Updated on 2022/10/01

写真a

 
TOMISATO Shigeru
 
Organization
Faculty of Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • Doctor(Engineering) ( Osaka University )

Research Interests

  • 移動通信

  • 無線通信

  • LED visible light communication

  • OFDM transmission

  • Mobile communication

  • Radio communication

  • LED可視光通信

  • OFDM伝送

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

Education

  • Osaka University    

    - 1987

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  • Osaka University   工学部   通信工学科

    - 1987

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    Country: Japan

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Research History

  • - Associate Professor,Graduate School of Natural Science and Technology,Okayama University

    2003

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  • - 岡山大学自然科学研究科 准教授

    2003

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Professional Memberships

Committee Memberships

  • IEEE広島支部MAW2020   実行委員  

    2020.10   

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  • IEEE広島支部   理事  

    2019.1 - 2020.12   

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    Committee type:Academic society

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  • 電子情報通信学会和文論文誌B編集委員会   編集委員  

    2015.5 - 2019.5   

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    Committee type:Academic society

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  • 電子情報通信学会ソフトウェア無線研究専門委員会   専門委員  

    2011.5 - 2017.5   

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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専門委員会   専門委員  

    2010.4   

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  • 電子情報通信学会無線通信システム研究専門委員会   専門委員  

    2004.5 - 2010.5   

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  • 電子情報通信学会英文論文誌B編集委員会   編集委員  

    2004.5 - 2010.5   

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  • 電子情報通信学会会誌編集委員会   編集委員  

    2000.5 - 2003.5   

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Papers

  • 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

    2021.12

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  • Evaluation of signal separation / demodulation performance of signals with different modulation systems in storage batch signal processing Reviewed

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

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)   2021.12

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  • SINR Improvement by Adaptive Bandwidth Control in Multi-Band IoT Systems with Spectrum Sharing Reviewed

    Kanta Haino, Shigeru Tomisato, Kazuhiro Uehara

    2021 20th International Symposium on Communications and Information Technologies (ISCIT2021)   2021.10

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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 (ISCIT2021)   2021.10

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  • Coverage Improvement by Adaptive Bandwidth Control Corresponding to Radio Channel Fluctuation in Multi-Band IoT Systems with Spectrum Sharing Systems Reviewed

    Wataru Okada, Shigeru Tomisato, Kazuhiro Uehara

    2021 20th International Symposium on Communications and Information Technologies (ISCIT2021)   2021.10

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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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    Authorship:Corresponding author   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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  • A new scheme of automatic modulation classification using Convolutional Neural Network with constellation diagram Reviewed

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, Kazuhiro Uehara

    IEICE Communications Express   10 ( 8 )   492 - 497   2021.8

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    DOI: 10.1587/comex.2021etl0020

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  • Inter-system interference reduction of adaptive bandwidth control for multi-band wireless transmission Reviewed

    Naoto Takamatsu, Shigeru Tomisato, Kazuhiro Uehara, Satoru Shimizu, Yoshinori Suzuki

    IEICE Communications Express   10 ( 6 )   337 - 342   2021.6

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    DOI: 10.1587/comex.2021xbl0050

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  • A Bandwidth Control Method by Adaptive Multi-Band Selection for Spectrum Sharing Wireless Communication Systems Reviewed

    Naoto Takamatsu, Shigeru Tomisato, Kazuhiro Uehara, Satoru Shimizu, and Yoshinori Suzuki

    2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   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

    2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   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

    2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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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, Syo Nakaie, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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  • A study on automatic modulation classification of digital modulation signals using Convolutional Neural Network Reviewed

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, Kazuhiro Uehara

    2020 International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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  • Adaptive bandwidth control for multi-band OFDM transmission with spectrum sharing Reviewed

    Yoshiki Inuzuka, Shigeru Tomisato, Kazuhiro Uehara, Satoru Shimizu, Yoshinori Suzuki

    IEICE Communications Express   9 ( 5 )   131 - 135   2020

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    DOI: 10.1587/comex.2020xbl0003

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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

    IEEE Global Conference on Consumer Electronics   2019.10

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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

