and the interference suppression accuracy compared to the round-robin user selection.

    DOI: 10.1109/GLOCOM.2013.6831692

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  • Iterative frequency offset estimation based on singular value decomposition

    Masataka Hasebe, Satoshi Denno, Shigeru Tomisato, Masaharu Hata

    ISPACS 2013 - 2013 International Symposium on Intelligent Signal Processing and Communication Systems   125 - 130   2013

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    This paper proposes an iterative frequency offset estimation based on singular value decomposition (SVD). The proposed technique achieves high resolution estimation of frequency offset even in the presence of strong co-channel and inter-symbol interference. Moreover, the proposed technique can estimate large frequency offset, e.g., ΔfT = 12.8 with high precision. The proposed technique comprises two new ideas. One is frequency offset estimation by using SVD and an adaptive filter. The other is iteration of the above frequency offset estimation followed by a frequency offset reduction. The iteration of the frequency offset estimation improves the estimation performance. In fact, it is evaluated by computer simulation that estimate the frequency offset normalized by a symbol duration, ΔfT = 12.8, in wireless sensor networks with direct sequence spread spectrum (DS-SS). © 2013 IEEE.

    DOI: 10.1109/ISPACS.2013.6704533

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  • A low complexity heterodyne multiband MIMO receiver with baseband automatic gain control Reviewed

    Tomoya Ohta, Satoshi Denno, Masahiro Morikura

    IEICE Transactions on Communications   E96-B ( 12 )   3124 - 3134   2013

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    This paper proposes a novel heterodyne multiband multiple-input multiple-output (MIMO) receiver with baseband automatic gain control (AGC) for cognitive radios. The proposed receiver uses heterodyne reception implemented with a wide-passband band-pass filter in the radio frequency (RF) stage to be able to receive signals in arbitrary frequency bands. Even when an RF Hilbert transformer is utilized in the receiver, image-band interference occurs due to the imperfection of the Hilbert transformer. In the receiver, analog baseband AGC is introduced to prevent the baseband signals exceeding the voltage reference of analogto- digital converters (ADCs). This paper proposes a novel technique to estimate the imperfection of the Hilbert transformer in the heterodyne multiband MIMO receiver with baseband AGC. The proposed technique estimates not only the imperfection of the Hilbert transformer but also the AGC gain ratio, and analog devices imperfection in the feedback loop, which enables to offset the imperfection of the Hilbert transformer. The performance of the proposed receiver is verified by using computer simulations. As a result, the required resolution of the ADC is 9 bits in the proposed receiver. Moreover, the proposed receiver has less computational complexity than that with the baseband interference cancellation unless a frequency band is changed every 9 packets or less. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.

    DOI: 10.1587/transcom.E96.B.3124

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  • A reduced-complexity heterodyne multiband MIMO receiver with estimation of analog devices imperfection in a baseband feedback loop Reviewed

    Tomoya Ohta, Satoshi Denno, Masahiro Morikura

    IEICE Transactions on Communications   E96-B ( 6 )   1540 - 1550   2013

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    This paper proposes a reduced-complexity multiband multiple-input multiple-output (MIMO) receiver that can be used in cognitive radios. The proposed receiver uses heterodyne reception implemented with a wide-passband band-pass filter in the radio frequency (RF) stage. When an RF Hilbert transformer is utilized in the receiver, image-band interference occurs because of the transformer's imperfections. Thus, the imperfection of the Hilbert transformer is corrected in the intermediate frequency (IF) stage to reduce the hardware complexity. First, the proposed receiver estimates the channel impulse response in the presence of the strong image-band interference signals. Next, the coefficients are calculated for the correction of the imperfection at the IF stage, and are fed back to the IF stage through a feedback loop. However, the imperfection caused by the digital-to-analog (D/A) converter and the baseband amplifier in the feedback loop corrupts the coefficients on the way back to the IF stage. Therefore, the proposed receiver corrects the imperfection of the analog devices in the feedback loop. The performance of the proposed receiver is verified by using computer simulations. The proposed receiver can maintain its performance even in the presence of strong image-band interference signals and imperfection of the analog devices in the feedback loop. In addition, this paper also reveals the condition for rapid convergence. Copyright © 2013 The Institute of Electronics.

    DOI: 10.1587/transcom.E96.B.1540

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  • Experimental Comparison of Linear Prediction Schemes for Multi-User MIMO Systems Reviewed

    Toshiki Tanaka, Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    2013 11TH INTERNATIONAL SYMPOSIUM ON MODELING & OPTIMIZATION IN MOBILE, AD HOC & WIRELESS NETWORKS (WIOPT)   95 - 100   2013

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    In a multi-user multiple-input multiple-output (MU-MIMO) system, zero-forcing precoding can completely eliminates inter-user interference when the perfect channel state information is available at the base station. However, in time-varying channels, the transmission performance of MU-MIMO systems is severely degraded due to inter-user interference. In this paper, channel prediction is employed for channel tracking, and in-lab experiments are carried out to confirm its performance. The bit error rate (BER) performance is measured and compared with the computer simulation results. Both in-lab experiments and the computer simulations show that channel prediction improves the BER performance.

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  • A Convolutional Coded XOR Physical Layer Network Coding with Unitary Precoding in Wireless Bidirectional Relay Networks Reviewed

    Satoshi Denno, Daisuke Umehara

    2013 7TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2013

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    Physical layer network coding is able to improve frequency utilization efficiency in bi-directional wireless communications via a relay. This paper proposes a novel error correction scheme for physical layer XOR network coding. The proposed scheme not only improves transmission performance but also to reduce complexity at the relay. The proposed scheme applies a unitary precoding to offset phase rotation in the channel by exploiting the reciprocity between channels in the uplink and the downlink in systems with time division duplex (TDD). Moreover, a novel complexity reduced maximum likelihood detection technique is applied in the proposed scheme. It is evaluated by computer simulation that the proposed scheme attains a gain of 8dB at BER=10(-5) compared with AF network coding in a system with the use of OFDM.

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  • Complexity Reduced Lattice-Reduction-Aided MIMO Receiver with Virtual Channel Detection Reviewed

    Shogo Yoshikawa, Satoshi Denno, Masahiro Morikura

    6TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS'2012)   E96-B   247 - 254   2012.12

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    The Lattice-reduction aided MIMO receiver with virtual channels has been proposed that can increase transmission speed for a user in downlinks. Although the proposed receiver achieves superior performance even when the number of receive antennas is much less than that of spatially multiplexed streams, however, the receiver has more computational complexity than conventional lattice reduction-aided MIMO receivers. Then, this paper proposes novel techniques to reduce computational complexity for lattice-reduction aided MIMO receivers with virtual channels. In fact, the proposed techniques are shown to reduce the computational complexity to about 40 % of the original configuration in 8 x 2 MIMO-OFDM systems. Even if the proposed techniques are applied, the MIMO receiver is also shown to achieve superior performance in 10x2 MIMO-OFDM systems.

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  • A Virtual Layered Successive Detector with Adaptive Transmit Signal Phase Rotation for QAM Reviewed

    DENNO Satoshi, IMAMURA Jun, MORIKURA Masahiro

    IEICE Trans. Commun.   95 ( 10 )   3232 - 3241   2012.10

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    This paper proposes a virtual layered successive detector with adaptive transmit signal phase rotation for quadrature amplitude modulation (QAM) that enables high speed communication even in downlinks of wireless communication systems. It is shown that the detection performance is degraded when the eigenvalue of a virtual channel becomes close to the power of the additive white Gaussian noise (AWGN). Therefore, adaptive transmit signal phase rotation is introduced for the detector to improve the transmission performance. For the transmit phase rotation, three techniques to search the rotation angles are proposed, which can reduce the feedback information from the receiver to the transmitter. Among the three proposed techniques, the technique called "iterative variable step step search" is shown to achieve the best performance. Actually, it is confirmed by computer simulation that the variable step search makes the detector attain about 17dB of a gain at the bit error rate (BER) of 10-5 in 4×2 multiple-input-multiple-output (MIMO) systems.

    DOI: 10.1587/transcom.E95.B.3232

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  • A Least Bit Error Rate Adaptive Array for MultiLevel Modulations Reviewed

    DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE Trans. Commun.   95 ( 1 )   69 - 76   2012.1

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    This paper proposes an adaptive algorithm for adaptive arrays that minimizes the bit error rate (BER) of the array output signals in radio communication systems with the use of multilevel modulation signals. In particular, amplitude phase shift keying (APSK) is used as one type of multilevel modulations in this paper. Simultaneous non-linear equations that are satisfied by the optimum weight vector of the proposed algorithm are derived and used for theoretical analyze of the performance of the adaptive array based on the proposed algorithm. As a result of the theoretical analysis, it can be shown that the proposed adaptive array improves the carrier to interference ratio of the array output signal without taking advantage of the nulls. Furthermore, it is confirmed that the result of the theoretical analysis agrees with that of computer simulation. When the number of the received antenna is less than that of the received signals, the adaptive array based on the proposed algorithm is verified to achieve much better performance then that based on the least mean square (LMS) algorithm.

    DOI: 10.1587/transcom.E95.B.69

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  • Field Experiments of Linearly Precoded Multi-User MIMO System at 5 GHz Band Reviewed

    Masato Taniguchi, Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    2012 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL)   2012

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    In this paper, implementation of a multi-user MIMO experimental system is presented. Linear spatial precoding and a simple two-way channel estimation technique are adopted in the experimental system. In-lab and field transmission experiments are carried out and the performance is evaluated. The impact of channel estimation error under average channel gain discrepancy between two mobile stations is analyzed by means of computer simulation. It is shown that channel estimation error has a greater influence on the mobile station with greater average channel gain.

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  • Partitioned Vector Quantization for MU-MIMO Downlink Broadcasting Reviewed

    Mirza Golam Kibria, Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    2012 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL)   2012

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    A practical and efficient vector quantization called partitioned vector quantization (P-VQ) based non-linear precoder for MIMO downlink broadcasting channels has been analyzed in this paper. P-VQ has been found to be an efficient way of reducing the memory requirements and search complexity in conventional VQ systems, especially for large MIMO. Simulation results reveal that P-VQ technique can enhance the overall quantization performance in terms of achieved capacity, bit error rate (BER) at a cost of reasonable additional complexity under certain feedback budgets. Tomlinson-Harashima precoding (THP), a power and complexity efficient precoding technique along with data dependent vector perturbation (VP) has been employed to meet the power constraint requirements of our system. Least-square (LS) channel estimation is performed at the user terminals to acquire their channel state information (CSI).

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  • A Virtual Successive Detection for Cooperative MU-MIMO Systems with Reduced CSI Reviewed

    Akihito Taya, Satoshi Denno, Koji Yamamoto, Masahiro Morikura, Daisuke Umehara, Hidekazu Murata, Susumu Yoshida

    2012 IEEE 75TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING)   1   1 - 5   2012

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    In this paper, we propose a receiver using the concept of a "virtual channel" and Turbo codes for multiuser multiple-input multiple-output (MU-MIMO) systems with cooperating transmitters. In order to reduce feedback information from receivers, a precoding method with reduced channel state information (CSI) is needed. Although signals interfere with each other in such a system, the proposed receiver enables high-speed transmission by detecting signals iteratively. In the proposed iterative scheme, soft information is exchanged between virtual channel detectors and Turbo decoders to improve the bit error rate (BER) performance. We evaluate the performance of the proposed receiver in systems with two transmitters, each equipped with four antennas, and two receivers, each equipped with two antennas. The results show that the proposed receiver can improve the system performance owing to the iteration scheme.

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  • Experimental Verification of PER Performance of STBC-based Multi-hop Cooperative Relaying Reviewed

    Makoto Miyagoshi, Hidekazu Murata, Susumu Yoshida, Koji Yamamoto, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    2012 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL)   2012

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    In this paper, the end-to-end packet error rate (PER) performance of a space-time block code (STBC) based multi-hop cooperative relaying system is discussed. This system consists of a source, a destination, and two STBC based cooperative relays in each hop. These relays decode their received packets and forward the packets only when no error is found. In this system, there are conditions where the end-to-end PER performance improves with the number of hops. The theoretical end-to-end PER performance of this system have been derived analytically. However, in real-world wireless systems, various practical issues, e. g., timing synchronization and imperfect channel estimation, have a large impact on the performance. To confirm the end-to-end PER performance of this system in actual setup, an in-lab experiment using a fading emulator and four transceivers is performed under Rayleigh fading environment. The experimental results clarify the PER performance of the STBC based multi-hop cooperative relaying system. In addition, the theoretical PER performance is also verified from the experimental results.

    DOI: 10.1109/VTCFall.2012.6399343

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  • A Reduced-Complexity Multiband MIMO Receiver with Estimation of Analog Devices Imperfection Reviewed

    Tomoya Ohta, Masahiro Morikura, Satoshi Denno

    2012 IEEE 75TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING)   2012

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    Cognitive radios are of interest because they are capable of high frequency utilization efficiency. Multiband multiple-input multiple-output (MIMO) receivers based on heterodyne reception have been proposed for use in cognitive radios. This paper proposes a reduced-complexity multiband MIMO receiver that can achieve high performance by correcting the imperfection of the Hilbert transformer in the intermediate frequency (IF) band. However, the imperfection of the analog devices in the feedback loop causes poor performance. Therefore, a scheme for correcting the imperfection of the analog devices is proposed.

    DOI: 10.1109/VETECS.2012.6239940

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  • A Successive Detector with Virtual Channel Detection for Cooperative Multiuser MIMO Systems Reviewed

    田野 哲

    Proceedings of the IEEE VTS Asia Pacific Wireless Communications symposium   1   1 - 5   2012

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  • Complexity Reduction Methods For Virtual Layered Space Time Receivers

    OHNISHI Ryota, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE Trans. Commun. (Japanese Edition), B   94 ( 12 )   1585 - 1594   2011.12

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  • A Virtual Layered Space-Frequency Receiver Architecture with Iterative Decoding Reviewed

    Jun Imamura, Satoshi Denno, Daisuke Umehara, Masahiro Morikura

    IEICE TRANSACTIONS ON COMMUNICATIONS   E94B ( 7 )   1994 - 2002   2011.7

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    In this paper, a novel receiver architecture is proposed for multiple-input-multiple-output (MIMO) systems; the proposed architecture helps achieve superior performance in multipath fading channels when the number of layered streams exceeds the number of receiving antennas. In this architecture, the concept of "virtual channel" is adopted to attain diversity gain even when successive detection is applied for reducing computational complexity, while orthogonal frequency division multiplexing (OFDM) is employed to combat multipath fading. Actually, successive detection is carried out in all possible virtual channels, and the virtual channel with the minimum error probability is detected with the assistance of the maximum a-posteriori (MAP) decoder in the architecture. In addition, soft input and soft output (SISO) iterative detection is introduced in the virtual channel estimation scheme. The performance of the proposed architecture is verified by computer simulations. This architecture can be implemented with lesser complexity than that in maximum likelihood detection (MLD), but the gain in the former case exceeds that in the latter by 4.5 dB at the BER of 10(-3) for 4 x 2 MIMO-OFDM.

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  • Theoretical Performance Analysis of an Image-Band Interference Canceller with Deterministic Imbalance Estimation Reviewed

    Satoshi Denno, Ke Liu, Tatsuo Furuno, Masahiro Morikura

    IEICE TRANSACTIONS ON COMMUNICATIONS   E94B ( 4 )   968 - 977   2011.4

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    It is known that a heterodyne multimode receiver implemented with a single RF (Radio Frequency) receiver suffers from image-band interference due to imbalance, i.e. the phase error and the gain imbalance of the RF Hilbert transformer. The blind image band interference canceler with deterministic imbalance estimation that has been proposed mitigates the image-band interference. This performance of the image-band interference canceler is analyzed theoretically in this paper. As a result, it is revealed that estimation accuracy of the deterministic imbalance estimation is improved slightly as the imbalance becomes greater. In addition, it is also shown that the deterministic estimation achieves better performance as the power of image-band interference increases. The performance is confirmed by computer simulation.

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  • Performance analysis of slotted ALOHA and network coding for single-relay multi-user wireless networks Reviewed

    Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    AD HOC NETWORKS   9 ( 2 )   164 - 179   2011.3

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    Deployment of wireless relay nodes can enhance system capacity, extend wireless service coverage, and reduce energy consumption in wireless networks. Network coding enables us to mix two or more packets into a single coded packet at relay nodes and improve performances in wireless relay networks. In this paper, we succeed in developing analytical models of the throughput and delay on slotted ALOHA (S-ALOHA) and S-ALOHA with network coding (S-ALOHA/NC) for single-relay multi-user wireless networks with bidirectional data flows. The analytical models involve effects of queue saturation and unsaturation at the relay node. The throughput and delay for each user node can be extracted from the total throughput and delay by using the analytical models. One can formulate various optimization problems on traffic control in order to maximize the throughput, minimize the delay, or achieve fairness of the throughput or the delay. In particular, we clarify that the total throughput is enhanced in the S-ALOHA/NC protocol on condition that the transmission probability at the relay node is set at the value on the boundary between queue saturation and unsaturation. Our analysis provides achievable regions in throughput on two directional data flows at the relay node for both the S-ALOHA and S-ALOHA/NC protocols. As a result, we show that the achievable region in throughput can be enhanced by using network coding and traffic control. (C) 2010 Elsevier B.V. All rights reserved.

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  • Multiband MIMO-MMSE Receiver and Performance Improvement against Imperfection of Analog Devices

    TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    The IEICE transactions on communications B   94 ( 2 )   234 - 244   2011.2

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  • Sensor Collaborative Beam Forming with Low-Complexity Signal Processing

    NAKANO Junjiro, KOMADA Yoshiki, TOMISATO Shigeru, DENNO Satoshi, HATA Masaharu

    The IEICE transactions on communications B   94 ( 2 )   137 - 146   2011.2

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  • A virtual layered space-frequency receiver for multiuser MIMO-OFDM systems Reviewed

    Akihito Taya, Satoshi Denno, Daisuke Umehara, Masahiro Morikura, Hidekazu Murata, Koji Yamamoto, Susumu Yoshida

    IEEE Vehicular Technology Conference   1   1 - 5   2011

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    In this paper, we propose a virtual layered spacefrequency receiver with an ordered successive detector for multiuser multiple-input multiple-output (MU-MIMO) systems where multiple transmitters cooperate with one another. The proposed receiver enables high-speed transmission in the systems even if the transmitters know only partial channel state information (CSI). Actually, the receiver shows such superior performance when the concept of "virtual channel" is applied to cooperative MU-MIMO systems. Moreover, we propose an iterative detection scheme for the receiver
    in this scheme, some signals from the Viterbi decoder are fed back to the ordered successive detector. The proposed iterative scheme helps improve the transmission speed when the number of cooperating transmitters is increased. We evaluate the performance of MIMO systems in which the transmitters have four antennas each and two users have two antennas. The receiver can double the transmission speed at the cost of 3 dB in E b/N 0 at a BER of 10 -4. Furthermore, the receiver can triple the transmission speed at the cost of 7 dB in E b/N 0 at a BER of 10 -4. When the system has three transmitters, we observe an error floor. However, the proposed iterative method can suppress the error to a value below BER = 10 -7. © 2011 IEEE.

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  • Experimental results of two-way channel estimation technique for coordinated multi-point transmission Reviewed

    Hidekazu Murata, Koji Yamamoto, Susumu Yoshida, Satoshi Denno, Daisuke Umehara, Masahiro Morikura

    ICICS 2011 - 8th International Conference on Information, Communications and Signal Processing   2011

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    This paper presents an experimental setup of a multi-user MIMO linear precoding system. The experimental system consists of a base station with two antennas and two mobile stations. In this system, a two-way channel estimation technique is implemented in which mobile stations just send back the received signals along with their training sequences. In this technique, the base station can obtain the channel coefficients of both the uplink and the downlink. This two-way multiple-input multiple-output channel estimation technique has been proposed and mathematically analyzed in literature. Computer simulation results have been reported to identify the required hardware specifications for amplify and forward operation in mobile stations by examining the bit error rate performance. However, hardware implementation feasibility of this technique is not studied yet. In this paper, feasibility of a multi-user MIMO linear precoding system using two-way channel estimation technique is shown by in-lab experiments. © 2011 IEEE.

    DOI: 10.1109/ICICS.2011.6173520

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  • A Virtual Layered Space-Frequency Receiver for Multiuser MIMO-OFDM systems Reviewed

    Akihito Taya, Satoshi Denno, Daisuke Umehara, Masahiro Morikura, Hidekazu Murata, Koji Yamamoto, Susumu Yoshida

    2011 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL)   2011

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    In this paper, we propose a virtual layered space-frequency receiver with an ordered successive detector for multiuser multiple-input multiple-output (MU-MIMO) systems where multiple transmitters cooperate with one another. The proposed receiver enables high-speed transmission in the systems even if the transmitters know only partial channel state information (CSI). Actually, the receiver shows such superior performance when the concept of "virtual channel" is applied to cooperative MU-MIMO systems. Moreover, we propose an iterative detection scheme for the receiver; in this scheme, some signals from the Viterbi decoder are fed back to the ordered successive detector. The proposed iterative scheme helps improve the transmission speed when the number of cooperating transmitters is increased. We evaluate the performance of MIMO systems in which the transmitters have four antennas each and two users have two antennas. The receiver can double the transmission speed at the cost of 3 dB in E-b/N-0 at a BER of 10(-4). Furthermore, the receiver can triple the transmission speed at the cost of 7 dB in E-b/N-0 at a BER of 10(-4). When the system has three transmitters, we observe an error floor. However, the proposed iterative method can suppress the error to a value below BER = 10(-7).

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  • Distributed transmit power control for distributed antenna systems using MRC Reviewed

    Shigemasa Kumagawa, Koji Yamamoto, Hidekazu Murata, Susumu Yoshida, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    ICICS 2011 - 8th International Conference on Information, Communications and Signal Processing   2011

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    Distributed antenna systems (DAS) are studied in order to improve the coverage area of wireless communication systems under transmit power constraint. In order to reduce the computational complexly among clusters, in DAS, it is imperative to control the inter-cluster interference in a decentralized way. In this paper, a distributed power control among clusters for single-user DAS based on Foschini-Miljanic's algorithm is proposed. The objective of the proposed algorithm is to mitigate the interference among clusters and satisfy the desired SINR at each mobile station (MS). In the algorithm, first signal power after MRC at MS in a cluster is calculated, then the transmit power of the BSAs in the corresponding cluster is updated according to the predefined transmit power ratio. In addition, the convergence condition is derived, and the performance of the proposed algorithm is evaluated through computer simulations. © 2011 IEEE.

    DOI: 10.1109/ICICS.2011.6173525

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  • A Lattice-Reduction-Aided MIMO Receiver with Virtual Channel Detection Reviewed

    田野 哲

    Proceedings of 5th international conference on signal processing and communication systems   1   1 - 5   2011

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  • A Virtual Layered Signal Processing Receiver for 16-QAM with Transmit Signal Rotation Reviewed

    Satoshi Denno, Jun Imamura, Masahiro Morikura

    5TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS, ICSPCS'2011   1   1 - 5   2011

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    This paper proposes a novel receiver, named as "a virtual layered signal processing receiver for 16 QAM" for high speed signal transmission in wireless communication systems. In the proposed receiver, the ordered successive detection is applied with the concept of virtual channel, which enables to detect layered streams even when the number of the layered streams is more than that of the received antennas. Therefore, the proposed receiver can increase the transmission speed of the down link in which a receiver is implemented in small terminals with a small number of antennas. The proposed receiver unfortunately degrades compared with the maximum likelihood estimation (MLD), however, when the channel matrix of the virtual channel is not full rank. To avoid the performance degradation, this paper proposes a technique that transmit signal constellation is phase-rotated with information fed back from the receiver. Actually, it is confirmed by computer simulation that only 1-bit of feed back information is enough to achieve the upper bound in BER performance in a 2 x 1 MIMO system.

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  • Enhancement of CSMA/CA and Network Coding in Single-Relay Multi-User Wireless Networks Reviewed

    HUANG Chun-Hsiang, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE Trans. Commun.   93 ( 12 )   3371 - 3380   2010.12

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    Network coding is a promising technique for improving system performance in wireless multihop networks. In this paper, the throughput and fairness in single-relay multi-user wireless networks are evaluated. The carrier sense multiple access with collision avoidance (CSMA/CA) protocol and network coding are used in the medium access control (MAC) sublayer in such networks. The fairness of wireless medium access among stations (STAs), the access point (AP), and the relay station (RS) results in asymmetric bidirectional flows via the RS; as a result the wireless throughput decreases substantially. To overcome this problem, an autonomous optimization of minimum contention window size is developed for CSMA/CA and network coding to assign appropriate transmission opportunities to both the AP and RS. By optimizing the minimum contention window size according to the number of STAs, the wireless throughput in single-relay multi-user networks can be improved and the fairness between bidirectional flows via the RS can be achieved. Numerical analysis and computer simulations enable us to evaluate the performances of CSMA/CA and network coding in single-relay multi-user wireless networks.

    DOI: 10.1587/transcom.E93.B.3371

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  • Enhancement of IEEE 802.11 and Network Coding for Single-Relay Multi-User Wireless Networks Reviewed

    Daisuke Umehara, Chun-Hsiang Huang, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    2010 4TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2010.12

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    Network coding is a promising technique for improving system performance in wireless multihop networks. In this paper, the throughput and fairness in single-relay multiuser wireless networks are evaluated. The carrier sense multiple access with collision avoidance (CSMA/CA) protocol and network coding are used in the medium access control (MAC) sublayer in such networks. The fairness of wireless medium access among stations (STAs), the access point (AP), and the relay station (RS) results in asymmetric bidirectional flows via the RS; as a result the wireless throughput decreases substantially. To overcome this problem, an autonomous optimization of minimum contention window size is developed for CSMA/CA and network coding to assign appropriate transmission opportunities to both the AP and RS. By optimizing the minimum contention window size according to the number of STAs, the wireless throughput in single-relay multi-user networks can be improved and the fairness between bidirectional flows via the RS can be achieved. Numerical analysis and computer simulations enable us to evaluate the performances of CSMA/CA and network coding in single-relay multi-user wireless networks.

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  • Performance Analysis of Adaptive Arrays Based on Least Bit Error Rate Algorithm

    DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    The IEICE transactions on communications B   93 ( 9 )   1249 - 1258   2010.9

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  • Adaptive Multi-Band Array for Cancelling Co-channel Interference and Image-Band Interference

    TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    The IEICE transactions on communications B   93 ( 2 )   269 - 277   2010.2

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  • Throughput Analysis of Two-Hop Wireless CSMA Network Coding Reviewed

    Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    2010 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS   2010

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    This paper considers two-hop wireless systems employing network coding and a carrier sense multiple access (CSMA) protocol. Network coding is a recent and highly regarded technology for the capacity enhancement of multiple unicast and multisource multicast networks. The two-hop wireless CSMA systems are often involved with the hidden node problem, but the impact of the hidden nodes on network coding has not been analyzed in theory. This paper provides explicit expressions of the throughput for single-relay two-hop wireless CSMA systems both without and with network coding. The throughput can be obtained from these expressions for given system parameters even when end nodes via the relay node are hidden each other. Furthermore it is shown that the transmit probability of the relay node is a design parameter that is crucial for maximizing the achievable throughput for CSMA systems with network coding. It is clarified that the throughput for CSMA systems can be enhanced as compared with that for slotted ALOHA systems in case of non-hidden end nodes whereas it deteriorates considerably in case of hidden end nodes.

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  • Coded Packet Immediate Access for Contention-Based Wireless Relay Networks Reviewed

    Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    2010 4TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2010

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    This paper proposes a medium access control (MAC) protocol with network coding on relay nodes for contention-based multihop wireless relay networks. The proposed protocol is called coded packet priority access (CPPA) protocol in which coded packets have higher transmission opportunity than non-coded native packets at relay nodes. In this paper, the performance of coded packet immediate access (CPIA) protocols, which are a subclass of CPPA protocols, is evaluated for single-relay bidirectional symmetric traffic and upper and lower bounds of analytical throughput are derived for any given node traffic. It is shown that the lower bound approximates to the throughput obtained from computer simulations with high accuracy. The conventional slotted ALOHA protocol with network coding (SALOHA/NC) is required to adapt the transmission probability of relay node to a rational function of node traffic so as to maximize the throughput whereas the CPIA protocol achieves the maximal throughput only if the relay node transmits no native packets. Furthermore it is clarified that the CPIA protocol is superior to the S-ALOHA/NC protocol in delay for given retransmission probabilities of user nodes.

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  • Achievable Region in Slotted ALOHA Throughput for One-Relay Two-Hop Wireless Network Coding Reviewed

    Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    AD HOC NETWORKS   28   376 - +   2010

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    This paper presents achievable regions in slotted ALOHA throughput both without and with network coding for one-relay two-hop wireless networks between two end node groups. In this paper, there are no restrictions on the total traffic and the number of end nodes per group. It follows that the relay node will be generally involved with asymmetric bidirectional traffic. This paper derives closed-form expressions of the throughput and packet delay per group both without and with network coding from a theoretical perspective regardless of whether the buffer on the relay node is saturated or not. Furthermore, we show that the maximum throughput per group with network coding can be achieved at the boundary of the relay buffer saturation and unsaturation which is expressed as the solution of a polynomial equation in two group node traffics. As a result, we clarify the enhancement of the achievable region in slotted ALOHA throughput by applying network coding.

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  • An Iterative Parallel OFDM Demodulation for Fast Time-Varying Fading Channels Reviewed

    Satoshi Denno, Ippei Aoki, Daisuke Umehara, Masahiro Morikura

    2010 4TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   1   2010

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    This paper proposes a novel OFDM demodulation scheme, which achieves superior performance even in fast time-varying multipath fading channels where the conventional OFDM demodulator degrades seriously because of time selectivity in the channel. The proposed scheme consists of several equalizers which equalize received signals with channel impulse responses at different time instants in parallel. A selector following these equalizers selects the most reliable signal from the outputs of these equalizers. Furthermore, the proposed demodulator employs an inter-carrier interference (ICI) canceler to mitigate degradation due to the time selectivity in the channels. In this paper, two novel ICI cancelers are proposed. Finally, the performance of the proposed OFDM demodulators are verified by means of computer simulation.

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  • Throughput analysis of two-hop wireless CSMA network coding Reviewed

    Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    IEEE International Conference on Communications   2010

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    This paper considers two-hop wireless systems employing network coding and a carrier sense multiple access (CSMA) protocol. Network coding is a recent and highly regarded technology for the capacity enhancement of multiple unicast and multisource multicast networks. The two-hop wireless CSMA systems are often involved with the hidden node problem, but the impact of the hidden nodes on network coding has not been analyzed in theory. This paper provides explicit expressions of the throughput for single-relay two-hop wireless CSMA systems both without and with network coding. The throughput can be obtained from these expressions for given system parameters even when end nodes via the relay node are hidden each other. Furthermore it is shown that the transmit probability of the relay node is a design parameter that is crucial for maximizing the achievable throughput for CSMA systems with network coding. It is clarified that the throughput for CSMA systems can be enhanced as compared with that for slotted ALOHA systems in case of non-hidden end nodes whereas it deteriorates considerably in case of hidden end nodes. ©2010 IEEE.

    DOI: 10.1109/ICC.2010.5502114

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  • Iterative Decoding on Soft Information for Virtual Layered Space-Frequency Receivers Reviewed

    Jun Imamura, Satoshi Denno, Daisuke Umehara, Masahiro Morikura

    2010 4TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   2010

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    In this paper, we propose an iteration scheme for the virtual layered space frequency communication architecture. The architecture enables the decoding of the transmitted orthogonal frequency division multiplexing (OFDM)-QPSK signals even if the number of spatial multiplexed layers is twice that of receiving antennas over multipath fading channels. In the proposed iteration scheme, the MAP decoder and detector exchange soft information on the virtual channel. Using the soft informations, the architecture achieves much higher performance with lower computational complexity compared to maximum likelihood detection (MLD) even when the punctured code is used. Consequently, a gain of 4.5 dB can be achieved at a BER of 10-3 compared to that achieved with the MLD in the 4 x 2 MIMO-OFDM system when the rate 3/4 punctured code is used. The performance of the proposed architecture is verified by carrying out computer simulations.

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  • Successive Receiver Architecture with Virtual Channel for Layered Space Time Communications

    MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    The IEICE transactions on communications B   92 ( 10 )   1677 - 1686   2009.10

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  • Blind Image-Band Interference Canceller Based on CM (Constant Modulus) Criteria for Multimode Receivers

    DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE Trans. Commun.   92 ( 9 )   2903 - 2914   2009.9

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    This paper proposes a blind image-band interference canceller that enables heterodyne receivers with only a single receiver chain to demodulate signals in any frequency band. In this paper, such a receiver is called "multimode/multiband heterodyne receiver." If multimode/multiband receivers are desired to receive signals with carrier frequency ranging from several MHz to GHz, then, such receivers are not allowed to have a narrow band RF-BPF (Radio Frequency Band Pass Filter) at the RF front end. However, although heterodyne receivers have been applied to wireless systems due to their high performance, it is known that without an RF-BPF heterodyne receivers suffer from severe image-band interference. Therefore, a blind image-band interference canceller is proposed in this paper to mitigate the image-band interference. Moreover, a novel algorithm based on the CM (Constant Modulus) criterion is proposed to carry out the cancellation. Performance of the blind image-band interference canceller is theoretically analyzed and the performance of the proposed canceller is verified by computer simulation. As a result, it is shown that the blind image-band interference canceller achieves superior performance even in the presence of strong image-band interference, for example, CIR=-40dB. In summary, the proposed canceller makes it possible for the receiver with the single receiver chain to achieve multimode/multiband communications with high quality.

    DOI: 10.1587/transcom.E92.B.2903

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  • Parallel FFT Equalization for Fast Fading Channels

    HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    The IEICE transactions on communications B   92 ( 7 )   1174 - 1184   2009.7

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  • Wireless Network Coding in Slotted ALOHA with Two-Hop Unbalanced Traffic Reviewed

    Daisuke Umehara, Tomoya Hirano, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

    IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS   27 ( 5 )   647 - 661   2009.6

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    This paper deals with two representative unbalanced traffic cases for two-hop wireless relay access systems employing network coding and a slotted ALOHA protocol. Network coding is a recent and highly regarded technology for capacity enhancement with multiple unicast and multisource multicast networks. We have analyzed the performance of network coding on a two-hop wireless relay access system employing the slotted ALOHA under a balanced bidirectional traffic. The relay nodes will generally undergo this unbalanced multidirectional traffic but the impact of this unbalanced traffic on network coding has not been analyzed. This paper provides closed-form expressions for the throughput and packet delay for two-hop unbalanced bidirectional traffic cases both with and without network coding even if the buffers on nodes are unsaturated. The analytical results are mainly derived by solving queueing systems for the buffer behavior at the relay node. The results show that the transmission probability of the relay node is a design parameter that is crucial to maximizing the achievable throughput of wireless network coding in slotted ALOHA on two-hop unbalanced traffic cases. Furthermore, we show that the throughput is enhanced even if the traffic at the relay node is unbalanced.

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  • Influences of periodically switching channels synchronized with power frequency on PLC equipment Reviewed

    Daisuke Umehara, Taro Hayasaki, Satoshi Denno, Morikura Masahiro

    Journal of Communications   4 ( 2 )   108 - 118   2009

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    The regulation on power line communication (PLC) has been eased in Japan, and the frequency band between 2 and 30 MHz can be used for in-home PLC. Several different types of commercial PLC equipment are available in the market. Almost all of them include PLC adapters that interconvert Ethernet signals and power line signals. An in-home network can easily be constructed by using these PLC adapters because there are many power outlets in every room. However, there are various factors that tend to destabilize the communication among PLC adapters. These factors involve time-varying channel response and noise characteristics, which are both synchronized with the power frequency. In particular, it has been observed that the noise in a power line varies more significantly than the channel response. Therefore, many PLC adapters contain certain features to mitigate the time-varying noise in a power line. We show a number of examples of more significant variations in the channel response synchronized with the power frequency due to the switching regulators used. This paper deals with such a time-varying channel response synchronized with the power frequency. We show that the performance of the PLC adapters suffers due the time-varying channel response and analyze its influences on the PLC adapters. © 2009 Academy Publisher.

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  • A Simulator of Periodically Switching Channels for Power Line Communications Reviewed

    Taro Hayasaki, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    ACCESS NETS   6   162 - 175   2009

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    An indoor power line is one of the most attractive media for in-home networks. However, there are many technical problems for achieving in-home power line communication (PLC) with high rate and high reliability. One of such problem is the degradation in the performance of the in-home PLC caused by periodically time-varying channel responses, particularly when connecting the switching power supply equipment. We present a measurement method for power line channel responses and reveal the switching of the channel responses synchronized with power-frequency voltage when connecting switching power supply equipment in sending or receiving outlets. In this paper, we term them periodically switching channel responses. The performance of PLC adapters is seriously affected by the periodically switching channel responses. Therefore, we provide a modeling of the periodically switching channel responses by using finite impulse response (FIR) filters with a shared channel memory and construct a simulator for in-home power line channels including the periodically switching channel responses in order to evaluate the various communication systems through the power line. We present the validity of the proposed simulator through the performance evaluation of OFDM/64QAM over periodically switching channels with additive white Gaussian noise. Furthermore, we evaluate the influence of the periodically switching channel responses on the communication quality of a time-invariant modulation scheme by using the proposed simulator.

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  • A Virtual Layered Space-Frequency Communication Architecture with Iterative Decoding Reviewed

    Jun Imamura, Satoshi Denno, Daisuke Umehara, Masahiro Morikura

    GLOBECOM 2009 - 2009 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, VOLS 1-8   6339 - 6344   2009

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    In this study, we develop a virtual layered space-frequency communication architecture. This architecture enables the decoding of transmitted OFDM (Orthogonal Frequency Division Multiplexing)-QPSK signals even if the number of antennas at the transmitter is twice the number of antennas at the receiver over multipath fading channels. Furthermore, we propose two detection schemes called "hard replica" and "soft replica." In addition, in order to improve the performance of this architecture, we propose an iteration in which the receiver decodes the detected signals; through such iterations, this architecture can obtain path diversity and achieve high performance. When the transmitter has four antennas and receiver has two antennas, the proposed architecture achieves HER of 8 x 10(-4) using the soft replica at E-b/N-0 = 15 dB. Furthermore, by performing more iterations, it provides additional gains of 3 dB. The performance of the proposed architecture is verified using computer simulations.

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  • A Virtual Layered Space Time Receiver with Maximum Likelihood Channel Detection

    DENNO S.

    Proc. IEEE VTC' 09 Spring, Barcelona, April   2009

  • Throughput Analysis of Wireless Relay Slotted ALOHA Systems with Network Coding Reviewed

    Daisuke Umehara, Tomoya Hirano, Satoshi Denno, Masahiro Morikura

    GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE   2008.12

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    This paper deals with a simple but essential two-hop wireless relay network employing network coding and a slotted ALOHA protocol. Network coding is a recent and highly regarded technology for capacity enhancement on multiple unicast and multisource multicast networks. However, the performance of network coding on wireless relay networks employing random access protocols has not been analyzed. This paper provides closed-form expressions for the throughput and delay on two-hop wireless relay networks both with and without network coding from a theoretical perspective of the slotted ALOHA protocol. The analytical results are derived by solving queueing systems for the buffer activity at the relay node. The results show that the transmission probability of the relay node is a design parameter that is crucial to maximizing the achievable throughput of slotted ALOHA with network coding on a twohop wireless relay network. Furthermore, this paper clarifies that the throughput is enhanced by controlling the transmission probability of the relay node such that it has considerable opportunity for network coding.

    DOI: 10.1109/GLOCOM.2008.ECP.953

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  • A Deterministic Cancellation Matrix Estimation Scheme in Heterodyne Multimode Receivers

    HAYASHI Daisuke, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    The IEICE transactions on communications B   91 ( 11 )   1440 - 1449   2008.11

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  • Heterodyne Multimode/Multiband Receivers with Dual Frequency Conversion

    HAYASHI Daisuke, FURUNO Tatsuo, DENNO Satoshi

    The IEICE transactions on communications B   91 ( 5 )   566 - 574   2008.5

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  • The influence of time-varying channels synchronized with commercial power supply on PLC equipments Reviewed

    Daisuke Umehara, Taro Hayasaki, Satoshi Denno, Masahiro Morikura

    IEEE ISPLC: 2008 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   30 - 35   2008

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    The regulation on power line communication (PLC) has been eased in Japan and the frequency band between 2 and 30 MHz can be exploited for in-home PLC. Several commercial PLC equipments are available in the market. Almost all PLC equipments take on a form of PLC adapters interconverting Ethernet signals and power line signals. We can construct in-home network by these PLC adapters easily because there are many power outlets in every room. However there are various factors destabilizing the communication among PLC adapters. These factors involve time-varying channel response and noise characteristics which are synchronized with commercial power supply. In particular, it has been seen that the noise on power line has significant variations rather than the channel response. Therefore, many PLC adapters are taking some measures to mitigate the time-varying noise on power line. On the other hand, we show a number of examples of more significant variations of the channel response synchronized with power supply due to some kinds of switching regulators. In this paper, we deal with such the time-varying channel response synchronized with commercial power supply. We show that the PLC adapters suffer from the time-varying channel response and analyze its influence on the PLC adapters.

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  • An Initial Acquisition Method for Channel Synchronization on In-home Power Line Communications Reviewed

    Keita Watanabe, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    ISPLC: 2009 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   137 - 142   2008

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    In this paper, we propose an initial acuisition method for channel synchronization on in-home broadband power line communication (PLC). It has been considered that the time fluctuation in the transfer function has been smaller than that in the noise on the in-home broadband PLC. However, we have observed that the extensively and rapidly time fluctuation across the whole frequency band appears in the in-home PLC at the half of power cycle intervals while connecting some switching power supply devices. Such largely and quickly, time fluctuation makes the extensive degradation in performance of in-home PLC devices. Therefore, we should estimate the timing of time fluctuation and synchronize the in-home PLC systems with the estimated time fluctuation. We evaluate the performance of the proposed initial acquisition method under impulsive noise environments and investigate its feasibility for the real in-home PLC.

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  • Power Saving Effect of Sensor Collaborative Beamforming for Wireless Ubiquitous Network Systems

    Sousuke Tokunaga, Yoshihisa Kawakami, Kenichi Hashimoto, Shigeru Tomisato, Satoshi Denno, Masaharu Hata

    2008 14TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, (APCC), VOLS 1 AND 2   301 - +   2008

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    This paper evaluates transmission performance and power-saving effect of the collaborative beamforming for wireless ubiquitous network systems. The evaluation of power-saving includes the power consumption for signal transmission to collaborative sensors in beamforming. The simulation result shows that the total power consumption of the beamforming with 3 collaborative sensors can be decreased to about 1/2 compared with that of a transmitting sensor without the beamforming in free-space propagation channels. In typical mobile propagation channels with shadowing, the total power consumption of the beamforming by using 3 collaborative sensors can be reduced to 1/7 of that without the beamforming. The above results confirm that the collaborative beamforming can be achieve lower power consumption, and greatly contributes to realize low-power transmission in wireless sensor network systems.

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  • A Bit-Loaded OFDMA for In-home Power Line Communications Reviewed

    Taro Hayasaki, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    ISPLC: 2009 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   171 - 176   2008

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    The in-home broadband power line communication (PLC) is drawing attention to us lately. The broadband PLC has regulation issues for the coexistence with shortwave wireless systems. Therefore, orthogonal frequency division multiplexing (OFDM) is adopted for the broadband PLC. On the other hand the power line channels suffer from frequency selective fading. It is effective to load appropriate bits on each subcarrier in the OFDM for PLC. In this paper, we propose a bit loading algorithm that maximizes the bit rate by optimizing not only the bit quantity on each subcarrier but also the whole code rate of the forward error correction (FEC) code subject to constraints on the total bit error rate (BER) and power on each subcarrier. Furthermore, we investigate orthogonal frequency division multiple access (OFDMA) as a multiple access scheme on the in-home power line networks. We show that the proposed OFDMA scheme is superior to a time division multiple access (TDMA) scheme from the viewpoint of throughput by computer simulations.

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  • A fast bit loading algorithm synchronized with commercial power supply for in-home PLC systems Reviewed

    Shinya Honda, Daisuke Umehara, Taro Hayasaki, Satoshi Denno, Masahiro Morikura

    IEEE ISPLC: 2008 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   336 - 341   2008

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    In-home PLC (Power Line Communication) is one of the most attractive in-home networkings. However, there are a lot of technical issues for the realization of PLC with high rate and high reliability. These issues include the influence of frequency selective and linear periodically time-variant (LPTV) channel synchronized with commercial power supply. In particular, we show that some kind of switching power devices impact deep and deterministic time selectivity for power line channels. The combination of OFDM (Orthogonal Frequency Division Multiplexing) and bit loading algorithm is a powerful tool to increase the bit rate or reliability for quasi-static frequency selective channels including power line channels. However, a quick response will be required for the execution of bit loading algorithm since power line channels are synchronized with commercial power supply. In this paper, we propose a fast bit loading algorithm based on the fractional knapsack algorithm to enhance the bit rate under the condition that the transmitted power is constant. Furthermore, we evaluate the achievable bit rate of the proposed algorithm for the SNR over a power line channel and compare it with the achievable bit rate based on water filling theory.