    2019 12TH GLOBAL SYMPOSIUM ON MILLIMETER WAVES (GSMM 2019)   50 - 52   2019.5

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    This paper analyzes optical radio channel propagation characteristics by means of experimental measurement. The channel with an LED and a PD provided by the outstanding technologies co. ltd., is defined as an optical radio channel, and its delay profile is measured by NI-USRPs. As a result, small delayed paths are detected due to the LED or the PD in use. The delay profile is evaluated in a system with single carrier modulation where the frequency domain equalization is applied, in terms of the bit error rate (BER). The transmission performance is about 2dB degraded due to the small delayed paths.

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  • Transmission performance improvement by non-linear distortion noise power control in multi-band systems Reviewed

    Shigeru Tomisato, Jumpei Onji, Kazuhiro Uehara

    Special Issue: Wireless and Mobile Networks and Their Applications, International Journal of Computer and Software Engineering (IJCSE)   4 ( 143 )   2019.3

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

    DOI: 10.15344/2456-4451/2019/143

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  • Prediction of Microcell Propagation Loss in Line of Sight for Sloped Area

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2014   260 - 260   2014

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    DOI: 10.11527/jceeek.2014.0_260

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  • A Study of Correction Method for Urban Path Loss Estimation Formula Applying to Sloping Areas

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2014   257 - 257   2014

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    DOI: 10.11527/jceeek.2014.0_257

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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 (ISAP)   25 - 26   2014

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    This paper shows performance of a transmit beamforming with DOA estimation in fast time selective fading channels with angle of arrival spread. The performance is confirmed by simulation where carrier frequency is assumed to be 20GHz and a linear array antenna is introduced. The unitary ESPRIT is applied for the DOA estimation. The beamfoming gain can be kept high as far as the maximum Doppler frequency f(D) is less than 10(4) in the fading channel.

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  • Study on Microcell Propagation Loss for Slope Terrain Area Using a Scale Model

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2013   308 - 308   2013

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    DOI: 10.11527/jceeek.2013.0_308

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  • A Study of Path Loss Characteristic of Cellular Base Station Looking up at Sloping Area

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2013   307 - 307   2013

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    DOI: 10.11527/jceeek.2013.0_307

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  • An iterative peak power reduction method with adaptive intermediary over-sampling for wireless OFDMA systems Reviewed

    Kazuhiko Fujimoto, Shigeru Tomisato, Masaharu Hata, and Hiromasa Fujii

    電子情報通信学会論文誌EB   E94-B ( 2 )   576 - 579   2011.2

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  • Experimental study of mobile propagation loss correction formula for a slope terrain area Reviewed

    Takahiro Fujitani, Shigeru Tomisato, Masaharu Hata

    IEEE Vehicular Technology Conference   2010

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    Service area upgrading and expanding is expected in current and future cellular systems. Since residential areas on a hilly and/or slope terrain are spreading in the outskirts of cities in Japan, the correction for the urban mobile propagation loss formula becomes one of the important issues in radio link and cell layout designs in those areas, especially within 1km distance from a base station. This paper introduces an example of correction formula for the slope terrain area based on an experimental study of mobile path loss prediction. The result shows the path loss at the objective point can be estimated by the urban mobile path loss and the correction value according to the factor expressed by the elevation angle from the base station antenna top. Although the average slope angle is only used as a parameter in the conventional correction for the slope terrain area with at least 5 to 10km length, the result means it is not enough for the correction to the area within 1km distance from a base station. ©2010 IEEE.

    DOI: 10.1109/VETECF.2010.5594354

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  • An Adaptive Soft Clipping Method for Spectrum Sharing OFDMA Systems Reviewed

    Toshihisa Fujiwara, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura

    2009 IEEE 20TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS   305 - 309   2009.9

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    This paper proposes an adaptive soft clipping method for spectrum sharing OFDMA systems. The proposed method controls in-band and out-of-band distortion power by changing the nonlinearity parameter of soft clipping. The simulation results show that the proposed method can control the distortion power by 10 dB for a practical power amplifier. The results also show that a low-peak OFDMA transmitter can be realize with reasonable computational complexity because iterative processing for peak power reduction is unnecessary.