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  • Performance evaluation of CSK/PAM system using optimized real-valued sequence Reviewed

    Daisuke Ueyama, Daisuke Umehara, Satoshi Denno

    2007 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   28 - +   2007

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    We propose applying pulse amplitude modulated code shift keying (CSK/PAM) to indoor power line communication (PLC) for the high-speed data transmission at the low electromagnetic wave leakage. However, CSK/PAM system using conventional binary sequence, for example Gold sequence and M sequence, has error floor for real power line channels even with rake receiver because of the poor properties of odd auto and cross-correlation. Therefore, we propose extending binary sequence to real-valued sequence and we optimize performance in real-valued sequence by minimizing the even and odd, autoand cross-correlation values. We show that the CSK/PAM system using the optimized real-valued sequence can achieve better BER (Bit Error Rate) performance as compared with that using Gold sequence by computer simulation.

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  • Performance evaluation of wavelet OFDM using ASCET Reviewed

    Keita Izumi, Daisuke Umehara, Satoshi Denno

    2007 IEEE INTERNATIONAL SYMPOSIUM ON POWER LINE COMMUNICATIONS AND ITS APPLICATIONS   245 - +   2007

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    Power line communication (PLC) is one of the most attractive communication methods for in-home networks. However, the emissions of unwanted electric waves from PLC system cause harmful interference to other radio communication systems with the same frequency band. Wavelet OFDM (Orthogonal Frequency Division Multiplexing) is expected to be an efficient modulation for PLC because it can make steep and deep notch for any frequency band in the transmit signal power spectrum. However, wavelet OFDM cannot implement the equalization by guard interval (GI) like OFDM and causes performance degradation in multipath channels including power line channels. In this paper, we apply ASCET (Adaptive Sine modulated / Cosine modulated filter bank Equalizer for Transmultiplexers) to wavelet OFDM and evaluate its performance over a multipath power line channel. In particular, we propose an estimation scheme of equalizer coefficients for ASCET that the required preamble becomes short. We compare the performance of OFDM with GI to that of wavelet OFDM with ASCET over the multipath power line channel by computer simulations. As a result, we show that the proposed scheme can achieve the approximately equivalent performance of OFDM with GI by using the shorter preamble as compared to the original scheme.

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  • A decoding for low density parity check codes over impulsive noise channels Reviewed

    H Nakagawa, D Umehara, S Denno, Y Morihiro

    2005 International Symposium on Power Line Communications and Its Applications   85 - 89   2005

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    Power line channel often suffers from impulsive interference generated by electrical appliances. Therefore, power line communication makes degradation due to such impulsive interference. We introduce Middleton's Class A noise model into a statistical model of impulsive noise environment.
    In this paper, we apply LDPC (Low Density Parity Check) codes and sum-product decoding to additive white Class A noise (AWAN) channels. We propose a sum-product decoding which is suitable for AWAN channels. In addition, we show the BER (Bit Error Rate) performance of the proposed sum-product decoding in Class A noise environment by computer simulation.

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  • <大学の研究・動向> 衛星通信アクセス系における大容量データ伝送実験

    森広 芳照, 田野 哲, 梅原 大祐

    Cue : 京都大学電気関係教室技術情報誌   14   2 - 6   2004.12

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    DOI: 10.14989/57883

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  • Adaptive image-band interference canceller based on CM (constant modulus) criteria for multimode receivers

    DENNO S.

    IEEE VTC'04-Spring   2004

  • Recursive vector Viterbi algorithm for multibeam interference cancellers

    DENNO S.

    Proc. IEEE VTC, 2003   3   1890 - 1894   2003

  • Development of an adaptive array based on subband signal processing Reviewed

    Y Kamiya, S Denno, Y Mizuguchi, M Katayama, A Ogawa, Y Karasawa

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE   85 ( 10 )   19 - 30   2002

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    Adaptive arrays for spatiotemporal signal processing are expected to be effective multipath measures in future high-speed mobile communications systems. However, a problem is the tremendous computational load in a hardware implementation because the number of weights that are adaptively controlled becomes extremely large. There fore, the key to its practical use is to reduce the computational load. In this paper, an adaptive array for processing subband signals that can substantially reduce the computational load was implemented in hardware by using a commercially available digital signal processor (DSP). First, we illustrated the scale of the hardware by the number of DSPs needed in each unit that performed the required signal processing. Next, we built a simple multipath environment of two waves in an anechoic chamber and performed experiments to demonstrate the basic performance and veri fled that performance nearly equal to the theoretical values was obtained. (C) 2002 Wiley Periodicals, Inc.

    DOI: 10.1002/ecjc.1122

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  • Performance and configuration of M-CMA (modified constant modulus algorithm) adaptive array using polyphase filters Reviewed

    Satoshi Denno, Takashi Ohira

    Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)   85 ( 12 )   53 - 64   2002

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    As a way to realize an adaptive array of small size, low cost, and low power consumption, there exists a configuration method combining analog signal processing and digital signal processing. M-CMA has been proposed as a control algorithm for such an approach. However, when this approach is applied to an actual communication system, there arises the problem that the narrow-band filter in the receiver prevents M-CMA from converging to the desired solution. In this paper, in order to effectively operate an M-CMA adaptive array in the presence of a narrow-band filter, a configuration is proposed in which polyphase filters are used as narrow-band filters. Its superior interference suppression capability is confirmed by a theoretical analysis and computer simulation.

    DOI: 10.1002/ecja.10021

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  • Performance and Configuration of M-CMA (Modified Constant Modulus Algorithm) Adaptive Array using Polyphase Filters

    DENNO Satoshi, OHIRA Takashi

    The Transactions of the Institute of Electronics,Information and Communication Engineers B   84 ( 10 )   1796 - 1806   2001.10

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  • Algorithm Diversity in a Software Antenna

    KARASAWA Yoshio, KAMIYA Yukihiro, INOUE Takashi, DENNO Satoshi

    IEIEC Trans. Comm., B   83 ( 6 )   1229 - 1236   2000.6

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    Asoftware antenna, which will be a key device realizing flexible and highly reliable wireless communications systems, is inherently matched with software defined radios(SDR).In this paper, first, key technologies on the software antenna are introduced. The technologies contain i)how to recognize the radio environment, ii)how to determine the optimum adaptive signal processing algorithm, and iii)how to reconfigure the digital beamforming circuit. Then, an image of a software antenna with reconfigurable eigenvector-beamspace configuration is presented. Finally, by assuming various propagation conditions, performance of the software antenna in terms of algorithm diversity is demonstrated.

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  • Modified constant modulus algorithm for digital signal processing adaptive antennas with microwave analog beamforming

    DENNO S.

    IEEE Aerospace Conference. Big Sky   2000

  • M-CMA for digital signal processing adaptive antennas with microwave beamforming

    DENNO S.

    2000 IEEE Aerospace Conf., Big Sky, Montana, Mar.   5   179 - 187   2000

  • A Software Antenna: Reconfigurable Adaptive Arrays Based on Eigenvalue Decomposition

    KAMIYA Yukihiro, KARASAWA Yoshio, DENNO Satoshi, MIZUGUCHI Yoshihiko

    IEICE Trans. Commun., B   82 ( 12 )   2012 - 2020   1999.12

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    Multimedia mobile communication systems are expected to be realized in the near future. In such systems, multipath fading can cause severe degradations of the quality of the communications due to its wide bandwidth, especially in urban areas. Adaptive array antennas can be attractive solution for overcoming the multipath fading. Suppression can be achieved with the adaptive array by cophasing and combining multipath signals in the space and time domain. On the other hand, the concept of software antenna has been proposed. The software antenna recognizes radiowave environments and appropriately reconfigures itself for the signal processing required by the recognized environment. Efficient implementations can be expected if these functions are realized by the software. In this paper, we propose two types of the adaptive array systems which is reconfigurable depending on the radiowave environment as a realization of the concept of the software antenna. They recognize the environment by using the eigenvalue decomposition of space domain correlation matrices and reconfigure their structures of the signal processing. The principle and performance are examined by theoretical means and through computer simulations.

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  • Orthogonal-transformed variable-gain least mean squares (OVLMS) algorithm for fractional tap-spaced adaptive MLSE equalizers Reviewed

    S. Denno, Y. Saito

    IEEE Transactions on Communications   47 ( 8 )   1151 - 1160   1999

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    DOI: 10.1109/26.780451

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  • 40 Mbit/s adaptive MLSE equalizer LSI and its performance in 5 GHz-Band transmission system

    Yushi Shirato, Kiyoshi Kobayashi, Satoshi Denno

    IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall   1   305 - 308   1999

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    The authors have developed a single chip, 40 Mbit/s operation, 3-tap MLSE equalizer LSI. The LSI supports burst operation and is available for both QPSK and π/4-QPSK modulated signals. This paper shows the performance of a 5 GHz-Band 40 Mbit/s experimental system using this equalizer LSI. The main results are as follows; 1) The implicit diversity gain offered by the equalizer is 12 dB at the BER of 10-3. 2) The gain obtained in 2-branch diversity reception is 6 dB at the BER of 10-3. 3) In single branch operation, no error floor is observed when the BER is higher than 10-4. Furthermore, 2-branch diversity reception limits the irreducible bit errors to one tenth that of single branch reception. 4) The DC offset compensator effectively minimizes the degradation introduced by the DC offset caused by the imperfection of the demodulator. 5) The same performance is observed for both modulation schemes. The LSI can be used in wide band wireless applications like indoor wireless LAN systems and wide area wireless local loop systems.

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  • 6. 144Mbit/s Burst Modem with an Adaptive Equalizer for TDMA Mobile Radio Communications Reviewed

    Satoshi DENNO, Yushi SHIRATO

    IEICE Transaction on Communications   E81-B ( 7 )   1453 - 1461   1998.7

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  • 通信方式

    守倉 正博, 梅原 大祐, 山本 高至, 村田 英一, 田野 哲( Role: Joint author ,  ディジタル変調等)

    オーム社  2013.11  ( ISBN:9784274214738

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    Total pages:vi, 180p   Language:Japanese

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  • 広帯域ワイヤレス通信のソフトウェアアンテナ技術

    唐沢好男, 千葉勇, 田野哲, 関口高志, 田中豊久, 三浦龍( Role: Joint author ,  時間領域信号処理)

    トリケップス  1999.3 

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MISC

  • 送信アンテナ数が少ないMIMOシステムの過負荷MIMOによる高速化とその特性改善法

    杉本 匠, 田野 哲, 侯 亜飛

    電子情報通信学会 無線システム研究会   2023.12

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  • 物理層ネットワークコーディングを用いた双方向2ホップ中継システムのための中継端末選択法とその効果

    早水理人, 田野 哲, 侯 亜飛

    電子情報通信学会 短距離無線通信研究会(SRW)   123 ( 275 )   24 - 29   2023.11

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  • Reduced Complexity Resource Allocation For Frequency Domain Non-orthogonal Multiple Access.

    Satoshi Denno, Taichi Yamagami, Yafei Hou

    2023   B-5-59   2023.3

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    Other Link: https://dblp.uni-trier.de/db/conf/wcnc/wcnc2023.html#DennoYH23

  • A configuration for overloaded MU-MIMO systems

    宮田一輝, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   123 ( 108(RCS2023 79-100) )   2023

  • Optimal Modulation Selection and Inter-Lighting Interference Reduction for LED Visible Light Wireless Communications by Spatially Parallel Signal Transmission

    田主春月, 藤井円香, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会技術研究報告(Web)   123 ( 75(SRW2023 1-10) )   39 - 42   2023

  • Mitigation of the Performance Loss of Spatial Modulation using LCX from Position Mismatch

    嶽草一郎, 永山拳大, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • Evaluation of signal separation and demodulation performance by stored data batch signal processing considering transmitter characteristics

    三田湧大, 日笠智文, 平川拓志, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • An Investigation of the Tradeoff between the Power Efficiency and Constellation Performance for RIS based Spatial Modulation System

    前崎一星, 虫明春哉, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • An Optimal Modulation Selection Method in LED Visible Light Wireless Communications by Spatially Parallel Signal Transmission

    田主春月, 藤井円香, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会技術研究報告(Web)   122 ( 401(SRW2022 43-69) )   2023

  • A Study on Continuous Phase Signal Separation and Demodulation Method Using Stored Data Batch Signal Processing

    Tomofumi Hikasa, Takuyuki Hirakawa, Syo Nakaie, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    IEICE Communication Express   X11-B ( 12 )   2022.12

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  • 可視光通信におけるLEDの非線形性に応じた選択型非線形歪補償の検討 Reviewed

    中山 海人, 冨里 繁, 田野 哲, 上原 一浩

    The 24th IEEE Hiroshima Section Student Symposium   147 - 150   2022.11

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  • LED可視光通信の空間的並列信号伝送における非線形歪補償を用いた最適変調方式選択手法の検討 Reviewed

    田主 春月, 冨里 繁, 田野 哲, 上原 一浩

    The 24th IEEE Hiroshima Section Student Symposium   143 - 146   2022.11

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  • Nonlinear Overloaded MIMO Communication System with Equal Gain Filter

    杉本匠, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   122 ( 252 )   155 - 160   2022.11

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  • 蓄積一括信号処理による帯域制限された連続位相信号の分離・復調技術の検討 Reviewed

    日笠 智文, 平川 拓志, 中家 翔, 冨里 繁, 田野 哲, 上原 一浩

    The 24th IEEE Hiroshima Section Student Symposium   20 - 22   2022.11

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  • 蓄積一括信号処理による振幅偏移変調の分離・復調技術の一検討 Reviewed

    本吉 隼大, 広瀬 陸, 日笠 智文, 冨里 繁, 田野 哲, 上原 一浩

    The 24th IEEE Hiroshima Section Student Symposium   69 - 72   2022.11

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  • Novel Wireless Communication System Realized by Mobile Terminal Collaboration-Recent Results and Application to Uplink Transmission- Invited

    村田英一, 井田悠太, 丸田一輝, 實松豊, 牟田修, 岡田啓, 岡本英二, 眞田幸俊, 西村寿彦, 田野哲

    電子情報通信学会技術研究報告(Web)   122 ( 235 )   107 - 107   2022.10

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  • Performance of Frequency Domain Non-orthogonal Multiple Access With Adaptive Resource Allocation Invited

    田野哲, 山上太智, HOU Yafei

    電子情報通信学会技術研究報告(Web)   122 ( 235 )   10 - 102   2022.10

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  • Shared Dataset Initiative toward Applications of Machine Learning and Mathematical Optimization for Wireless Communications Invited Reviewed

    丸田一輝, 井田悠太, 實松豊, 牟田修, 岡田啓, 西村寿彦, 岡本英二, 眞田幸俊, 村田英一, 田野哲

    電子情報通信学会誌   105 ( 6 )   509 - 515   2022.6

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  • A Study on Iterative Soft Decision Maximum Likelihood Decoding Method for MIMO-OFDM

    真壁修平, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   121 ( 391 )   25 - 30   2022.3

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  • 過負荷MIMO無線通信システムのための線形受信機の研究

    田野哲, 侯亜飛

    電気通信普及財団研究調査助成報告書(Web)   ( 37 )   2022

  • 位置情報を用いた漏洩同軸ケーブルスロットの開閉による空間変調の容量拡大の研究

    侯亜飛, 田野哲

    電気通信普及財団研究調査助成報告書(Web)   ( 37 )   2022

  • A Selective Non-Linear Distortion Compensation Method for an LED Visible Light Communication Receiver

    中山海人, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   73rd   2022

  • A Study on a Separation and Demodulation Method of Amplitude Shift Keying Using Feature Demodulation Method

    本吉隼大, 広瀬陸, 日笠智文, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   73rd   2022

  • Signal separation and demodulation technology by stored data batch signal processing considering detection method

    三田湧大, 日笠智文, 平川拓志, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   73rd   2022

  • An Inter-Lighting Interference Reduction Method in LED Visible Light Wireless Communications by Spatially Parallel Signal Transmission

    日笠颯汰, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Signal separation and demodulation technology by stored data batch signal processing considering transceiver characteristics

    三田湧大, 日笠智文, 平川拓志, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Pre-Distortion Characteristics Error Impact of Collaborative Linearization in Both Transmitter and Receiver for LED Visible Light Communications

    得居紀宏, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Iterative Soft Decision Maximum Likelihood Decoding Method for MIMO-OFDM

    真壁修平, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • A Study on Generalized Time-Frequency Spatial Modulation System using Variable Partial OFDM Symbol Transmission

    青山智哉, HOU Yafei, 田野哲

    電子情報通信学会技術研究報告(Web)   IEICE-121 ( 234 )   148 - 153   2021.11

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  • Soft Input Decoding Based on Superposition of Hard Decision Signals

    柏原光希, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   IEICE-121 ( 265 )   7 - 12   2021.11

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  • 蓄積一括信号処理による帯域制限された信号の分離性能評価

    平川 拓志, 西山 徹, 中家 翔, 冨里 繁, 田野 哲, 上原 一浩

    The 23rd Hiroshima Section Student Symposium   25 - 26   2021.11

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  • LED可視光通信用送受協調線形化の高効率変調における受信特性改善効果

    劉 正欣, 平井 啓太郎, 冨里 繁, 田野 哲, 上原 一浩

    The 23rd Hiroshima Section Student Symposium   108 - 110   2021.11

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  • LED可視光通信における周波数特性及び非線形歪補償による受信特性改善

    得居 紀宏, 冨里 繁, 田野 哲, 上原 一浩

    The 23rd Hiroshima Section Student Symposium   27 - 30   2021.11

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  • 空間的並列信号伝送を用いたLED可視光無線通信における送信信号の適応分配手法の検討

    日笠 颯汰, 冨里 繁, 田野 哲, 上原 一浩

    The 23rd Hiroshima Section Student Symposium   184 - 187   2021.11

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  • Optimal terminal selection based on Doppler frequency estimation for terminal cooperative communications

    藤井拓真, 田野哲, HOU Yafei, 村田英一

    電子情報通信学会技術研究報告(Web)   IEICE-121 ( 173 )   82 - 87   2021.9

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  • Precoding method for Overloaded Physical-Layer Network Coding

    谷川智也, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021.9

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  • A proposal of Spatial Modulation using Slots of Leaky Coaxial Cable

    永山拳大, ZHU Junjie, HOU Pengcheng, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2021   289 - 290   2021.9

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  • Opportunistic Scheduling for Downlink MU-MIMO Systems

    LU Youchen, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   121 ( 145(SRW2021 13-28) )   2021.8

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  • Non-Orthogonal Multiple Access that allocates subcarriers based on factor graphs

    山上大智, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   IEICE-120 ( 406 )   7 - 13   2021.3

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  • 蓄積一括信号処理における信号の重畳度とD/Uに関する信号分離性能の検討

    平川拓志, 西山徹, 中家翔, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(web)   2021.3

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  • 蓄積蓄積一括信号処理における信号の重畳度とEb/N0に関する信号分離性能の検討

    中家 翔, 西山 徹, 平川拓志, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(web)   2021.3

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  • Maximum Likelihood Doppler Frequency Detection Using Channel Impulse Response Estimation

    堀田和真, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021.3

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  • ファクタグラフに基づくチャネル割当を行う非直交多元接続の特性

    山上大智, 田野哲, 侯亜飛

    電子情報通信学会大会講演論文集(web)   2021.3

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  • Positioning Scheme by vertical placement for LCX-MIMO system

    永山拳大, ZHU Junjie, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021.3

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  • A Study on Continuous Phase Signal Separation and Demodulation Method Using Stored Batch Signal Processing

    日笠智文, 平川拓志, 中家翔, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   72nd   2021

  • A study on a separation and demodulation method of multiple signals using stored batch signal processing

    広瀬陸, 中家翔, 平川拓志, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   72nd   2021

  • LED Frequency Response and Non-Linear Distortion Compensation for Visible Light Communications

    得居紀宏, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   72nd   2021

  • Spatially Parallel Signal Transmission by Adaptive Transmission Allocation for LED Visible Light Wireless Communications

    日笠颯汰, 冨里繁, 田野哲, 上原一浩

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   72nd   2021

  • チャネル応答を用いるドップラー周波数判定法

    堀田和真, 田野 哲, 侯 亜飛

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-120 ( 260 )   1 - 6   2020.11

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  • 過負荷物理層ネットワークコーディングの構成法

    谷川智也, 田野 哲, 侯 亜飛

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-120 ( 260 )   7 - 12   2020.11

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  • LED可視光無線通信における空間的並列信号伝送の検討 Invited

    冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 無線通信システム研究会技術報告   IEICE-120 ( 249 )   51 - 55   2020.11

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  • Shared Dataset Framework toward Applications of Machine Learning and Mathematical Optimization for 6G

    丸田一輝, 井田悠太, HOU Yafei, 牟田修, 岡田啓, 西村寿彦, 岡本英二, 眞田幸俊, 村田英一, 田野哲

    電子情報通信学会技術研究報告(Web)   IEICE-120 ( 204 )   1 - 6   2020.10

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  • 蓄積一括信号処理による衝突した受信信号の分離・復調方法におけるSTFT窓幅の一検討

    西山 徹, 平川拓志, 中家 翔, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会大会講演論文集(web)   2020.9

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  • 物理層ネットワークコーディングを用いた双方向無線中継のための多値QAM変調用の符号化変調方式

    田野 哲, 侯 亜飛

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-120 ( 81 )   7 - 7   2020.6

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  • Soft Decision Decoding using MMSE-Based Lattice Reduction for MIMO

    柏原光希, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2020   2020.3

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  • ベクトル型周期性干渉除去のための適応サイドバンド選択法

    古谷 侑也, 田野 哲

    電子情報通信学会大会講演論文集(CD-ROM)   2020.3

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  • 物理層ネットワークコーディングを用いた双方向無線中継のための多値QAM変調用の符号化変調方

    田野 哲, 侯亜飛

    電子情報通信学会大会講演論文集(CD-ROM)   2020.3

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  • 蓄積一括信号処理による衝突した受信信号の分離・復調方法の一検討

    西山 徹, 宮地龍功, 大野文也, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2020.3

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  • 高効率変調を用いたLED可視光通信における送受協調線形化手法

    平井啓太郎, 後藤晨兵, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2020.3

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  • Iterative Hard Dicision Decoding in a Linear Multilevel QAM Receiver for Overloaded MIMO

    IEICE-119 ( 378 )   1 - 6   2020.1

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  • 屋内無線通信用LED可視光通信における干渉と非線形歪雑音除去手法の検討

    平井啓太郎, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-119 ( 265 )   63 - 68   2019.11

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  • 適応プリコーディングを用いたXOR物理層ネットワークコーディングとその特性 Invited

    田野 哲

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-119 ( 265 )   7 - 12   2019.11

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  • LED可視光通信用送受協調型非線形歪補償を用いる空間的並列伝送の検討

    惠良紗呂磨, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-119 ( 265 )   73 - 78   2019.11

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  • 蓄積一括信号処理による衝突した受信信号の分離・復調方法の一検討

    西山 徹, 宮地龍功, 大野文也, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 革新的無線通信技術に関する横断型研究会技術報告   2019.10

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  • LED可視光無線通信の空間的並列伝送時における受信可能信号数の評価

    亀井裕典, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 革新的無線通信技術に関する横断型研究会技術報告   2019.10

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  • ベクトル型適応周期性干渉除去

    古谷侑也, 田野哲, 侯亜飛

    電子情報通信学会大会講演論文集(CD-ROM)   2019.9

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  • 蓄積一括信号処理による信号分離・復調方法の一検討

    西山徹, 宮地龍功, 大野文也, 冨里繁, 田野哲, 上原一浩

    電子情報通信学会大会講演論文集(CD-ROM)   2019.9

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  • LED可視光通信における空間的並列信号伝送のための照明配置方法の検討

    亀井裕典, 冨里 繁, 田野 哲, 上原一浩

    電子情報通信学会 短距離無線通信研究会技術報告   IEICE-118 ( 476 )   41 - 46   2019.3

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  • A Study on Joint Probability Distribution Property of Busy/Idle Duration and its Impact on the Performance of Auto-regressive Based Predictor over Real Environmental Channel

    Yafei Hou, Kazuto Yano, Satoshi Denno, Yoshinori Suzuki

    電子情報通信学会 スマート無線通信研究会技術報告   IEICE-119 ( 475 )   89 - 96   2019.3

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  • 多値変調を用いた過負荷MIMOシステムのための基底格子縮小を用いた繰り返し線形受信機の検討

    藤原拓哉, 田野哲, 侯亜飛

    電子情報通信学会大会講演論文集(CD-ROM)   2019.3

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  • 軟入力の振幅制限を行う過負荷繰返し線形MIMO受信機

    井上 翼, 田野哲, 侯亜飛

    電子情報通信学会大会講演論文集(CD-ROM)   2019.3

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  • A Study on Categorization of Busy/Idle History for Autoregressive Based Busy/Idle Duration Prediction over Real Environmental Channel

    118 ( 434 )   121 - 126   2019.1

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  • Side band selection for cancellation of periodic interference

    117 ( 396 )   61 - 65   2018.1

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  • Invited Talk : Adaptive Periodic Interference Cancellation for Narrow-Band Wireless Systems Invited

    117 ( 284 )   187 - 192   2017.11

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  • Invited Talk : Adaptive Periodic Interference Cancellation for Narrow-Band Wireless Systems Invited

    117 ( 283 )   131 - 136   2017.11

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  • A non-linear distortion compensation method in a receiver of LED visible light communications

    117 ( 178 )   31 - 34   2017.8

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  • Development of Mobile Terminal Dual Band Antenna for Collaborative Interference Canceller

    117 ( 132 )   73 - 78   2017.7

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  • Performance Evaluation of Collaborative Interference Canceller with Quantization Error and Spatial Correlation

    117 ( 132 )   67 - 72   2017.7

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  • Transmission Performance Improvement by Saturation Control of LEDs in Visible Light Communication

    117 ( 84 )   1 - 4   2017.6

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  • Terminal Selection for Uplink and Downlink Multi user Communication System with non linear filtering

    116 ( 481 )   105 - 110   2017.3

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  • 16QAM Physical layer Network coding using Non-linear Precoding

    116 ( 479 )   259 - 263   2017.3

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  • Transmission Performance of Visible Light Communications Using Saturated LEDs

    116 ( 481 )   99 - 104   2017.3

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  • Capacity of Collaborative Interference Canceller : Quantization Error and Spatial Correlation

    116 ( 468 )   63 - 68   2017.2

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  • A Study of Received Signal Sharing Schemes for Collaborative Interference Canceller (通信方式)

    梅原 大祐, 上野 修平, 赤城 僚太, 村田 英一, 田野 哲

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 468 )   69 - 74   2017.2

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  • PCM-RoHR for Collaborative Interference Canceller and Its Performance Evaluation Reviewed

    Ueno Shuhei, Umehara Daisuke, Denno Satoshi

    The Journal of The Institute of Image Information and Television Engineers   71 ( 2 )   J74 - J79   2017

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    DOI: 10.3169/itej.71.J74

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  • A Non-Linear Distortion Compensation Method for Transmitters and Receivers of LED Visible Light Communications Reviewed

    Takaaki Kumagai, Chikamori Takahiro, Tomisato Shigeru, Satoshi Denno, Furuno Tatsuo, Oda Yasuhiro

    The Journal of The Institute of Image Information and Television Engineers   71 ( 2 )   J80 - J86   2017

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    DOI: 10.3169/itej.71.J80

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  • Terminal selection for THP with Ordering Cholesky Factorization

    116 ( 383 )   111 - 116   2016.12

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  • Collaborative MIMO Communication System Exploiting Higher-Frequency Bands

    116 ( 308 )   1 - 5   2016.11

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  • Technology Exhibit : Collaborative MIMO Receiver Exploiting Higher-Frequency Bands

    116 ( 276 )   33 - 37   2016.10

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  • R&D Activities for 5G in IEICE Technical Committee on Radio Communication Systems in FY2015 : Multi-Antenna Technologies and Advanced Modulation/Multiple Access Schemes (無線通信システム)

    Sanada Yukitoshi, Denno Satoshi, Murata Hidekazu, Nishimura Toshihiko, Tandai Tomoya, Okazaki Akihiro, Suyama Satoshi, Mashino Jun, Yamamoto Tetsuya, Taromaru Makoto

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 147 )   177 - 182   2016.7

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  • A Study on Helper MIMO and Its Decoding Procedure

    116 ( 62 )   101 - 106   2016.5

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  • B-5-129 The Effect of Non-Linear Distortion Compensation in LED Visible Light Communications

    Kumagai Takaaki, Matsuno Hiroaki, Tomisato Shigeru, Denno Satoshi, Hata Masaharu, Furuno Tatsuo, Oda Yasuhiro

    Proceedings of the IEICE General Conference   2016 ( 1 )   522 - 522   2016.3

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  • B-19-14 Transmission Performance of Single Carrier Visible Light Communication systems with Frequency Domain Equalization

    Denno Satoshi, Fujitaka Shunsuke, Furuno Tatsuo, Oda Yasuhiro

    Proceedings of the IEICE General Conference   2016 ( 2 )   576 - 576   2016.3

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  • B-5-116 Complexity Reduction Techniques in Receivers with Adaptive Selection of Extended Rotation Matrix used for Virtual Channels

    Denno Satoshi, Kitamoto Akihiro

    Proceedings of the IEICE General Conference   2016 ( 1 )   509 - 509   2016.3

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  • B-5-115 16QAM Receiver Constitution Method of Applying the Virtual Channel for Overload MIMO-OFDM Systems

    Sawada Ryosuke, Denno Satoshi

    Proceedings of the IEICE General Conference   2016 ( 1 )   508 - 508   2016.3

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  • B-8-60 A Study of Wideband OQPSK and Its Frequency Domain Equalization

    Hiramoto Kazuki, Umehara Daisuke, Murata Hidekazu, Denno Satoshi

    Proceedings of the IEICE General Conference   2016 ( 2 )   259 - 259   2016.3

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  • B-5-134 MU-MIMO system used THP with Cholesky factorizationof selected user by random access in uplink and performance

    Baba Tomoyuki, Denno Satoshi

    Proceedings of the IEICE General Conference   2016 ( 1 )   527 - 527   2016.3

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  • 端末連携受信方式における特性改善法の検討 (短距離無線通信)

    川口 悠太, 田野 哲, 村田 英一

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 275 )   1 - 5   2015.10

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  • A MIMO Receiver with Extended Rotation Matrix Adaptive to Wireless channels

    115 ( 2 )   59 - 63   2015.4

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  • 5GHz Band OFDM Packet Transmission Characteristics Using USRP

    NAKAO Satoshi, UMEHARA Daisuke, MURATA Hidekazu, DENNO Satoshi

    IEICE technical report. Circuits and systems   114 ( 462 )   19 - 24   2015.2

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    In this manuscript, an orthogonal frequency division multiplexing (OFDM) packet wireless communication system is implemented towards constructing a testbed for cooperative wireless communication systems. The system is composed of software defined radio (SDR) with universal software radio peripheral (USRP) and GNU Radio. OFDM modulation is constructed by the 1/4 scale model of IEEE802.11a standard. The observed OFDM frequency spectrum is compared with the spectrum mask of IEEE802.11a standard so that windowing is required to agree with it. Furthermore, the estimated channel state information (CSI) is shown in amplitude and phase spectrum to compensate the multipath fading. The experimental results show that the received sensitivity of -59 dBm attains at the packet error rate (PER) of 1% when subcarriers are modulated by quadrature phase shift keying (QPSK) and the received sensitivity of -61 dBm attains at 1% PER when subcarriers are modulated by binary PSK (BPSK).

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  • Power Control of THP used Bi-directional MIMO Relay System

    CAO Lengchi, DENNO Satoshi

    Technical report of IEICE. RCS   114 ( 395 )   175 - 180   2015.1

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    Bi-directional wireless relaying has been demonstrated to raise transmission throughput intensively as large as twice in throughput by applying physical layer network coding (PNC) when a pair of terminals exchange information via relay. With the aim to enhance the performance of relay system based on decode-and-amplify (DF) strategy, we propose a power control (PC) structure applied in Tomlinson-Harashima precoding (THP) used PNC scheme. The PC structure can be realized by adding a simple filter, aiming to control the transmission power without increasing bit error rate (BER). It is proved that the proposed PC structure can significantly reduce both transmission power and BER of bi-directional MIMO relay system, showing better performance than THP used PNC without PC structure.

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  • MIMO Receivers with Virtual Channels

    DENNO Satoshi

    IEICE technical report. Signal processing   114 ( 394 )   103 - 108   2015.1

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    The more signal streams than receive antennas are spatially multiplexed in overloaded multiple-input-multiple-output (MIMO) Spatial multiplexing which potentially enables wireless systems to achieve higher speed transmission. In overloaded MIMO systems, most conventional MIMO linear detectors have very poor transmission performance. In contrast with them, nonlinear detectors such as the maximum likelihood detector (MLD) achieve superior performance even in overloaded MIMO systems. On the other hand, MIMO receivers with virtual channels that achieve superior performance, even though the MIMO receiver can be implemented with much lower computational complexity than the MLD. Basically, the transmission signal vector is decomposed into a real signal vector and a rotation matrix in the receiver. The MIMO receiver with virtual channels comprises a linear detector to regenerate the real signal of the transmission signal and nonlinear detector to search the rotation matrix. The paper describes techniques to improve the real signal detection performance and the virtual channel detection performance. Performance of these techniques are evaluated by computer simulation.

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  • Power Control of THP used Bi-directional MIMO Relay System

    CAO Lengchi, DENNO Satoshi

    IEICE technical report. Signal processing   114 ( 394 )   175 - 180   2015.1

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    Bi-directional wireless relaying has been demonstrated to raise transmission throughput intensively as large as twice in throughput by applying physical layer network coding (PNC) when a pair of terminals exchange information via relay. With the aim to enhance the performance of relay system based on decode-and-amplify (DF) strategy, we propose a power control (PC) structure applied in Tomlinson-Harashima precoding (THP) used PNC scheme. The PC structure can be realized by adding a simple filter, aiming to control the transmission power without increasing bit error rate (BER). It is proved that the proposed PC structure can significantly reduce both transmission power and BER of bi-directional MIMO relay system, showing better performance than THP used PNC without PC structure.

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  • A MIMO receiver for trellis coded 16QAM with virtual channels

    OSAI Hidenori, DENNO Satoshi

    IEICE technical report. Signal processing   114 ( 394 )   135 - 140   2015.1

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    In this paper, we propose a MIMO receiver for the 16QAM modulation scheme by trellis coding. In the proposed system, it have take advantage of the trellis coded 16QAM that captures as an integral multi-level modulation 16QAM and coding. It is an effective method in that it allows high-speed communication while has a coding gain. To detect the stream When the number of receive antennas is less than that of transmit antennas, the virtual channels are introduced in the proposed receiver. Furthermore, this paper proposed to apply a gain-factor for the proposes receiver to employ the lattice-reduction for the virtual channels. While the use of virtual channels improves the transmission performance, the lattice-reduction makes it possible to detect more signal streams. In this paper, I was evaluated by computer simulation for BER characteristics and multiplication cost of the proposed MIMO receiver.

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  • Turbo coded successive detector with virtual channels for MIMO-OFDM Reviewed

    Akihito Taya, Satoshi Denno, Koji Yamamoto, Masahiro Morikura, Daisuke Umehara, Hidekazu Murata, Susumu Yoshida

    2012 IEEE International Conference on Wireless Information Tech nology and Systems, Maui, Hawaii   1   1 - 5   2012.12

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  • Applicability of distributed transmit power control based on uplink-downlink duality to multi-user distributed antenna systems Reviewed

    Shigemasa Kumagawa, Koji Yamamoto, Hidekazu Murata, Susumu Yoshida, Daisuke Umehara, Satoshi Denno, Masahiro Morikura

    IEEE International Conference on Communication Systems (ICCS 2012), Singapore   2012.11

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  • Field Propagation Measurements for Multi-user MIMO Transmission Experiments on 5GHz Band

    YOSHIKAWA Kenichi, TANIGUCHI Masato, MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    111 ( 403 )   55 - 60   2012.1

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  • Highly Accurate Estimation of Frequency Offset under Co-Channel Interference Conditions

    MATSUMOTO Yuya, DENNO Satoshi, TOMISATO Shigeru, HATA Masaharu

    111 ( 403 )   115 - 120   2012.1

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  • Laboratory Experiments of USRP/UHD Wireless Terminal for Multi-uesr MIMO Systems

    DOI Hiroshi, MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    Technical report of IEICE. RCS   111 ( 260 )   31 - 35   2011.10

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    In a multi-user MIMO system which can increase the spectral efficiency in wireless communications, MIMO preceding can reduce signal processing complexity and power consumption of mobile stations. In this paper, experimental results of the universal software radio peripheral (USRP) are reported. Mobile stations for a multi-user MIMO preceding system are implemented by using USRP. The universal hardware driver (UHD) is used in this implementation. An advantage of using UHD is that it makes easier to manage timing of USRP. In addition, as laboratory experiments of USRP and UHD, it is shown that its frequency stability, time resolution and the error vector magnitude performance during amplify and forward operation.

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  • Study of Optimal Cluster Size Depending on Scheduling Algorithms in Multi-User Distributed Antenna System

    KOBAYASHI Masahiro, YAMAMOTO Koji, MURATA Hidekazu, YOSHIDA Susumu, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    Technical report of IEICE. RCS   111 ( 260 )   201 - 206   2011.10

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    In wireless communications, a distributed antenna system (DAS) is a promising technique to increase the spectral efficiency. DAS consists of geographically distributed base station antennas, which enables to perform virtual MIMO transmission and achieve macro-diversity efficiency. DAS has many degrees of freedom such as antenna selection, clustering of antennas, and transmission schemes, and therefore it is complicated to analyze. In this paper, the cluster size in DAS is considered to be similar to the radius of cells in cellular systems. In clustering based on location, the coverage area of clusters and the area of base station antennas used for transmission can be set individually. The simulation results show that the optimal cluster size for base station antennas depends on the scheduling algorithm when analyzed in perspective of area spectral efficiency.

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  • In-lab Transmission Experiments of Multi-user MIMO Precoding System

    UEYAMA Yuichi, MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    Technical report of IEICE. RCS   111 ( 260 )   37 - 40   2011.10

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    This paper reports the performance of a multi-user MIMO linear precoding system using a two-way MIMO channel estimation technique. Hardware implementation feasibility of this technique is not studied yet. The experimental system consists of a base station with two antennas and two mobile stations. In this paper, feasibility of the multi-user MIMO precoding system using a two-way channel estimation technique is shown by in-lab experiments using a fading emulator.

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  • A Comparative Discussion of the Error Estimation Accuracy of Hilbert Transformer for Multi-mode Receivers with Baseband AGC

    KOSUGA Yohei, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   111 ( 261 )   37 - 41   2011.10

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    This paper proposes a novel scheme to estimate the imbalance of the RF devices included in RF analog Hilbert transformer in heterodyne multimode receivers with baseband AGC, which enables the receiver to receive signals in arbitrary frequency band with realistic hardware complexity. The performance of the estimation scheme is verified by computer simulation in terms of the root mean square (RMS) of the estimation error, and the distribution of the error. Furthermore, it is also shown that the performance of the proposed scheme is enhanced by feeding the estimated value back to the RF analog devices. The performance is compared with that of conventional techniques.

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  • Performance Improvement against Imperfection of Analog Devices for Complexity Reduced Multimode MIMO Receiver

    OHTA Tomoya, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   111 ( 261 )   29 - 36   2011.10

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    Cognitive radios are of interest because they are capable of high frequency utilization efficiency. For the cognitive radios, a multimode MIMO receiver based on heterodyne reception has been proposed. This paper proposes the complexity reduced receiver to achieve high performance by correcting Hilbert transformer imperfection at the intermediate frequency (IF) band. However, imperfection of the analog circuit at the feedback loop causes poor performance. Therefore, the scheme for correcting the imperfection of the analog circuit is proposed.

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  • Possibilities and Issues of Coherent Distributed Antenna Systems : Towards Realization of Green Wireless Systems

    MURATA Hidekazu, YOSHIDA Susumu, YAMAMOTO Koji, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report. WBS, Wideband System   111 ( 244 )   9 - 12   2011.10

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    This paper presents an experimental setup of a multi-user MIMO linear precoding system. The experimental system consists of a base station with two antennas and two mobile stations. In this system, a two-way channel estimation technique is implemented in which mobile stations just send back the received signals along with their training sequences. In this technique, the base station can obtain the channel coefficients of both the uplink and the downlink. This two-way multiple-input multiple-output channel estimation technique has been pro- posed and mathematically analyzed in literature. Computer simulation results have been reported to identify the required hardware specifications for amplify and forward operation in mobile stations by examining the bit error rate performance. However, hardware implementation feasibility of this technique is not studied yet. In this paper, feasibility of a multi-user MIMO linear precoding system using two-way channel estimation technique is shown by in-lab experiments.

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  • Throughput Analysis of Two-Way Relay Channels by M-ary CoMP Physical-Layer Network Coding

    UMEHARA Daisuke, YAMAMOTO Koji, MURATA Hidekazu, DENNO Satoshi, MORIKURA Masahiro, YOSHIDA Susumu

    111 ( 301 )   7 - 12   2011.10

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  • BS-3-3 Introducing Distributed Power Control Using 2-bit Feedback Information to Distributed Antenna System

    Kumagawa Shigemasa, Yamamoto Koji, Murata Hidekazu, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2011 ( 1 )   "S - 37"-"S-38"   2011.8

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  • B-5-1 A Comparative Discussion of the Error Estimation Accuracy of Hubert Transformer for Multi-mode Receivers with Baseband AGC

    Kosuga Yohei, Denno Satoshi, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2011 ( 1 )   380 - 380   2011.8

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  • Coexistence Scheme between WLAN and Wireless Sensor Network

    FUJII Yohei, MORIKURA Masahiro, UMEHARA Daisuke, DENNO Satoshi, OTSUKI Nobuaki, SUGIYAMA Takatoshi

    IEICE technical report   111 ( 68 )   65 - 70   2011.5

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    This paper proposes a new control scheme between IEEE 802.11 (WLAN) devices and IEEE 802.15.4 (Wireless Sensor Network) devices, operating in the same radio frequency band. The new control scheme employs a hybird - station (H-STA) which has both network device functions to improve the transmission quality. The proposed control scheme enables to ensure data transmission quality of WSN with little performance degradation of WLAN throughput performances by using RTS (Request To Send), CTS (Clear To Send) and CTS-to-self packets. Results of computer simulations show that the beacon failure probability of WSN is the value less than 10 % when the WLAN system consists of 15 stations with saturated data traffic.

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  • Performance Improvement of Wireless Relay CSMA/CA System Employing Network Coding by QoS Control

    NAKATO Yuki, MORIKURA Masahiro, UMEHARA Daisuke, DENNO Satoshi, OTSUKI Nobuaki, SUGIYAMA Takatoshi

    IEICE technical report   111 ( 68 )   71 - 76   2011.5

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    This paper proposes new priority control schemes for a two-hop wireless relay system which employs the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol based on the IEEE 802.11e standard and a network coding method. The proposed priority control scheme which controls AIFSN or CW_<min> of wireless stations (STAs) improves the VoIP transmission quality and throughput performances of data transmission. Computer simulations show that the proposal schemes achieve the lower packet loss rate and delay for VoIP transmission and better uni-directional throughput performances of data transmission, compared with the conventional CW_<min> control scheme for an access point (AP) and a relay station (RS).

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  • A Multimode MIMO Successive Detector

    OHTA Tomoya, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   111 ( 13 )   1 - 6   2011.4

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    Nowadays, cognitive radio draws attention because it can raise frequency utilization efficiency. For the cognitive radio, multimode receivers are required to make use of the empty frequency bands. On the other hand, MIMO spatial multiplexing is also focused on to increase transmission capacity. Moreover, the MIMO-MMSE receiver has been applied to the multimode reception. However, it is well known that performances of the MMSE filter is inferior to those of the other techniques. This paper proposes the structure of multimode MIMO-OSD receiver based on the heterodyne reception in order to improve BER performances. As a result of computer simulation, the proposed receiver can achieve superior BER performances even in the presence of strong imageband interference signals, and attain convergence within 200 symbols.

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  • B-21-19 Performance Improvement of VoIP Transmission for Wireless Relay CSMA/CA System by Network Coding

    Nakato Yuki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2011 ( 2 )   675 - 675   2011.2

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  • B-5-7 A High Speed Transmission Scheme using Parallel FFT Equalization in Fast time-varying Multipath Fading Channels

    Isogai Taiki, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2011 ( 1 )   393 - 393   2011.2

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  • B-20-26 A Proposal of Coexistence Scheme between WLAN and Wireless Sensor Network

    Fujii Yohei, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2011 ( 2 )   621 - 621   2011.2

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  • B-5-93 Study of Clustering Schemes for Multi-user MIMO Distributed Antenna Systems

    Nakahira Toshiro, Matsusaka Masahiro, Murata Hidekazu, Yamamoto Koji, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2011 ( 1 )   479 - 479   2011.2

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  • B-5-83 Study of Optimal Cyclic Prefix Length in Multi-User Distributed Antenna System

    Kobayashi Masahiro, Yamamoto Koij, Murata Hidekazu, Yoshida Susumu, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2011 ( 1 )   469 - 469   2011.2

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  • B-8-31 A Study of Physical-Layer Network Coding by Coherent CoMP

    Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Yamamoto Koji, Murata Hidekazu, Yoshida Susumu

    Proceedings of the IEICE General Conference   2011 ( 2 )   280 - 280   2011.2

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  • B-5-95 Virtual Layered Space Time Receivers for 16QAM Modulation

    Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2011 ( 1 )   481 - 481   2011.2

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  • B-21-21 Evaluation of CSMA/CA Protocol in Long Distance Wireless Communication

    Tanaka Masaaki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2011 ( 2 )   677 - 677   2011.2

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  • B-21-20 A Study of CSMA/CA Incorporating Packet Aggregation and Network Coding

    Sangenya Yuki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2011 ( 2 )   676 - 676   2011.2

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  • Channel Capacity of Two-Way Relay Channel by CoMP Physical-Layer Network Coding

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, YAMAMOTO Koji, MURATA Hidekazu, YOSHIDA Susumu

    IEICE technical report   110 ( 441 )   7 - 12   2011.2

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    In this manuscript, a physical-layer network coding (PNC) scheme, CoMP-PNC, is proposed for wireless distributed networks with coherent coordinated multi-point (CoMP). Wireless relaying could be done to reduce the transmission power of wireless stations in a CoMP cluster in which the carrier frequency and phase are synchronized at destination stations whereas the channel capacity will be reduced in the conventional wireless relaying due to the increase of number of hops. A CoMP-PNC scheme incorporating preceding and modulo encoding is applied for two-way relay channels in a CoMP cluster. The channel capacity is formulated for 802.11a/g-based orthogonal frequency division multiplexing and quadrature amplitude modulation (OFDM-QAM) singals in indoor environments.

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  • A Study of Introducing Distributed Transmit Power Control to Distributed Antenna System

    KUMAGAWA Shigemasa, YAMAMOTO Koji, MURATA Hidekazu, YOSHIDA Susumu, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   110 ( 433 )   73 - 78   2011.2

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    Multi-user distributed antenna systems are studied to build wide area coverage radio communication systems under restriction on transmit power. To decrease transmit power, this paper proposes a power control algorithm for single-user distributed antenna systems as an initial study. The proposed algorithm is based on the Foschini-Miljanic's power control algorithm which is one of the most famous algorithm on distributed power control. This is because multi-user distributed antenna systems consist multiple CoMP clusters of base station antennas and mobile stations, and interference between CoMP clusters should be controlled in a decentralized way. A degree of freedom of transmit power on each base station antenna still exists because the proposed algorithm is only based on the SINR. In addition, the convergence condition for the proposed power control is derived. The performance of extended algorithm is evaluated through computer simulations.

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  • Transmit Power Analysis of Precoded Multi-user Distributed Antenna Systems

    NAKAHIRA Toshiro, MATSUSAKA Masahiro, MURATA Hidekazu, YAMAMOTO Koji, YOSHIDA Susumu, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   110 ( 433 )   79 - 84   2011.2

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    In distributed antenna system (DAS), spectrum efficiency can be improved by using multiuser MIMO techniques. The computational complexity at mobile stations can be reduced by precoding techniques with channel state information. To extend DAS, BSs and MSs should be properly grouped into control clusters in order to reduce the computational complexity. Interference among clusters and the required transmit power depend on the clustering patterns. In this paper, a clustering method is proposed in order to reduce the transmit power. The performance of the proposed method is examined through computer simulations.

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  • Complexity Reduced Lattice-Reduction-Aided Receiver with Virtual Channel for MIMO-OFDM Systems

    YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 368 )   67 - 72   2011.1

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    A lattice-reduction-aided receiver with virtual channel detection that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel has been proposed. The receiver uses a lattice-reduction scheme and a concept of virtual channel detection is applied in order to detect signals under the above condition. In this manuscript, Orthogonal Frequency Division Multiplexing is applied to the lattice-reduction-aided receiver with virtual channel detection and we propose a way to reduce the computational complexity when lattice-reduction scheme is performed to virtual channels.

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  • Study of STBC Based Cooperative Relaying System Using Network Coding

    MIMURA Tomohiko, MURATA Hidekazu, YAMAMOTO Koji, YOSHIDA Susumu, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   110 ( 339 )   91 - 95   2010.12

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    In multi-hop cooperative communication systems, multiple relay stations which are located between the source and destination stations transmit a packet cooperatively. Transmission quality can be improved by the transmit diversity gain. Recently, theoretical analysis, computer simulations and field trials are reported. On the other hand, network coding can improve channel efficiency in two-way relay transmission. By introducing network coding into multi-hop cooperative communication systems, packets can be transmitted bidirectionally and effectively. In this study, several relay control schemes are investigated by computer simulations.

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  • A Simple Compensation Scheme on Performance of IEEE 802.11 DCF

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, OTSUKI Nobuaki, SUGIYAMA Takatoshi

    IEICE technical report   110 ( 269 )   29 - 34   2010.11

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    In this manuscript, a simple and accurate estimation on performance of IEEE 802.11 distributed coordination function (DCF) is presented. The performances obtained from Bianchi's analytical model of IEEE 802.11 DCF are compensated by means of (1) the number of consecutive successful packet transmissions and (2) the deferred slot time. The compensated performances including throughput, packet loss rate, and the average number of packet transmissions approximate to the simulation results with a high degree of accuracy under a number of conditions even when the minimum contention window is extremely small. As a result, the proposed estimation can be exploited to optimize the medium access control (MAC) parameters of IEEE 802.11 such that the throughput is maximized subject to a variety of QoS constraints.

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  • Performance analysis of CSMA/CA protocol in long distance wireless access

    IEICE technical report   110 ( 253 )   97 - 102   2010.10

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  • The Performance of Lattice-Reduction-Aided Receiver with Virtual Channel Detection for MIMO Spatial Multiplexing

    YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 251 )   199 - 204   2010.10

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    A lattice-reduction-aided receiver with virtual channel detection that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel has been proposed. The receiver uses a lattice-reduction scheme and a concept of virtual channel detection is applied in order to detect signals under the above condition. The performance and the computational complexity of the receiver is shown by using numerical simulations.

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  • Virtual Layered Space Time Receivers for 16QAM Modulation

    IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 251 )   187 - 191   2010.10

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    In the down-link for mobile communications, there has been probrem that spatial multiplexing is limited because mobile terminal should be small while the number of receiving antenna restricts quantities of streams which can be multiplexed. Therefore, an architecture has been proposed which can decode transmitted PSK modulated signals when the number of transmitting streams ecxeeds the number of receiving antenna. This receiver utilize the idea called virtual channels which can double the number of antennas at the receiver virtually. In this manuscript, we introduce how to apply the idea called virtual channels to QAM modulated signals and compare various detection scheme by showing their BER performance and complexity of calcuration. Moreover, we propose additional scheme to improve BER performance of this detection scheme. The performance of the introduced architecture is verified using computer simulations.

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  • A High Speed Transmission Scheme with Multilevel Modulation

    ISOGAI Taiki, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 251 )   211 - 215   2010.10

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    Distortion cancellation for FFT (Fast Fourier Transform) equalizers in fast fading channels was proposed. The distortion canceller is designed to anticipate the fading distortion by subtracting a based channel impulse response from the channel impulse response. Then it eliminates the distortion from the received signal in order to apply the FFT equalizer. And by making this proposed circuit parallel, the BER (Bit Error Rate) performance was improved. We propose another parallel distortion cancellation scheme and show that BER leads to more than 5dB degradation in E_b/N_0 on BER=10^<-7> for multilevel modulations like 16QAM and 64QAM.

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  • B-5-25 A Virtual Layered Space Receiver for QAM Modulation

    Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2010 ( 1 )   379 - 379   2010.8

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  • B-5-26 The Performance of Lattice-Reduction-aided Real Spatial Filter with Virtual Channel Detection for MIMO Spatial Multiplexing

    Yoshikawa Shogo, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2010 ( 1 )   380 - 380   2010.8

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  • Analysis of impacts of propagation delay on long distance access with IEEE802.11 CSMA/CA

    IEICE technical report   110 ( 129 )   1 - 6   2010.7

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  • Invited talk: Studies on random access based wireless network coding: from slotted ALOHA to CSMA/CA

    IEICE technical report   110 ( 129 )   69 - 74   2010.7

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  • Complexity Reduced Detection For Virtual Layered Space Time Receivers

    OHNISHI Ryota, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 77 )   97 - 102   2010.6

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    In this paper, we introduce, a new method named "Complexity Reduction Method based on Compensation Distance" in order to reduce the complexity of the detection in virtual layered space-time receivers in multiple-input multiple-output (MIMO) systems. Moreover, this method is practical even when the number of transmitting streams is greater than that of receiving antennas. Computer simulations indicate that the proposed method can be used to reduce the complexity of detection to approximately 20% in [8×4] (the transmitter is equipped with 8 antennas and the receiver is equipped with 4 antennas) systems.

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  • Iteration Schemes on Soft Information for Virtual Layered Space-Frequency Receivers

    IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 77 )   13 - 18   2010.6

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    Generally, spatial multiplexed signals cannot be applied successfully by the space filaters when the number of transmitting streams exceeds that of receiving antennas. The idea called "virtual channel" is proposed which enabels the decoding of MIMO-OFDM signals when the successive detector is applied. Additionally, iteration schemes on soft informations are effective for the virtual channel estimation. In this paper, we show some performances of the iteration schemes when the various rate and constraint length is used.

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  • Lattice-Reduction-aided MMSE Receiver with Virtual Channel Detection for MIMO Spatial Multiplexing

    YOSHIKAWA Shogo, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   110 ( 77 )   103 - 107   2010.6

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    This paper proposes an MMSE receiver architecture that can provide high performance when the number of antennas at the receiver is smaller than the number of signal streams multiplexed in the MIMO channel. The proposed receiver involves the use of a virtual channel and can detect signals under the above condition. Furthermore, the performance is improved by adopting the lattice-reduction scheme to the virtual channel. Numerical simulations show that the performance of this scheme is comparable to that of the maximum likelihood detection when the number of transmit antennas is twice that of receiving antennas.

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  • Performance of multimode receivers dependent on frequency response of Hilbert transformer and equalization of the response

    HOMMA Hiroaki, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   110 ( 41 )   95 - 100   2010.5

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    A heterodyne receiver with the Hilbert transformer is in principle known to cope with signals in arbitrary frequency bands. Moreover, the dual frequency conversion has been proposed to mitigate the interference due to the imperfection of actual Hilbert transformers. This paper evaluates the performance of the receiver where the frequency response of the desired band differs from that of the image band. Furthermore, we propose a moved scheme to improve the performance. The proposed scheme consists of the estimation of the Hilbert transformer's imperfection and the baseband linear filtering. Computer simulation shows that the proposed scheme achieves by 9dB better BER performance than the conventional scheme when CIR (Carrier-to-Interference Ratio) is -60dB and BER is 10'.

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  • B-8-26 Initial Acquisition Algorithm of Channel State Detection for Indoor Power Line Communications

    Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 2 )   289 - 289   2010.3

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  • B-21-18 Throughput Maximization Matched with Link Quality for Wireless Relay Slotted ALOHA Systems with Network Coding

    Takei Kaori, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2010 ( 2 )   668 - 668   2010.3

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  • B-20-36 Throughput Evaluation of IEEE 802.15.4 Unslotted CSMA-CA

    Fujii Yohei, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2010 ( 2 )   620 - 620   2010.3

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  • B-21-15 Throughput Enhancement with AIFS Control for Wireless Relay Systems

    Nakato Yuki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2010 ( 2 )   665 - 665   2010.3

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  • B-5-18 Performance of multimode receivers dependent on frequency responce of Hilbert transformer and equalization of the responce

    Homma Hiroaki, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   450 - 450   2010.3

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  • B-5-40 Complexity Reduced Decoding For Virtual Layered Space Time Receivers

    Ohnishi Ryota, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   472 - 472   2010.3

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  • B-5-17 A Study on Necessary Bit Number of A/D Converter for Multi-mode Receivers with Baseband AGC

    Liu Ke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   449 - 449   2010.3

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  • B-5-52 The Improvement Scheme for Complexty-Reduced Multi-Band MMSE-MIMO Receiver

    Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   484 - 484   2010.3

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  • B-5-39 Performance of the Iterative Virtual Channel Detection for MIMO-OFDM Systems

    Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   471 - 471   2010.3

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  • B-5-47 Lattice-Reduction aided MMSE Receiver with Virtual Channel Estimation for MIMO Spatial Multiplexing

    Yoshikawa Shogo, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2010 ( 1 )   479 - 479   2010.3

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  • B-21-16 Effects of RTS/CTS on Long Distance Access with CSMA/CA

    Tanaka Masaaki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2010 ( 2 )   666 - 666   2010.3

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  • B-21-17 Throughput Analysis of Wireless Multihop CSMA/CA System with Network Coding

    Huang Chun-hsiang, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2010 ( 2 )   667 - 667   2010.3

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  • Iterative Detection with Soft Input for Virtual Layered Space-Frequency Receivers

    IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   109 ( 341 )   95 - 100   2009.12

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    When the MIMO spatial multiplexed signals are decoded, conventional successive detector requires the same number of antennas at the receiver as that at the transmitter. In addition, the number of antennas that can be installed in the mobile terminals is limited. For these reason, in the down-link for mobile communication, it has been difficult to increase transmission capasity by spatial multiplexing. Therefore, the architecture has been proposed which can decode transmitted signals when the number of antennas at the transmitter ecxeeds that of at the receiver. This receiver can double the number of antennas at the receiver virtually. In this manuscript, we propose a soft input iteration scheme for improvement of this architecture. The performance of the proposed architecture is verified using computer simulations.

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  • Configulation and Performance of Multiband MIMO-MMSE Receiver

    TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   109 ( 341 )   101 - 106   2009.12

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    Various radio transmission systems have recently been commercialized. So, multiband/mode receiver which enable one RF chain to receive some frequency band is important. We proposed an architecture of MIMO receiver which enable multiband reception. It can simultaneously signal devision and cancel image-band interference. We adopt analogue Hilbert transformers to cancel image-band interference and MMSE criterion to devide MIMO signals. We also show performance of the proposed system by computer simulation. As a result, image-band interference can caused by some imperfection of Hilbert transformer can be completely canceled. Moreover, scheme of complexity reduction can be appeared.

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  • Throughput Optimization by Contention Window Control in CSMA/CA Network Coding

    HUANG Chun-hsiang, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report. Information networks   109 ( 276 )   47 - 52   2009.11

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    In this paper, a network coding method in which a QoS control is incorporated is proposed to improve the system throughput of a two-hop wireless CSMA/CA relay network. In the case of non-QoS control, when many terminal stations transmit their data frames to each other via only one relay station, the wireless channel is dominated by the uplink from the terminal stations to the relay station. As a result, it deteriorates the system throughput because the relay station can hardly obtain the transmission right on such a wireless channel, and the wireless link from the relay station to the terminal stations will become a bottleneck. As a solution of this phenomenon, we propose the method of modifying the minimum contention window size in the relay station to provide its transmission priority. Furthermore we show that the proposed method improves the system throughput both with and without network coding by computer simulation.

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  • Thoroughput Evaluation of One-to-Many Wireless Relay ALOHA Network Coding Incorporating Link Budget

    TAKEI Kaori, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report. Information networks   109 ( 276 )   59 - 64   2009.11

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    Wireless multihop networks have been studied for the purpose of solution of digital divide and system capacity enhancement. On the other hand, a network coding scheme has attracted attention as a technology for throughput enhancement. In this paper, we clarify how noise and interference have effects on system throughput performances for two-hop wireless relay slotted ALOHA systems in the cases with and without network coding under one-to-many information sharing via the relay node. As a result, the throughput performances of one-to-many information sharing systems via the relay mode in the noise and interference environments can be evaluated analytically. In particular, we show the design criterion of the relay transmission probability for maximizing the throughput of systems with network coding.

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  • A Relay Packet Transmission Control Scheme for Multihop Wireless ALOHA Network Coding

    TANAKA Masaaki, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report. Information networks   109 ( 276 )   53 - 58   2009.11

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    Wireless access systems employing wireless relay nodes have been studied for removing degital devides and blind zone areas. On the other hand, network coding is a highly regarded technology to enhance the system throughput and to decrease the delay for wireless relay networks. In this manusprict, we propose a packet collison avoidance scheme for the relay nodes in which predetermined slots are assigned to the relay nodes to avoid any packet collisons between relay nodes. We evaluate throughput and delay of the coding packet transmission control schemes with the proposed packet collison avoidance scheme, and show that the proposed schemes can achieve lower delay as compared with the conventional schemes when throughput is higher. Also, we show that the poposed schemes can update higher throughput and lower delay by adapting the parameters of the proposed schemes to the previous throughput.

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  • RTS/CTS Effect on Two-Hop Wireless CSMA Network Coding

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report. Information networks   109 ( 276 )   65 - 70   2009.11

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    Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In the previous presentation, we evaluated the throughput in both cases of non-hidden end nodes and hidden end nodes via the relay node for two-hop wireless relay systems, in which all nodes employ CSMA (Carrier Sense Multiple Access) protocol, both without and with network coding. In this manuscipt, we investigate the effect of the RTS/CTS (Request To Send/Clear To Send) mechanism on throughput in case of hidden end nodes via the relay node by applying the PPDU (PLCP Protocol Data Unit) frame format, the IFS (Interframe Space) time, and the slot time of IEEE802.11a, where PLCP is the abbreviated form of Physical Layer Convergence Protocol. As the analytical result, we clarify that the high conding gain can be achieved by RTS/CTS and network coding regardless of the increase of the overhead.

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  • Performance Evaluation of Network Coding in Two-Hop Wireless CSMA Systems

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   109 ( 189 )   29 - 34   2009.9

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    Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In this manuscript, we analyze the throughput in two-hop wireless access systems, in which nodes employ CSMA (carrier sense multiple access) protocol, both without and with network coding. As a result, we clarify a design criterion on transmit probability of the relay node to maximize the throughput and investigate the coding gain of the systems with network coding against those without network coding. In particular, we evaluate the performances without and with hidden nodes and estimate the affect on throughput degradation due to hidden node problem.

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  • B-5-7 Improvement of Error Estimation Accuracy of Hilbert Transfer for Multi-mode Receivers with Baseband AGC

    Liu Ke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2009 ( 1 )   356 - 356   2009.9

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  • B-8-33 An Improvement of Code Rate Optimization for Bit Loaded OFDM in Power Line Communications

    Yabuuchi Yasuhiro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   174 - 174   2009.9

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  • B-7-56 Analysis of Network Coding for Two-Hop Wireless CSMA Systems Enabled Carrier Sense

    Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   124 - 124   2009.9

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  • B-7-57 Effect of Noise and Interference on Asymmetric Node Number Model Using Wireless Network Coding

    Takei Kaori, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   125 - 125   2009.9

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  • B-7-58 Effect of Packet Length Asymmetry on Wireless CSMA/CA Network Coding

    Huang Chun-hsiang, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   126 - 126   2009.9

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  • B-7-55 A Study on Delay Performance of 3-hop Wireless Relay System Employing Network Coding

    Tanaka Masaaki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   123 - 123   2009.9

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  • B-5-86 Iterative Detection with Soft Input for Virtual Layered Space-Frequency Receivers

    Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2009 ( 1 )   435 - 435   2009.9

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  • Image-band Interference Cancellation for Multi-mode/band Receivers with Baseband AGC

    LIU Ke, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   109 ( 155 )   119 - 124   2009.7

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    An algorithm to cancel the image-band interference for Multi-mode/band receivers with baseband AGC is proposed in this paper. The algorithm proposed here estimates the phase error and the amplitude error of the analog Hilbert transformer with correlation matrices. Furthermore, filtering is employed here to improve the estimation accuracy. This paper also shows the error estimation performance of the proposed algorithm and the BER of the interference cancellation by computer simulation under the circumstance of CIR=-20dB, and compares them with that of the conventional algorithm.

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  • Analysis of Two-hop CSMA/CA Wireless Relay Network with Network Coding

    HUANG Chun-hsiang, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   109 ( 119 )   67 - 72   2009.7

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    The method of wireless access is introduced to construct access networks in the circumstances that wiring network is intractable. Network coding is a highly regarded technology to enhance system capacity of wireless relay networks. By coding and transmitting packets from different sources at the relay station, the system is able to achieve higher throughput. In this manuscript, we propose an analytical model to compute the throughput of a two-hop wireless relay network in which stations employ CSMA/CA protocol and network coding on their MAC layer. We also confirm the difference between the results of theoretical analysis and computer simulations are negligibly small.

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  • Effect of Buffer Capacity on Network Coding for Two-Hop Wireless ALOHA Systems

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   109 ( 119 )   73 - 78   2009.7

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    Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In this manuscript, we analyze the effect of finite buffer capacity on throughput and packet delay for two-hop wireless access systems both without and with network coding in which the nodes employ a slotted ALOHA protocol. We show that the buffer capacity is not relevant with the throughput for the assumed two-hop wireless network if network coding is not applied. On the other hand, we crarify that the buffer capacity has a significant impact on achievable throughput enhancement if network coding is applied.

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  • Effect of Noise and Interference on Asymmetric Traffic Model Using Wireless Network Coding

    TAKEI Kaori, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   109 ( 119 )   79 - 84   2009.7

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    Wireless multihop networks have been studied for the purpose of solution of digital divide and system capacity enhancement. On the other hand, a network coding scheme has attracted attention as a technology for throughput enhancement. In this paper, we crarify how noise and interference have effects on system throughput performances for two-hop wireless relay slotted ALOHA systems in the cases with and without network coding under asymmetric traffic environments. As a result, the throughput performances of the asymmetric traffic models in the noise and interference environments can be evaluated analytically. In particular, we show the design criterion of the relay transmission probability for maximizing the throughput of systems with network coding.

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  • A Detection Method of Channel States for Periodically Time Variant Channels over Indoor Power Line

    WATANABE Keita, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   109 ( 116 )   53 - 58   2009.6

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    In this manuscript, we propose an initial acquisition method for detecting channel states on in-home broadband power line communication. It has been considered that the time fluctuation in the transfer function has been smaller than that in the noise on the in-home broadband PLC. However, we have observed that the extensively and rapidly time fluctuation across the whole frequency band appears in the in-home PLC at the half of power cycle intervals while connecting some switching power supply devices. Such largely and quickly time fluctuation makes the extensive degradation in performance of in-home PLC. Therefore, we should estimate the timing of time fluctuation and synchronize the in-home PLC systems with the estimated time fluctuation. We evaluate the performance of the proposed initial acquisition method under impulsive noise environments. As a result, we show that the proposed method can achieve the requirement for communication reliability.

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  • A Subcarrier CNR Estimation for Powe Line Multicarrier Communication

    YABUUCHI Yasuhiro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   109 ( 116 )   47 - 52   2009.6

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    Indoor power line communication (PLC) is an attractive way to realize an in-home network. The bit-loaded orthogonal frequency division multiplexing (OFDM) is effective for PLC to achieve high bit rate by optimizing subcarrier modulations and code rate of a forward error correcting (FEC) code. The precise CNR information for each subcarrier should be estimated for achieving high bit rate. In particular, the subcarrier CNR information should be done within a short pilot symbol length because streaming services of voice and video are provided on in-home PLC. At first, this manuscript shows that the precise subcarrier CNR estimation for all the range of SNR cannot be achieved within the target pilot symbol length. Next, we propose three methods to achieve target BER within the target pilot-symbol length. First one is to smooth the estimated subcarrier CNR curve, second one is to give a margin of subcarrier CNR threshold for determining subcarrier modulation, and last one is to minimize the estimated subcarrier CNR locally. As a result of evaluating these three proposed methods, it is shown that the local minimization can achieve the best performances among them. Furthermore, we show the relationship between the pilot symbol length and the range of local minimization.

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  • Performance Analysis of Wireless ALOHA Network Coding for Two-Hop Bidirectional Traffic

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   109 ( 37 )   13 - 18   2009.5

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    Wireless access systems employing wireless relay nodes have been studied for removing digital divides and blind zone areas. In this manuscript, we analyze the group throughput and group packet delay for two-hop wireless access systems with one relay node in which slotted ALOHA protocol and network coding are applied to nodes. Furthermore we clarify an achievable region in slotted ALOHA throughput for one-relay two-hop wireless access systems regardless of whether the buffer in the relay node is saturated or not.

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  • Performance of Successive Detection Architecture with Virtual Channels for MIMO-OFDM Systems

    IMAMURA Jun, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   109 ( 38 )   13 - 18   2009.5

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    When the MIMO spatial multiplexed signals are decoded, conventional successive detector requires the same number of antennas at the receiver as that at the transmitter. In addition, the number of antennas that can be installed in the mobile terminals is limited. For these reason, in the down-link for mobile communication, it has been difficult to increase transmission capasity by spatial multiplexing. Therefore, the architecture has been proposed which can decode transmitted signals when the number of antennas at the transmitter ecxeeds that of at the receiver. This receiver can double the number of antennas at the receiver virtually. In this manuscript, we apply this architecture to OFDM-QPSK modulated signals and propose some schemes for improvement of this architecture. The performance of the proposed architecture is verified using computer simulations.

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  • B-8-5 Initial Acquisition Algorithm for Channel Synchronization in Power Line Communications

    Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2009 ( 2 )   271 - 271   2009.3

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  • B-7-11 Analysis of Wireless Relay Slotted ALOHA Network Coding Employing Poisson Traffic

    Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2009 ( 2 )   155 - 155   2009.3

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  • B-5-16 Performance of Successive Detection Architecture with Virtual Channels for MIMO-OFDM Systems

    Imamura Jun, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2009 ( 1 )   449 - 449   2009.3

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  • B-7-8 System Thoroughput for Wireless Multihop Access System Employing Network Coding

    Takei Kaori, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Otsuki Nobuaki, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2009 ( 2 )   152 - 152   2009.3

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  • B-7-9 3-hop Wireless Relay Slotted ALOHA System Employing Network Coding

    Tanaka Masaaki, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2009 ( 2 )   153 - 153   2009.3

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  • B-5-64 The Scheme of Complexty-Reduction for Adaptive Multi-Band Array

    Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the IEICE General Conference   2009 ( 1 )   497 - 497   2009.3

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  • B-5-17 Successive Receiver with Coded Virtual Channel for Layered Space Time Communications

    Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   2009 ( 1 )   450 - 450   2009.3

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  • B-5-50 Analysis of OFDM Communication Systems in Fast Fading Channels

    AOKI Ippei, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    Proceedings of the IEICE General Conference   2009 ( 1 )   483 - 483   2009.3

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  • B-7-10 Proposals of Relay Control Scheme for CSMA/CA system with Wireless Network Coding

    Huang Chunhsiang, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the IEICE General Conference   2009 ( 2 )   154 - 154   2009.3

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  • Performance Analysis of Succesive Receiver Architecture with Virtual Channel Detection for MIMO Spatial Multiplexing

    MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   108 ( 445 )   113 - 118   2009.2

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    MIMO spatial multiplexing system requires same number of receiving antennas or more than transmitting antennas. Our proposed successive receiver can double the number of receiving antennas virtually. Therefore the receiver can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. In this manuscript, the effects of factors in the proposed receiver on system error rate are evaluated. In addition, we propose phase sequence coding in order to improve performance of the receiver. Then, it is evaluated that phase sequence coding can improve bit error rate performance of the proposed receiver.

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  • Analysis of OFDM Communication System in Time-Varying Fading Channels

    AOKI Ippei, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   108 ( 445 )   349 - 354   2009.2

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    With OFDM (Orthogonal Frequency Division Multiplexing) communication system, the BER (Bit Error Rate) quality is good in multi-path fading channels, but the quality gets worse markedly in fast fading channels that the fading change is very fast. So we evaluate the parallel OFDM demodulation method. In the method, we demodulate OFDM symbols with the channel impulse responses of different time and select the reasonable symbols from the demodulated symbols and correspond. And we propose the two distortion cancellation methods of cancelling the fading change with the symbols demodulated. The one method is the parallel time domain distortion canceller. With the method, we cancell directly the chanege that the received signals has. The next one is the parallel frequency domain distortion canceller. With the method, after we do FFT (Fast Fourier Transform) the received signals, we cancell the interference. We evaluate these qualties with the computer simulation.

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  • A Challenge for Multimode Receivers with An RF Receiver Chain : A dual frequency conversion heterodyne receiver

    DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   108 ( 400 )   43 - 48   2009.1

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    We have investigated on a multimode/multiband receiver with an RF receiver chain. Basically, an RF band pass filter at the RF front end prevents multimode/band communications because of little flexibility of the BPF. Therefore, we have tried to design multimode/multiband receivers with an ultra wide band RF BPF. While pass-band of the RF-BPF is widened, an IF-BPF with relatively narrow pass-band is applied in the receiver, which is so called "heterodyne receiver". As is known, however, the heterodyne receiver with the ultra wide band RF BPF suffers from severe image-band interference. Therefore, we have proposed dual frequency conversion heterodyne receiver with some image-band interference cancellers to overcome the problem. In this report, principle of image-band interference cancellation is briefly explained and challenges for implementing the imageband interference cancellers are described.

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  • Throughput Enhancement with OFDMA on In-home Power Line Communications

    HAYASAKI Taro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   108 ( 394 )   43 - 48   2009.1

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    The in-home broadband power line communication (PLC) is drawing attention to us lately. The broadband PLC has regulation issues for the coexistence with shortwave wireless systems. Therefore, orthogonal frequency division multiplexing (OFDM) is adopted for the broadband PLC. On the other hand, the power line channels suffer from frequency selective fading. It is effective to load appropriate bits on each subcarrier in the OFDM for PLC. In this paper, we propose a bit loading algorithm that maximizes the bit rate by optimizing not only the bit quantity on each subcarrier but also the whole code rate of the forward error correction (FEC) code subject to constraints on the total bit error rate (BER) and power on each subcarrier. Furthermore, we investigate orthogonal frequency division multiple access (OFDMA) as a multiple access scheme on the in-home power line networks. We show that the proposed OFDMA scheme is superior to a time division multiple access (TDMA) scheme from the viewpoint of throughput by computer simulations.

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  • Consideration on Iterative Decoding of M-ary Modulation Signals over Hidden Markov Noise Channels

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   108 ( 394 )   13 - 17   2009.1

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    The indoor power line communication (PLC) suffers from impulsive noise generated by home appliances. The impulsive noise can be described as the bursty noise among several symbols for high-rate PLC employing M-ary modulation. Such bursty and impulsive noise can be widely applied as noise on a hidden Markov model for high-rate PLC. In this manuscript, we investigate the iterative decoding of M-ary modulation signals over hidden Markov noise channels. We evaluate the iterative decoding performance for structured LDPC codes, which are exploited for the digital broadcasting standard DVB S.2 of ETSI, and M-ary QAM (quadrature amplitude modualtion) signals. We clarify the importance of detecting metric for hidden Markov noise channels and investigate the difference between Gray mapping and binary mapping in decoding performance and the effectiveness of bit interleaver.

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  • Consideration of Initial Acquisition Method for Channel Synchronization on In-home Power Line Communications

    WATANABE Keita, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   108 ( 394 )   37 - 42   2009.1

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    In this paper, we propose an initial acquisition method for channel synchronization on in-home broadband power line communication (PLC). It has been considered that the time fluctuation in the transfer function has been smaller than that in the noise on the in-home broadband PLC. However, we have observed that the extensively and rapidly time fluctuation across the whole frequency band appears in the in-home PLC at the half of power cycle intervals while connecting some switching power supply devices. Such largely and quickly time fluctuation makes the extensive degradation in performance of in-home PLC devices. Therefore, we should estimate the timing of time fluctuation and synchronize the in-home PLC systems with the estimated time fluctuation. We evaluate the performance of the proposed initial acquisition method under impulsive noise environments and investigate its feasibility for the real in-home PLC.

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  • Consideration on Delay Performances of Wireless Relay Slotted ALOHA Network Coding Systems

    HIRANO Tomoya, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   108 ( 342 )   79 - 84   2008.12

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    Wireless multihop networks have been studied for the purpose of system capacity enhancement and solution of digital divide. On the other hand, network coding is a recent and highly regarded technology for throughput enhancement on wireless multihop networks. In this manuscript, we propose a coding timeout control scheme which can enhance the throughput and reduce the delay for wireless relay slotted ALOHA systems with network coding. We evaluate the throughput and delay of the proposed scheme and compare them with these of an equal control scheme which does not distinguish the coding and native packets in the relay node. As a result of computer simulation we show that the coding timeout control scheme which selects the timeout values adaptively with throughput of the relay node is superior to a equal control scheme in delay performances.

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  • Throughput Analysis of Network Coding on Wireless Relay Slotted ALOHA Systems

    UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   108 ( 342 )   73 - 78   2008.12

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    Wireless relay access networks have been studied for removing digital devides and deploying disaster information networks with low cost. Network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless relay networks. In this manuscript, we analyze the throughput of network coding in slotted ALOHA for 2-hop wireless relay systems taking consideration on packet error rate (PER).

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  • Adaptive Multi-Band Array for Cancelling Co-Channel Interference and Image-Band Interference

    TAMAOKI Masahiro, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   108 ( 305 )   71 - 76   2008.11

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    Various radio transmission systems have recently been commercialized. So, multiband/mode receiver which enable one RF chain to receive some frequency band is important. We proposed an architecture which reduce the circuit size to concurrently cancel co-channel interference and image-band interference. We adopt analogue Hilbert transformers to cancel image-band interference and adaptive array antenna to cancel co-channel interference. Furthermore, we can miniaturize the receiver by mixing all signals at the IF stage and reduce complexty by new algorithm. We also show performance of the proposed system by computer simulation. As a result, image-band interference can caused by some imperfection of Hilbert transformer can be completely canceled. Moreover, co-channel interference can be simultaneously canceled.

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  • Achievable Region in Slotted ALOHA Throughput for Wireless Relay Network Coding

    UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   108 ( 258 )   25 - 30   2008.10

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    Wireless multihop networks have been studied for the purpose of system capacity enhancement. Network coding is a recent and highly regarded technology for system capacity enhancement on wireless relay networks. This manuscript clarifies an achievable region of throughput in slotted ALOHA applying network coding on two-hop wireless relay networks. As a result, we reveal the applicable scope of network coding.

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  • B-5-33 Adaptive Multi-Band Array for Canceling Co-Channel Interference and Image-Band Interference

    Tamaoki Masahiro, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   346 - 346   2008.9

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  • B-5-70 A Study on Decoding Algorithms for V-BLAST with Real Vetotor Weight

    Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   383 - 383   2008.9

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  • B-8-8 Study on a Bit Loading Algorithm for Indoor Power Line Communication

    Hayasaki Taro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2008 ( 2 )   131 - 131   2008.9

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  • B-8-9 Proposal of Synchronization Algorithm in Periodically Time-Variant Channels for Power Line Communications

    Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the Society Conference of IEICE   2008 ( 2 )   132 - 132   2008.9

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  • B-5-105 Performance Evaluation of Wireless Relay Network Coding under Heterolytic Traffic Environments

    Hirano Tomoya, Umehara Daisuke, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   418 - 418   2008.9

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  • B-5-106 Consideration on Delay of Wireless Relay Slotted ALOHA Network Coding

    Umehara Daisuke, Hirano Tomoya, Denno Satoshi, Morikura Masahiro, Sugiyama Takatoshi

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   419 - 419   2008.9

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  • Consideration on Relay Control Schemes of Wireless Relay Slotted ALOHA Network Coding Systems

    HIRANO Tomoya, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   108 ( 188 )   181 - 186   2008.8

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    Wireless multihop networks have been studied for the purpose of system capacity enhancement and solution of digital divide. On the other hand, network coding is a recent and highly regarded technology for throughput enhancement on wireless multihop networks. In this manuscript, we consider relay control schemes of relay node, for wireless relay network coding systems which adopt Slotted ALOHA as a media access control protocol. We propose a coding timeout control scheme, and compare it with a coding priority control scheme. As a result, we show that the proposed scheme can achieve higher throughput, lower delay, and lower variance of delay than the coding priority control sheme.

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  • Performance of Spatial Multiplexing Systems with Real Weight Vector

    MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   108 ( 188 )   31 - 36   2008.8

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    Spatial multiplexing system can achieve improvement in transmission capacity. Spatial multiplexing system requires the same number of transmitting antennas and receiving antennas for successful communication. The purpose of this study is to generate the "real weight algorithm" for spatial multiplexing system which can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. Performance of the real weight algorithms for BPSK and QPSK systems has been evaluated previously. In this paper, the algorithms are improved in order to increase performance.

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  • Analysis of Immediate Network Coding for Wireless Relay Slotted ALOHA Systems

    UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro, SUGIYAMA Takatoshi

    IEICE technical report   108 ( 134 )   1 - 6   2008.7

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    Wireless multihop networks have been studied for the purpose of system capacity enhancement. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless multihop networks. In this manuscript, we propose immediate network coding, which transmits the coding packets immediately if possible, for 2-hop wireless relay slotted ALOHA systems. We analyze the throuhput, the number of packet transmissions, and transmission delay of immediate network coding for 2-hop wireless relay systems with the naitive exclusive control and the coding priority control. Furthermore, we show that immediate network coding for the coding priority control can enhance the throughput if the transmit probability of the relay node is designed properly.

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  • Performance Analysis of an FFT Equalizer with Parallel Distortion Cancellation and Proposal for Performance Improvement

    HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   108 ( 135 )   1 - 6   2008.7

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    Distortion cancellation for FFT (Fast Fourier Transform) equalizers was proposed that mitigates degradation caused by fast fading. The FFT equalizer suppresses channel fluctuation of received signals, so the accuracy of the channel estimation considerably influences the performance of the FFT equalizer. Therefore, we propose a channel estimation by estimated transmitted signals for the parallel distortion cancellation. Besides, we analyze the degradation of FFT Equalizers for Parallel Distortion Cancellation in fast fading channel, and show the performance of the FFT equalizer with the proposed channel estimation by computer simulation.

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  • V-BLAST Detection Algorithm for Spatial Multiplexing Receivers with QPSK System

    MARUYAMA Hirofumi, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   108 ( 61 )   55 - 60   2008.5

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    Spatial multiplexing system can offer a high channel capacity. In spatial multiplexing, the system should have the same number of transmitting antennas and receiving antennas for successful communication. Our purpose is to propose algorithms for spatial multiplexing decoder which can decode transmitted signals even if the number of transmitting antennas exceeds that of receiving antennas. In this paper, we propose and evaluate a new algorithm for V-BLAST decoder on QPSK systems. The algorithm can increase the number of signal streams from transmitting antennas that can be decoded successfully at the same number of receiving antennas. As a result of this, the algorithm with QPSK systems can expand the transmission capacity.

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  • Analysis of Wireless Relay Network Coding under Heterolytic Traffic Environments

    UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   108 ( 60 )   19 - 24   2008.5

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    Wireless multihop networks have been studied for the purpose of system capacity enhancement. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless multihop networks. In this manuscript, we analyze the throughput, the number of packet transmissions, and transmission delay for 2-hop wireless relay slotted ALOHA systems with network coding under heterolytic traffic environments. Their analytical results can be derived by solving a queuing system for the state of buffer in the relay node.

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  • A Study on Network Coding for Wireless Relay Slotted ALOHA System

    UMEHARA Daisuke, HIRANO Tomoya, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   107 ( 518 )   151 - 156   2008.3

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    Wireless relay access networks have been studied for the purpose of system capacity enhancement, digital divide removal, etc. On the other hand, network coding has been the more recent and highly regarded as a technology of system capacity enhancement for wireless relay networks. However, the theoretical performance analysis of MAC (Media Access Control) layer for the system applying the network coding is still an open problem. In this manuscript, we analyze throughput, number of packet transmissions, and system delay for 2-hop relay slotted ALOHA systems without network coding and with network coding. Their analytical results can be derived by solving a queuing system for buffer in the relay node.

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  • Parallel Distortion Cancellation for FFT Equalizers in Fast Fading Channels

    HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIKURA Masahiro

    IEICE technical report   107 ( 518 )   233 - 238   2008.3

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    Distortion cancellation for FFT (Fast Fourier Transform) equalizers was proposed that mitigates degradation caused by fast fading. The distortion canceller suppresses fluctuation of received signals fed to the FFT equalizer by subtracting some signals. Even though, those signals are made of demodulated signals of the FFT equalizer convoluted with channel impulse response, the demodulated signals are too erroneous to suppress fluctuation which causes serious performance degradation in severe fading channels. This paper proposes parallel distortion cancellation for FFT equalizers which is able to improve the BER (Bit Error Rate) performance in fast fading channels. In this cancellation, channel matrixes made up of the impulse responses at different times are used for FFT equalization and suppression of the fluctuation. Finally, its BER performance is evaluated by computer simulation.

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  • B-5-66 Transmission Performance Evaluation of OFDM with a Deterministic Cancellation Matrix Estimation Scheme in Heterodyne Multimode Receivers

    Hayashi Daisuke, Denno Satoshi, Furuno Tatsuo, Morikura Masahiro

    Proceedings of the IEICE General Conference   2008 ( 1 )   452 - 452   2008.3

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  • B-8-23 A Simulator of In-home Power Line Channels Varying in Time Coincident with Power Cycle

    Hayasaki Taro, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2008 ( 2 )   266 - 266   2008.3

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  • B-5-85 Performance of Forward Error Correction in FFT Equalizers with Parallel Fading Distortion Canceller

    HASHIMOTO Koichiro, DENNO Satoshi, UMEHARA Daisuke, MORIHARA Masahiro

    Proceedings of the IEICE General Conference   2008 ( 1 )   471 - 471   2008.3

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  • B-8-24 Performance Evaluation of Variable Time Slot for Power Line Communications

    Watanabe Keita, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   2008 ( 2 )   267 - 267   2008.3

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  • Frequency Domain Equalization with Mitigation of Fast Fading Distortion

    FUJIMURA Yuki, UMEHARA Daisuke, DENNO Satoshi

    The IEICE transactions on communications B   91 ( 3 )   250 - 259   2008.3

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  • Bit Loading Algorithms Synchronized with Commercial Power Supply on In-home Power Line Multicarrier Communications

    HONDA Shinya, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   107 ( 463 )   43 - 48   2008.1

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    In-home PLC (Power Line Communicaiton) is one of the most attractive in-home networkings. However, there are a lot of technical issues for the realization of PLC with hight rate and high reliability. These issues include the influence of frequency selective and linear periodically time-variant (LPTV) channel synchronized with commercial power supply. In particular, we show that some kinds of switching power cevices impact deep and deterministic time selectivity for power line channels. The combination of OFDM (Orthogonal Frequency Division Multiplexing) and bit loading algorithm is a powerful tool to increase the bit rate or reliability for quasi-static frequency selective channels including power line channels. However, a quick response will be required for the execution of bit loading algorithm since power line channels are synchronized with commercial power supply. In this paper, we propose a fast bit loading algorithm based on the fractional knapsack algorithm to enhance the bit rate under the condition that the transmitted power is constant. Furthermore, we evaluate the achievable bit rate of the proposed algorithm for the SNR over a power line channel and compare it with the achievable bit rate based on water filling theory.

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  • The Influence of Compact AC Adapter on PLC Equipments

    UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   107 ( 463 )   55 - 60   2008.1

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    The regulation on power line communication (PLC) has been eased in Japan and the frequency band between 2 and 30MHz can be exploited for in-home PLC. Several commercial PLC equipments are available in the market. Almost all PLC equipments take on a form of PLC adapters interconverting Ethernet signals and power line signals. We can construct in-home network by these PLC adapters easily because there are many power outlets in every room. However there are various factors destabilizing the communication among PLC adapters. These factors involve time-varying channel responses and noise characteristics synchronized with commercial power supply. In particular, we present a number of examples of more significant variations of the channel response affected by compact AC adapters. In this report, we show that the PLC adapters suffer from the time-varying channel responses and analyze their influence on the communication quality of the PLC adapters.

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  • A Simulator of In-home Power Line Channels Affected by Switching Power Supply Equipments

    HAYASAKI Taro, UMEHARA Daisuke, DENNO Satoshi, MORIKURA Masahiro

    IEICE technical report   107 ( 463 )   49 - 54   2008.1

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    Indoor power line is one of the most attractive media for in-home networks. However there are many technical problems to achieve in-home power line communication (PLC) with high rate and high reliability. One of such the problems is degradation in performance of in-home PLC caused by periodically time-variant channel synchronized with commercial power supply when connecting switching power supply equipments. In this paper, we present a simulator of in-home power line channels affected by switching power supply equipments, and validate this simulator through performance evaluation of OFDM/64QAM under white Gaussian noise environments. Furthermore we evaluate the influence of periodically time-variant channel on communication quality by using the proposed simulator.

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  • A Deterministic Cancellation Matrix Estimation Scheme in Heterodyne Multimode Receivers

    HAYASHI Daisuke, DENNO Satoshi, FURUNO Tatsuo, MORIKURA Masahiro

    IEICE technical report   107 ( 439 )   55 - 60   2008.1

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    When we realize multimode receivers using heterodyne reception, the image-band interference arises and deteriorates transmission performance significantly because of removal of radio frequency filters. Therefore, cancellation methods using Hilbert transform have been proposed, however, this method cannot remove the interference completely because of imperfectness of the Hilbert transformer. Then, in this report, we propose a scheme to cancel imperfectness of the transformer with cancellation matrix in intermediate frequency. In this scheme, we use downconverion not only to receive the desired signal but also the image-band signal and estimate the cancellation matrix using correlation matrix of these two signals. We describe that this scheme has superior estimation and cancellation performance.

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  • B-5-192 Performance Evaluation of Network Coding for Slotted ALOHA Wireless Relay System

    Hirano Tomoya, Umehara Daisuke, Denno Satoshi, Morikura Masahiro

    Proceedings of the IEICE General Conference   578   578 - 578   2008

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  • B-5-74 Weight Generation Algorithm for V-BLAST Receiver with BPSK System

    Maruyama Hirofumi, Denno Satoshi, Umehara Daisuke, Morikura Masahiro

    Proceedings of the IEICE General Conference   460 - 460   2008

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  • B-5-24 Coded Fading Distortion Canceller for FFT Equalizers in Fast Fading Channels

    HASHIMOTO Koichiro, UMEHARA Daisuke, DENNO Satoshi

    Proceedings of the Society Conference of IEICE   2007 ( 1 )   346 - 346   2007.8

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  • Channel Capacity for Linear Periodically Time-variant Channels

    HONDA Shinya, UMEHARA Daisuke, DENNO Satoshi

    IEICE technical report   107 ( 142 )   7 - 12   2007.7

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    Indoor PLC (Power Line Communication) is one of the attractive in-home networkings. However, there are a lot of technical issues for the realization of PLC with high rate and high reliability. In this paper, we apply OFDM (Orthogonal Frequency Division Multiplexing) system to a linear periodically time-variant channel measured from an indoor power line channel. Furthermore, we propose a time-frequency adaptive modulation system in which multivariate QAM (Quadrature Amplitude Modulation) based on the pouring theory is allocated to each subcarrier. We evaluate channel capacities of the periodically time-variant, multiplexing, binary symmetric channels (BSCs) obtained from each adaptive modulation, Gray coding, additive white Gaussian noise, and symbol decision.

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  • B-8-3 Analysis of Noise Statistics for Indoor Power Line Multicarrier Communication

    Maehara Keiko, Umehara Daisuke, Denno Satoshi

    Proceedings of the IEICE General Conference   2007 ( 2 )   319 - 319   2007.3

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  • A Scheme for Adaptive Image-band Interference Cancellation with RLS Algorithm in Heterodyne Multimode Receivers

    HAYASHI Daisuke, FURUNO Tatsuo, DENNO Satoshi

    IEICE technical report   106 ( 477 )   1 - 6   2007.1

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    Multimode receivers is investigated to use number of wireless systems with one receiver. When we construct multimode receivers using heterodyne reception, the imageband interference arises and deteriorates transmission characteristics significantly because of removal of radio frequency filter. Therefore, cancellation methods have been heretofore proposed, but they have problems that convergence properties are not good. To solve this problem, we proposed a cancellation method with good convergence characteristics, in which we calculate the weighting addition of baseband signals of the desired signal and the imageband signals. We can apply this method in rayleigh fading channels, but we found that the bit-error rate characteristics will deteriorate. Then, in this report, I describe that we can realize a cancellation method which has good convergence properties without deterioration of the bit-error rate characteristics with using the RLS algorithm.

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  • CSK/PAM System Using Optimized Real-Valued Sequence on Power Line Communication

    UEYAMA Daisuke, UMEHARA Daisuke, DENNO Satoshi

    106 ( 450 )   1 - 6   2007.1

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    IZUMI Keita, UMEHARA Daisuke, DENNO Satoshi

    106 ( 450 )   7 - 12   2007.1

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  • B-5-87 A study on hardware implementation of heterodyne multimode receivers

    Hayashi Daisuke, Furuno Tatsuo, Denno Satoshi

    Proceedings of the Society Conference of IEICE   409 - 409   2007

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  • B-5-110 Compensation for Intersymbol Interference Caused by Fast Fading for an FFT Equalizer

    FUJIMURA Yuki, DENNO Satoshi

    Proceedings of the IEICE General Conference   524 - 524   2007

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  • B-8-4 Time-Frequency Analysis for Indoor Power Line Channel Synchronized with Power Frequency

    Hayasaki Taro, Umehara Daisuke, Honda Shinya, Denno Satoshi

    Proceedings of the IEICE General Conference   320 - 320   2007

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  • Convolutional Coded Quasi-Orthogonal STBC and its decoding

    FUJITA Takashi, DENNO Satoshi, MORIHIRO Yoshiteru

    IEICE technical report   106 ( 360 )   101 - 106   2006.11

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    Orthogonal STBC causes a problem, transmission rate decreasing with the multiplication of antennas. Using Quasi-Orthogonal STBC, while decoding is complicated, we can solve this problem. Moreover, allocating the redundancy of FEC to the rate difference between Orthogonal STBC and Quasi-Orthogonal STBC in order to achieve higher quality communication of the same rate with Orthogonal STBC. This paper proposes a scheme to decode Quasi-Orthogonal STBC and convolutional codes at the same time, and estimate its scheme in the aspect of BER.

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  • Performance Analysis of Least Bit Error Rate Algorithm (LBER) for Adaptive Array Antennas

    SAKAGUCHI Shogo, DENNO Satoshi, MORIHIRO Yoshiteru

    IEICE technical report   106 ( 302 )   47 - 52   2006.10

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    To suppress cochannel interference and receive desired transmitted signals properly, adaptive array antennas is so useful technique. Recently, control algorithms of adaptive array antennas that suppress interference waves more than receive antennas have been studied. In those algorithms, it has been showm that LBER (least bit error rate) has better bit error rate property than LMS (least mean square). In this paper, I apply LBER to control adaptive array antennas and verify the property in cochannel interference environment and analyze the operation.

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  • B-5-72 A study on adaptive image-band interference cancellation in fast fading channels

    Hayashi Daisuke, Denno Satoshi, Furuno Tatsuo, Morihiro Yoshiteru

    Proceedings of the Society Conference of IEICE   2006 ( 1 )   432 - 432   2006.9

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  • B-4-72 Measurement and Analysis of Shortwave Power Line Impulsive Noise

    Umehara Daisuke, Denno Satoshi, Morihiro Yoshiteru

    Proceedings of the Society Conference of IEICE   2006 ( 1 )   348 - 348   2006.9

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  • A-5-2 Performance Evaluation of CSK Modulation Using PR-QMF Codes

    UEYAMA Daisuke, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the Society Conference of IEICE   2006   104 - 104   2006.9

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  • B-1-190 Performance Analysis of Least Bit Error Rate Algorithm (LBER) for Adaptive Array Antennas

    SAKAGUCHI Shogo, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the Society Conference of IEICE   2006 ( 1 )   190 - 190   2006.9

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  • A Fast Synchronization Scheme for Adaptive Image-band Interference Cancellation in Heterodyne Multimode Receivers

    HAYASHI Daisuke, DENNO Satoshi, MATOBA Naoto, MORIHIRO Yoshiteru

    IEICE technical report   106 ( 25 )   1 - 6   2006.4

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    When we realize multimode receivers, we need to remove BPF (Band-Pass Filter) of RF (Radio Frequency), but if we construct multimode receivers using heterodyne reception, the imageband interference arises and deteriorates transmission characteristics significantly. Then, cancellation methods have been heretofore proposed, they have problems that convergence properties are not good. Therefore, I propose a cancellation method which makes converge faster in this report. In this method, we use frequency converters to receive desired signals and imageband signals, and add both outputs with weighting. I picked out CDMA (Code Division Multiple Access) as a transmission system. In the case, I propose a method to treat imageband interference cancellation and rake reception at a time. I describe that the proposed method has a superior property on 2 paths Rayleigh fading channels.

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  • B-5-80 Quasi-Orthogonal Space-Time Block Codes for Multiple Antennas

    Yamamoto Tomonori, Denno Satoshi, Morihiro Yoshiteru

    Proceedings of the IEICE General Conference   2006 ( 1 )   433 - 433   2006.3

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  • B-5-114 Interative Equalization of an FFT-Equalizer in Fast Fading Channels

    FUJIMURA Yuki, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the IEICE General Conference   2006 ( 1 )   467 - 467   2006.3

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  • Interative Equalization of an FFT-Equalizer in Fast Fading Channels

    FUJIMURA Yuki, DENNO Satoshi, MORIHIRO Yoshiteru

    IEICE technical report   105 ( 623 )   43 - 48   2006.3

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    Frequency domain equalization for single carrier transmission systems has drawn much interest because it achieves superior performance even in severe multipath fading channels with the assist of cyclic prefix (CP), which is attached at the top and tail of an FFT (Fast Fourier Transform) frame. However, the frequency domain equalizer can not keep the performance unless channel impulse response is regarded constant during the FFT frame. In other words, performance of the equalizer degrades due to fast fading channels. This means the additional noise at the output of the equalizer is generated by fast fading, equivalently. Therefore, MMSE (Minimum Mean Square Error) channel estimation is desired to take the noise into account in order to resist the performance degradation. This paper proposes an MMSE channel estimation scheme based on an iterative noise estimation scheme which is able to estimate the additional noise and the additive Gaussian noise.

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  • Improvement of Code Acquisition Performance in Heterodyne Multimode Receivers

    FURUKAWA Tomoya, DENNO Satoshi, MATOBA Naoto, MORIHIRO Yoshiteru

    IEICE technical report   105 ( 560 )   95 - 100   2006.1

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    It is desired that multimode receivers which communicate with several wireless communication systems are composed by a single wireless platform. Conventionally, multimode receivers that don't need the RF (Radio Frequency) filter in the RF front end of the wireless machine and implement the property of imege-band interference cancel are proposed. In this report, we propose a code synchronization method when we apply these multimode receivers to SS (Spread Spectrum) system which used in the third-generation mobile communication system. We propose two kinds of code synchronization methods, and compare overall characteristic of these and image-band interference cancel method by the simulation. multimode receivers

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  • A-21-16 Adaptive beam forming with sensor collaboration for sensor network systems

    Tokukura Motoyuki, Denno Satoshi, Tomisato Shigeru, Hata Masaharu, Morihiro Yoshiteru

    Proceedings of the Society Conference of IEICE   228   228 - 228   2006

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  • B-5-81 Performance of FFT-Equalization in Fast Fading Channels

    FUJIMURA Yuki, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the Society Conference of IEICE   2005 ( 1 )   481 - 481   2005.9

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  • B-5-124 Timing Offset Estimation for Code Synchronization in Heterodyne Multimode Receivers

    FURUKAWA Tomoya, DENNO Satoshi, MATOBA Naoto, MORIHIRO Yoshiteru

    Proceedings of the Society Conference of IEICE   2005 ( 1 )   524 - 524   2005.9

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  • Performance Analysis of Algorithms for Adaptive Array Antennas in Cochannel Interference Environment

    SAKAGUCHI Shogo, DENNO Satoshi, MORIHIRO Yoshiteru

    IEICE technical report. Antennas and propagation   105 ( 126 )   13 - 18   2005.6

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    To suppress cochannel interference and receive desired transmitted signals properly, adaptive array antennas is so useful technique. In control algorithms of adaptive array antennas, algorithms that minimize its cost function mean square error have been studied and it has been shown that these algorithms can suppress interference waves less than receive antennas. But recent study suggested more appropriate algorithms that minimize its cost function BER (bit error rate). These algorithms are mainly suggested for binary phase shift keying. In this paper, I propose AMBER and LBER for quadreture phase shift keying and verify the effectiveness of the proposed algorithms in cochannel interference environment through computer simulations.

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  • Joint Signal Processing of Image-band Interference Cancel and Code Acquisition in Multimode Receivers

    FURUKAWA Tomoya, DENNO Satoshi, MORIHIRO Yoshiteru

    Technical report of IEICE. RCS   105 ( 88 )   47 - 52   2005.5

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    Multimode receivers which can receive signals of many systems get the attention, because it enables to reduce the size of terminal. In this paper, we propose a constitution method of multimode receiver which uses heterodyne system. We employe SS (Spread Spectrum) system which used in the third-generation mobile communication system. In general, the miniaturization of RF (Radio Frequency) architecture is important issue because multimode receiver needs system specific RF architecture. When we deploy RF band BPF (Band Pass Filter) in the receiver, we cannot receive all RF signal. Because of this, we propose a new architecture which implement blind signal processing of image-band interference cancel and code acquisition without RF band BPF. This architecture is confirmed in the presence of CIR (Carrier to Interference Ratio)=-40dB.

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  • A-5-27 An Optimal Decoding for LDPC Codes over Impulsive Noise Channels

    NAKAGAWA Hiroki, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the IEICE General Conference   2005   143 - 143   2005.3

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  • B-5-245 Channel Allocation Algorithms for Mesh-Type FWA System Using Real-world LOS Data

    IZUMI Keita, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru, UCHIDA Daisei

    Proceedings of the IEICE General Conference   2005 ( 1 )   694 - 694   2005.3

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  • B-5-99 Multibeam Interference Cancellation for Space Time Block Code

    Denno Satoshi, Morihiro Yoshiteru

    Proceedings of the IEICE General Conference   2005 ( 1 )   548 - 548   2005.3

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  • A-5-29 An SS-CSK Modulation Using Extended M-Sequence for Power Line Communications

    MASHINO Jun, UMEHARA Daisuke, DENNO Satoshi, MORIHIRO Yoshiteru

    Proceedings of the IEICE General Conference   2005   145 - 145   2005.3

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  • Delayed Decision Feedback Sequence Estimation for Multibeam Interference Cancellation

    Denno Satoshi

    Proceedings of the Society Conference of IEICE   2001 ( 1 )   443 - 443   2001.8

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  • Maximum Likelihood Sequence Estimation for Multibeam Interference Cancellation

    DENNO Satoshi

    Technical report of IEICE. RCS   101 ( 91 )   9 - 15   2001.5

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    This paper proposes a maximum likelihood sequence cstimatkm (MLSE) in multibeam interference cancellation over CCI (Co-channel interference) channels. A likelihood function which is essential in MLSE is derived in multichannel systems which consist of radio propagation channels and space time multibeam arrays although a certain requirement is needed through the derivation. To estimate the maximum likelihood sequence in any conditions such as mobile communication channels, the beam forming criterion which satisfies the requirement is described. In addition, it is shown that the noise variance existing in the likelihood function can be estimated. The performance of the proposed scheme, a multibeam interference with MLSE, is verified by computer simulation that has superior BER performance to the single beam space time adaptive array and better performance by 2〜3 dB than the multibeam interference canceller with hard decision over CCI channels in mobile communication systems.

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  • Robust Image frequency Interference Canceller in Multimode Receivers

    Denno Satoshi

    Proceedings of the IEICE General Conference   2001 ( 1 )   516 - 516   2001.3

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  • Verification of an Array Signal Processing Unit with Algorithm Diversity for Software Antennas

    FURUHI Tomoshige, DENNO Satoshi, OHIRA Takashi

    Proceedings of the IEICE General Conference   2001 ( 1 )   99 - 99   2001.3

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  • Multibeam Interference Cancellation based on Multibeam Order Extended Fast Algorithm

    DENNO Satoshi

    Technical report of IEICE. RCS   100 ( 561 )   37 - 44   2001.1

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    This paper proposes a novel multibeam interference canceller which can achieve high transmission performance in multiuser environments over mobile communication channels. In addition to this, multibeam order extended fast algorithm for the multibeam interference canceller is proposed that can be implemented with less computational complexity than RLS (Recursive Least Squares) algorithm. In spite of the little computational complexity, the proposed algorithm attains rapid initial acquisition same to RLS algorithm. Although the multibeam interference canceller has several kind of tap vectors which define the directivity patterns of the multibeam, the multibeam interference canceller based on the multibeam order extended fast algorithm can estimate these tap vectors through only one Kalman gain vectors update. This is why the multibeam interference canceller based on the multibeam order extended fast algorithm can be implemented with little computational complexity. The the multibeam interference canceller based on the multibeam order extended fast algorithm achieves the rapid convergence same to theoretical upper bound and has superior performance by 6dB to the conventional decision feedback adaptive array.

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  • Multibeam Interference Canceller Based on Order Extended Fast Algorithms

    Denno Satoshi

    Proceedings of the Society Conference of IEICE   2000 ( 1 )   292 - 292   2000.9

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  • An MLSE Equalizer LSI Performance on 100Mbit/s Transmission

    SHIRATO Yushi, KOBAYASHI Kiyoshi, DENNO Satoshi

    Proceedings of the IEICE General Conference   2000 ( 1 )   539 - 539   2000.3

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  • A Trial Production of Array Signal Processing Unit with Algorithm Diversity for Software Antenna

    FURUHI Tomoshige, DENNO Satoshi, MIZUGUCHI Yoshihiko

    Proceedings of the IEICE General Conference   2000 ( 1 )   170 - 170   2000.3

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  • A CMA Adaptive Array for CDMA Which Despreads Spread Spectrum Signals

    Kamiya Yukihio, Denno Satoshi, Mizuguchi Yoshihiko, Katayama Masaaki, Ogawa Akira

    Technical report of IEICE. SST   99 ( 628 )   133 - 138   2000.2

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    The application of adaptive arrays is widely paid attention. Although its application to CDMA systems has been considered intensively, spatial signal processing achieved by an adaptive array and dispreading of received signals were accomplished separately. The authors proposed an adaptive array which achieves two different types of signal processing, mentioned above, simultaneously based on CMA. However, it can not work in multi-user system, even though the proposed scheme achieves full-blind signal processing, . In this paper, we propose to employ the proposed scheme in CDMA multi-user system by setting a spreading code as an initial weight of CMA. The performance under fading environment is examined through computer simulations.

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  • Development of an adaptive array based on subband signal processing

    Kamiya Yukihiro, Denno Satoshi, Mizuguchi Yoshihiko, Katayama Masaaki, Ogawa Akira, Karasawa Yoshio

    Technical report of IEICE. SST   99 ( 628 )   125 - 132   2000.2

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    Adaptive arrays are recognized as a solutin to overcome multipath fading environments that can be serious problem in high-speed mobile communication systems. Particularly, adaptive arrays based on subband signal processing achieve efficient signal processing due to its parallel configuration. In this paper, an adaptive array based on subband signal processing is implemented by using DSPs and its performance is verified through experiments in an anechoic chamber. Finally, computational loads of adaptive arrays are examined and it is shown that the implemented adaptive array realizes very efficient signal processing.

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  • マルチシステム受信機におけるイメージ周波数信号干渉の補償法

    田野哲

    信学技報   67 - 73   2000

  • M-CMA(Modified Constant Modulus Algorithm) Adatpive Array with Equalization Based on Digital Signal Processing

    DENNO Satoshi, OHIRA Takashi

    Technical report of IEICE. RCS   99 ( 356 )   97 - 103   1999.10

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    Adaptive arrays have been proposed in which microwave analog beamforming and adaptive control are combined, in order to reduce both a complexity and a cost of an adaptive array. Besides, adaptive arrays based on spatial and temporal signal processing is known to be effective in high speed mobile communication systems such as mobile multimedia communication systems, since transmitted signals has to suffer from severe multipath fading. Therefore, this paper describes how to extend the adaptive arrays with microwave bcamforming to those based on spatial and temporal signal processing. In addition, it is proposed to apply M-CMA to adaptive arrays with microwave beamforming based on spatial and temporal signal processing.

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  • A Novel CMA Adaptive Array Applicable to DS-SS Systems

    KAMIYA Yukihiro, DENNO Satoshi, MIZUGUCHI Yoshihiko, KATAYAMA Masaaki, OGAWA Akira, KARASAWA Yoshio

    IEICE technical report. Antennas and propagation   99 ( 267 )   13 - 18   1999.8

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    Adaptive arrays have been paid attention widely as an attractive solution for multipath fading in the mobile communication systems. Although many configurations of the adaptive array and adaptive control shiemes are proposed, its complexity prevents it from practical use. In this paper, we propose novel configuration of the adaptive array which acheives beamforming, equalization and despreading simultaneously based on CMA algorithm applicable to one-user Spread Spectrum communication systems. It is expected that it allows us to implement easily due to its simple configuration. The performance is examined through computer simulations.

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  • M-CMA (Modified Constant Modulus) algorithm : A Novel Algorithm for Adaptive Beamforming based on Microwave Signal Processing

    DENNO Satoshi, OHIRA Takashi

    Proceedings of the Society Conference of IEICE   1999 ( 1 )   401 - 402   1999.8

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  • Adaptive Antenna with Digital Decision Feedback to Microwave Stage Beamforming

    OHIRA Takashi, GYODA Koichi, DENNO Satoshi

    Proceedings of the Society Conference of IEICE   1999 ( 1 )   407 - 408   1999.8

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  • Modified Constant Modulus Algorithm : A Novel Algorithm for Adaptive Beamforming Based on Microwave Signal Processing

    DENNO Satoshi, OHIRA Takashi

    IEICE technical report. Antennas and propagation   99 ( 211 )   15 - 22   1999.7

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    An adaptive array antenna based on combination of digital signal processing and micro-wave signal processing has been proposed, which makes both price and hardware scale of an adaptive array antenna system lower. This paper proposes novel algorithms such as "M-Power algorithm"and "M-CMA", which are suitable for the adaptive array antenna. These algorithm can control the antenna directivity pattern of the array-antena without monitoring the received signals fed from antenna elements. Moreover, M-CMA can also control the null of its directivity pattern. The beampatterns of the adaptive array antenna based on the two algorithm are verified in the equivalent low pass systems by computer simulations. Furthermore, the adaptive array antennas based on the adaptive algorithms are examined to have superior performance.

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  • Microwave Signal Processing Adaptive Beamforming and Electronically Steerable Passive Array Radiator Antenna

    OHIRA Takashi, GYODA Koichi, DENNO Satoshi

    IEICE technical report. Antennas and propagation   99 ( 211 )   9 - 14   1999.7

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    An adaptive array concept with microwave signal processing is presented. The array weighting and signal combining are carried out on the microwave stage, while the decision and weight control are executed by DSP. Unlike conventional DBFs, it does not necessitate numbers of frequency converters and analog-to-digital converters but only one of each. The signal combining before A/D conversion offers 21 significantly wider dynamic range than DBFs. Also proposed hereby is a novel electronically steerable passive array radiator antenna or ESPAR antenna. Thanks to the varactor-loaded passive radiators, it offers full 360-degree beam steering, complete elimination of phase shifters, and single-port feeding.

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  • B-5-46 Stabilization of Order Extended QNFTF (Quasi-Normalized Fast Transversal Filter) Algorithm

    DENNO Satoshi

    Proceedings of the IEICE General Conference   1999 ( 1 )   397 - 397   1999.3

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  • Software Antenna [II] : How to identify the radio-environment, and then

    KARASAWA Yoshio, INOUE Takashi, KAMIYA Yukihiro, DENNO Satoshi

    Technical report of IEICE. RCS   98 ( 435 )   7 - 12   1998.11

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    We have proposed a new concept of kaleidoscopic antenna, we call it "software antenna, " which pursues a realization of required performance under minimum software/hardware resources. The software antenna instantly reconfigures itself adapting its software and hardware to changes in the time-varying radio-environment. In this paper, we describe how to categorize the radio-environment which is one of the most important functions of the antenna. Relation between categorized envrionments and adaptive signal processing algorithms is discussed.

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  • Decision feedback adaptive arrays based on an order-extended Quasi-normalized FTF algorithm

    DENNO Satoshi

    Proceedings of the Society Conference of IEICE   1998 ( 1 )   322 - 322   1998.9

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  • Development of 3tap Adaptive MLSE Equalizer LSI

    SHIRATO Yushi, KOBAYASHI Kiyoshi, DENNO Satoshi

    Proceedings of the Society Conference of IEICE   1998 ( 1 )   278 - 278   1998.9

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  • Configuration and Performance of Adaptive Arrays based on an Order Extended Fast Algorithm

    DENNO Satoshi

    Technical report of IEICE. RCS   98 ( 159 )   31 - 38   1998.6

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    A novel adaptive algorithm, "Order extended fast algorithm", is proposed that is suitable for adaptive arrays with decision feedback equalization which is indispensable for high speed mobile communication systems. The proposed algorithm has fast acquisition performance, since this algorithm gives a solution of least square estimation recursively as well as RLS(Recursive Least Squares) algorithm, basically. In spite of this, the proposed algorithm requires much less operational complexity than RLS algorithm because of its feature of updating a gainvector in contrast with updating a correlation matrix in RLS. As tap length of the adaptive array becomes larger, operational complexity reduction efficiency becomes higher. Finally, it is verified that the proposed algorithm can achieve fast convergence and have superior BER performance by computer simulations.

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  • Decision feedback adaptive array equalizer based on an order extended first transversal filter algorithm

    DENNO Satoshi

    Proceedings of the IEICE General Conference   1998 ( 1 )   543 - 543   1998.3

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  • Correlation Matrix Decomposition Algorithm for Adaptive Arrays with Decision Feedback Equalization

    DENNO Satoshi

    Technical report of IEICE. DSP   97 ( 582 )   81 - 86   1998.3

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    A novel adaptive algorithm, "Correlation matrix Decomposition algorithm", is proposed that is suitable for adaptive arrays with decision feedback equalization.This algorithm has following characteristics, (1)to achieve first acquisition performance, (2)to have lower operational complexity than RLS(Recursive Least Square)algorithm.This algorithm is derived by decomposing an autocorrelation matrix of input signals and neglecting its crosscorrelation parts produced by signals fed from different antenna elements, when the normal equation is recursively solved.Performance of the algorithm is theoretically analyzed and tested by computer simulation to have good performance.

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  • Cofiguration and Performance of a divesity combining DFE for Mobile Communication at a User Rate of 512 kbit/s Transmission

    SHIRATO Yushi, DENNO Satoshi, SAITO Yoichi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   81 ( 3 )   248 - 250   1998.2

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  • High Speed QVLMS (Quantized Variable-gain Least Mean Squares)-MLSE(Maximim Likelihood Sequence Estimation) Equalizer for Mobile Communications -

    DENNO Satoshi, SAITO Yoichi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   81 ( 1 )   10 - 18   1998.1

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  • A Highspeed MLSE Equalizer LSI for Mobile Communication

    SHIRATO Yushi, DENNO Satoshi, KOBAYASHI Kiyoshi, OGOSE Shigeaki

    Technical report of IEICE. RCS   97 ( 266 )   21 - 26   1997.9

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    A Highspeed MLSE(Maximum Likelihood Sequence Estimation) Equalizer LSI has been developed. The LSI offsets a degradation caused by delayed signal, in case the difference of the arrival time is within 1 symbol duration. It realizes 2 branch combining diversity reception. The LSI consists of 70k gates, and operates at the power supply voltage of 3.3V. Performance test under 2 ray Rayleigh fading condition using a 6.144Mbit/s-QPSK Modem shows that the LSI limits the floor of the Bit Error Rate lower than 10^<-5> and 10^<-6>, with and without diversity reception respectively. The performance test using 54.912Mbit/s-QPSK Modem shows the usefulness of the LSI at the higher speed communication. Power consumption of the chip, which is proportional to bit rate, is 170mW at the bit rate of 10Mbit/s.

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  • Performance of Anti-Multipath Techniques in Micro-Cellular Systems

    DENNO Satoshi, HATTORI Takeshi

    IEICE technical report. Antennas and propagation   97 ( 228 )   35 - 40   1997.8

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    The performances of anti-multipath techniques such as a multibranch selection diversity, an adaptive array antenna and transversal combining decision Feedback equalizer(TC-DFE) are analyzed by computer simulation. The way to approximate the bit error rate functions of both the adaptive array antenna and the TC-DFE each of which has superior performance over delay dispersive channels are explained. According to a empirical equations of propagation parameters estimation and the above function, the equalization is more significant than array antennas in mobile communication systems with higher than 6Mbit/s.

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  • A Quadrature and Gain Error Compensation Circuit for a PSK Demodulator

    YAMADA Tomoyuki, SHIRATO Yushi, DENNO Satoshi

    Proceedings of the Society Conference of IEICE   1997 ( 1 )   414 - 414   1997.8

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  • Design and Performance of 32 kbit/s π/4-QPSK VLMS (Variable-gain Least Mean Squares) MLSE Equalizer

    DENNO Satoshi, SAITO Yoichi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   80 ( 6 )   pp.483 - 491   1997.6

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  • Performance of a 6Mbit/s Burst MODEM using an Adaptive Equalizer

    DENNO Satoshi

    Proceedings of the IEICE General Conference   1997 ( 1 )   741 - 742   1997.3

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  • A study on improving methods for the combining diversity DFE with mode switching

    SHIRATO Yushi, DENNO Satoshi, SAITO Yoichi

    Proceedings of the IEICE General Conference   1997 ( 1 )   497 - 497   1997.3

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  • Array combining DFE based on a order extended Fast-Kalman algorithm

    DENNO Satoshi

    Proceedings of the Society Conference of IEICE   310 - 310   1997

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  • Design and Performance of 1.5Mbit/s VLMS(Variable-gain Least Mean Squares) - MLSE(Maximum Likelihood Sequence Estimation) Eqaulizer using FPGAs(Field Programable Gate Arrays)

    DENNO Satoshi, SAITO Yoichi

    IEICE technical report. Antennas and propagation   96 ( 304 )   73 - 78   1996.10

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    In high speed digital mobile communication systems, techniques to combat ISI (inter-symbol-intereference) caused by the delay spread in fading channels are required to improve BER performance. We propose complexty reduction methods for an adaptive MLSE equalizer which is a strong candidate to limit the degradation from the ISI. The equalizer based on the proposed methods is developed using FPGAs (field Programmable Gate Arrays) and verified to be fabricated with about 40kgate transistors. The equalizer is experimentally evaluated to suppress BER floor below 10^<-5> and achieve 10dB implicit diversity gain in a multipath fading channel with delay spread equal to 650nsec and synchronize in 8 symbols.

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  • Configuration and Performance of a Decision Feedback Equalizer based on a Dimension extended Fast-Kalman Algorithm

    DENNO Satoshi, SHIRATO Yushi, SAITO Yoichi

    Proceedings of the Society Conference of IEICE   1996 ( 1 )   422 - 422   1996.9

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  • Performance of Adaptive Equalizer for High Speed Mobile Communication

    SHITRATO Yushi, DENNO Satoshi, SAITO Yoichi

    IEICE technical report. Communication systems   96 ( 49 )   1 - 6   1996.5

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    An adaptive equalizer, which has multi-DSP structure and can operate at the information rate of 512kbit/s, is developed. With this equalizer, experimental investigation is taken place under the condition of bit rate of 1.536Mbit/s to show the performance of adaptive equalizer whose calculation size is reduced. The experimental system has 2branch diversity receiver structure. In this report, two kinds of equalizer algorithm are investigated on the calculation size and its performance. As to the calculation size, both of them are a forth to a fifth as large as that of reference. With these algorithms, the degradation of CNR from reference is less than 1.5dB at the point of BER=10^<-4>, under 2ray or 6ray Rayleigh fading channel model whose Doppler frequency of 10Hz and delay spread of 500ns.

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  • Performance of Oversampling AGC

    SHIRATO Yushi, DENNO Satoshi, SAITO Yoichi

    Proceedings of the Society Conference of IEICE   1995 ( 1 )   195 - 195   1995.9

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  • Performance of 32kbit/s Real Time VLMS-Mlse Equalizer

    DENNO Satoshi, SAITO Yoichi

    Proceedings of the Society Conference of IEICE   1995 ( 1 )   275 - 275   1995.9

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  • Fast Channel Impulse Response Estimation Scheme for Adaptive MLSE (Maximum Likelihood Sequence Estimation) Equalizer-Proposal of VLMS(Variable-gain Least Mean Squares) Algorithm-

    DENNO Satoshi, SAITO Yoichi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   78 ( 4 )   221 - 230   1995.4

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  • An Automatic Frequency Control for the VLMS-MLSE Equalizer

    DENNO Satoshi

    Proceedings of the IEICE General Conference   464 - 464   1995

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  • Chracteristics of Transmitter Diversity Combined with Pre-equalization Technique

    Shirato Yushi, Denno Satoshi, Saito Yoichi

    1994 ( 1 )   356 - 356   1994.9

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  • Diagonalized VLMS-MLSE with the use of Orthogonal Transformation

    Denno Satoshi, Saito Yoichi

    1994 ( 1 )   361 - 361   1994.9

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Awards

  • Contribution to Academic Research

    2022.11   The WPMC 2022 Steering Committee  

    Satoshi Denno, Takuma Fujii, Yafei Hou

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  • 功労顕彰状

    2021.9   電子情報通信学会  

    田野 哲

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  • 教育功労賞

    2021.3   電子情報通信学会  

    田野 哲

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  • Outstanding Paper Award

    2021.2   The 23rd International Conference on Advanced Communications Technology   Busy/Idle Duration Prediction for Video and Audio WLAN Traffics Using Autoregressive Predictor with Data Categorization

    Yafei Hou, Shun Kawasaki and Satoshi Denno

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  • 活動功労賞

    2020.9   電子情報通信学会通信ソサィエティ  

    田野 哲

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  • Best paper award

    2020.5   IEICE Communication Society   A Novel Low Complexity Lattice Reduction-Aided Iterative Receiver for Overloaded MIMO

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, and Yafei Hou

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Research Projects

  • Terminal collaboration technology that both improves energy efficiency and communication performance

    Grant number:23H00474  2023.04 - 2027.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    村田 英一, 岡本 英二, 井田 悠太, 丸田 一輝, 岡田 啓, 實松 豊, 西村 寿彦, 牟田 修, 田野 哲, 眞田 幸俊

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    Grant amount:\48360000 ( Direct expense: \37200000 、 Indirect expense:\11160000 )

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  • 無線マルチホップネットワークにおける過負荷通信の研究

    Grant number:21K04061  2021.04 - 2024.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    田野 哲, 上原 一浩, 冨里 繁, 侯 亜飛

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    第五世代セルラーや無線LANのIEEE 802.11ax 等の研究開発動向からも分かるように、無線ネットワークの高速化・大容量化が止まることを知らない。また、夥しい数のIoTデバイスとインターネットを繋ぐ無線ネットワークの同時接続数は、本格的なIoT時代であろう次世代には、一桁以上増大させる必要がある。高速化を達成するため、広い連続帯域の割り当てが可能な高周波数帯が次世代の無線通信に割り当てられると想定される。高周波数帯の無線信号は伝送路で大きく減衰する。この問題を緩和する、無線マルチホップネットワークが盛んに検討されている。加えて、IoT社会の実現のため、センサー端末が様々な場所、例えば人が足を踏み入れない場所にも配置される。そのような場所との通信を実現するためにも、無線マルチホップネットワークの適用が検討されている。但し、従来の無線マルチホップネットワークを適用した場合には、ホップ数の増大と共に通信速度が低下する問題がある。この問題を克服するため、送信端末や中継端末に複数アンテナを配置して空間多重を適用することが検討されている。但し、空間多重を適用しても、中継端末や送信端末のアンテナ数が少ないことがボトルネックとなり、通信の速度向上を阻むという問題がある。また、無線ネットワークでは晒され端末・中継端末が容易に生まれ、無線マルチホップネットワーク全体の通信速度を制限するという問題がある。
    本研究は無線マルチホップネットワークにおける上記のボトルネックの解消、あるいは緩和が原理的に可能かどうかという学術的な問いに端を発している。複雑な無線マ ルチホップネットワークにおける「中継機のアンテナ数不足」
    や「さらされ中継局」による通信速度低下問題を研究し、この問題の緩和・解消法を探る。 同時に、緩和・解消法を導入したときの通信速度・通信容量の理論を検討する。

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  • 2D/3D indoor localization using multiple leaky coaxial cables over irregular wireless coverage environment.

    Grant number:20K04484  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    侯 亜飛, 上原 一浩, 冨里 繁, 田野 哲

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    (1) In this year, using the LCX channel model, we built an indoor scenario and generated RSSI data. Based on the data correlation analysis and prediction theory, the lower bound and upper bound of predictability of generated LCX RSSI data have been researched. Then the RSSI value ahead has been predicted using a probabilistic neural network (PNN). The similar research on indoor localization has also been realized with more accurate localization level using PNN.
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    (2) A new research direction of localization of multiple users over wireless coverage using LCX has been proposed, which evaluated the TOA estimation of multiple users in a simultaneous way. Furthermore, we also investigated the capacity improvement of LCX system using spatial modulation with the main idea of on/off the LCX slots.

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  • IoTの本格普及に向けた、衝突した端末信号の分離・復調技術の開発

    Grant number:20K04465  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    上原 一浩, 冨里 繁, 田野 哲

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    身の回りの殆どのデバイスに無線機能が搭載され、5Gも実用化されつつあり、IoTの本格普及が間近である。しかし数百億個のIoT端末が世界中に偏在し、限られた周波数資源の中でセンサ端末等の低機能の無線端末が無秩序に通信し、衝突や干渉により従来の受信機ではデータが受信出来なくなり、時に人々の安心安全をも脅かすという課題がある。本研究では、広帯域受信スペクトルを一旦クラウドに蓄積し、過去・現在・未来のデータを用いて一括信号処理することにより、従来の受信機では実現できない、衝突した信号や干渉を受けたIoT/M2M端末信号の分離・復調技術の確立を目指す。抜本的な周波数有効利用実現の可能性を秘めた本技術の確立により、今後のIoTの本格普及に対応可能な次世代の無線通信インフラの実現に貢献していく。本年度は、提案した特徴量復調方式について検討を進め、様々な条件における信号分離・復調性能と適用領域を明らかにし、研究目的の達成を目指した。
    基本的な変調方式(BPSK、QPSK、8PSK、16QAM、64QAM)について、また1シンボル内に連続して位相が変化する変調方式としてGMSKについて、更に1シンボル内に位相遷移が加えられる変調方式としてπ/4シフトQPSKについて、短時間フーリエ変換(STFT)の窓関数を変えた場合の性能評価を行い、矩形、ハニング、ハミング、ブラックマンについて各特性を明らかにしてきたが、更にDU比、干渉波の数、窓ずらし幅等の様々な条件を変えた場合の性能評価を行い、同期検波方式及び提案した特徴量復調方式による信号の分離・復調性能を定量的に明らかにした。加えて、マルチキャリア信号伝送方式であるOFDMに対する信号分離・復調性能の評価にも着手した。更に所望波と干渉波の変調方式が異なる場合の信号分離・復調性能を明らかにし論文にまとめ、採録された。

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  • A study of broadband LED visible light communication systems for IoT

    Grant number:18K04143  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Tomisato Shigeru

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    This research proposed a collaborative linearization method in both transmitter and receiver to compensate this non-linear distortion which employs digital pre-distortion processing for LED non-linear distortion in a transmitter and iterative cancellation processing for residual distortion noise by the pre-distortion in a receiver, and clarified the effectiveness.
    The research also proposed a compensation method which employs amplitude deviation compensation of frequency response in a transmitter and an iterative canceller to compensate non-linear distortion caused by the amplitude deviation compensation in a receiver, and clarified the effectiveness.
    Furthermore, the research proposed spatially parallel signal transmission with a lot of LED lighting and photodetectors, and clarified that the proposed method can accelerate the bit rate of visible light communications.

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  • Research on XOR-physical layer network coding with non-linear precoding

    Grant number:18K04142  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Denno Satoshi

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    We have proposed a novel non-linear precoding with gain equalization functionality for alleviating high computational complexity caused by an application of multilevel modulations. The proposed non-linear precoding reduces computational complexity of the relays to one several hundreds of the original complexity. A new coded modulation for multilevel modulations has been proposed to improve the transmission performance. The proposed coded modulation achieves a gain of about 2dB at the BER of 1.0E-4, when the 16QAM or the 256QAM is applied. A new relay terminal selection has been proposed for maximizing the transmission performance in the channel where lots of relay terminals are scattered around the terminals. The proposed terminal selection achieves a gain of 13dB at the BER of 1.0E-3.

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  • Development of terminal signal contention-free cloud receiver technology in the IoT era

    Grant number:17K06425  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Uehara Kazuhiro

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    The signal separation algorithm extracts the power component and the phase component on the center frequency of the desired signal by the short-time Fourier transform (STFT) as a feature value from the time-continuous frequency characteristics of the overlapping received signals. The desired signal is restored by multiplying this feature value by the power component and phase component of the reference signal. The performance of this algorithm was evaluated for various modulation schemes by calculation and experiments and its effectiveness was shown. In addition, we have newly proposed a feature value demodulation method that can improve the separation / demodulation performance. It has been shown that when the number of multi-values becomes large, a remarkable effect appears, and for example, it becomes possible to separate and demodulate 16QAM signals which could not be separated by the conventional technology.

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  • A Study on overloaded MIMO wireless systems with virtual channels based on generalized rotation matrices

    Grant number:15K06066  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    DENNO SATOSHI, KITAMOTO Akihiro, Cao Lengchi, SAWADA Ryosuke, NAGAI Yuto

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    High speed wireless communication is achieved by increasing the number of transmit signal streams transmitted simultaneously. Actually, it is almost impossible to get the number of the streams more than that of the receive antennas due to prohibitive computational road of the receiver. This research project proposed generalized rotation matrices that make the complexity of the receiver flexible. In fact, the complexity can be reduced to about 1/100 of that of the original receiver by the proposed technique. The proposed technique allows the number of the simultaneously transmit signals to be three times or four times as many as that with conventional receivers. We considered iterative detection combined with the proposed technique to improve the transmission performance. We have proposed a technique to reduce the computational complexity in MIMO physical layer network coding where the number of received signals at the relay is more than that of the receive antennas.

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  • Sensor network systems with 100%-coverage by using sensor collaborative beam forming

    Grant number:25420370  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Tomisato Shigeru, DENNO SATOSHI

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    This research studies adaptive transmission and frequency offset estimation for sensor collaborative beam forming. In addition, power consumption reduction effect with the beam forming is evaluated by computer simulation.
    A sensor collaborative beam forming method with adaptive transmission is proposed in which collaborative sensor selection and beam forming are performed according to obtained reception quality in a receiving sensor. The simulation result with the proposed method shows that total power consumption of the beam forming with 5 collaborative sensors can be reduced by 60%. The result also shows that offset frequency among transmitting and collaborative sensors can be estimated at practical accuracy even under co-channel interference.

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  • Study on MIMO mobile communication systems with virtual channels

    Grant number:23560453  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    DENNO SATOSHI

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    Grant amount:\5200000 ( Direct expense: \4000000 、 Indirect expense:\1200000 )

    I have proposed a new detector configuration that is able to increase the user throughput in downlinks of wireless communication systems where the number of receive antennas is much less than that of transmit antennas. The proposed detector applies an idea of virtual channels that makes it possible to introduce linear signal processing detectors in the non-linear signal processing detector. Hence, the proposed detector is much less complex than the original non-linear signal processing detector, although the proposed detector achieves the theoretical upper bound in transmission performance. Moreover, I have proposed iterative receiver that consists of the proposed detector and decoder of forward error correction coding. It is confirmed that the proposed iterative receivers achieve more superior transmission performance.

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  • A New Sensor Network System with Collaborative Transmit Beam Forming

    Grant number:22560379  2010 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TOMISATO Shigeru, DENNO Satoshi

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    Sensor collaborative beam forming in which plural transmit sensors collaborate to form a signal beam is proposed to realize highly reliable signal transmission in wireless sensor network systems. The evaluation results confirm that the proposed beam forming method can effectively decrease total power consumption and perform highly-accurate estimation of offset frequency under inter-symbol and co-channel interference conditions.

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  • Study of Wireless Network Coding Schemes

    Grant number:21360185  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MORIKURA Masahiro, DENNNO Satoshi, UMEHARA Daisuke

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    Grant amount:\16640000 ( Direct expense: \12800000 、 Indirect expense:\3840000 )

    This study showed that transmission priority control achieves optimal throughput performances of slotted ALOHA multi-hop wireless communication systems with network coding methods by computer simulations and theoretical analyses. Furthermore, computer simulations and theoretical analyses reveal the effects of thermal noise and radio interferences from other radio systems on the throughput performances of our systems. For home area multi-hop wireless networks, which are composed of the IEEE 802. 11 standard based wireless LANs, the throughput performances and delay performances are improved by the novel control schemes of CWmin and AIFSN. Moreover, these schemes enable the QoS control of VoIP(Voice over IP). Computer simulations show the good performances of the proposed QoS control scheme.

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  • Research on broadband mobile communication techniques in time selective fading channels

    Grant number:20560355  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    DENNO Satoshi, UMEHARA Daisuke

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    Nowadays, block-wise signal processing with FFT (Fast Fourier Transform) is widely used in wireless communication systems. But, block-wise signal processing degrades seriously in fast time varying channels. This research program proposes a novel scheme that mitigates the performance degradation in such channels. It is shown by computer simulation that the proposed scheme achieves superior performance in fast time varying channels with 0.25 of the maximum Doppler frequency normalized by block size, f_DT.

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