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  • A clipping noise canceller for iterative clipping and filtering in wireless OFDMA systems with nonlinear distortion Reviewed

    Yukari Mori, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura

    2009.9

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  • Experimental Study of BWA System Applied in an Intermediate and Mountainous Area Reviewed

    Makoto Ono, Yukiji Mikamo, Keisuke Ohtou, Masaharu Hata, Shigeru Tomisato

    TENCON 2009 - 2009 IEEE REGION 10 CONFERENCE, VOLS 1-4   1982 - +   2009.1

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    As one of the effective way to overcome the digital divide issue in the lightly populated area, the BWA (Broadband Wireless Access) system is expected and field trials have been conducted extensively in Japan. This paper introduces the results of BWA field experiments conducted in a typical intermediate and mountainous area in Japan. In the BWA network, WiMAX units are used as relay stations and R-LAN units are structuring the meshed network. The result shows that the study of effective frequency utilization is important to realize the multi-hop relaying. It is also suggested that the multiple channel transmission in the meshed network needs the topological node allocation study to reduce delay affects.

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  • In-lab Real-time Experiment of Interference Canceller TCC Implemented with Field Programmable Gate Array Reviewed

    MURATA Hidekazu, TSUKAMOTO Satoshi, TOMISATO Shigeru, MATSUMOTO Tadashi, YOSHIDA Susumu

    The Transactions of the Institute of Electronics,Information and Communication Engineers B   84 ( 7 )   1226 - 1232   2001.7

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    Other Link: http://hdl.handle.net/10119/4704

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Books

  • 無線通信の基礎技術

    オーム社  2014  ( ISBN:9784274216558

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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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  • Transmission Efficiency Improvement by Non-Liner Distortion Noise Power Control in Multi-Band Systems

    117 ( 132 )   167 - 170   2017.7

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  • Transmission Efficiency Improvement by Non-Liner Distortion Noise Power Control in Multi-Band Systems

    117 ( 134 )   145 - 148   2017.7

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  • Transmission Efficiency Improvement by Non-Liner Distortion Noise Power Control in Multi-Band Systems

    117 ( 130 )   113 - 116   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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  • Transmission Performance of Visible Light Communications Using Saturated LEDs

    116 ( 481 )   99 - 104   2017.3

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  • Transmission Quality Improvement by LED Back-off Optimization for Visible Light Wireless Communications

    Takahiro Chikamori, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

    Proc. of the 20th International Symposium on Wireless Personal Multimedia Communications, WPMC 2014   2017

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

    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 - J86   2017

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    DOI: 10.3169/itej.71.J80

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

    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 - J86   2017

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    DOI: 10.3169/itej.71.J80

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

    71 ( 2 )   J80-J86   2017

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  • Transmission Efficiency Improvement by Non-Linear Distortion Noise Power Control in Multi-Band Systems

    116 ( 276 )   111 - 114   2016.10

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  • A Non-Linear Distortion Compensation Method for Transmission Circuits of LED Visible Light Communications

    115 ( 474 )   7 - 10   2016.3

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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-1-21 A Study of Sloping Terrain Correction Equation for Urban Path Loss Estimation Formula

    Ohnishi Kohei, Shimada Kazuki, Hirahara Reika, Tomisato Shigeru, Hata Masaharu

    Proceedings of the IEICE General Conference   2016 ( 1 )   21 - 21   2016.3

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  • コグニティブ無線用OFDM送信機における変調方式に応じた非線形歪雑音制御手法

    IEICE Transaction B   J99-B ( 3 )   219 - 229   2016

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  • B-1-21 Path Loss Characteristic Comparisons for Sloping Service Areas Looking Down by Cellular Base Stations

    Ohnishi Kohei, Kamei Eita, Tomisato Shigeru, Hata Masaharu

    Proceedings of the Society Conference of IEICE   2015 ( 1 )   21 - 21   2015.8

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  • B-19-9 Transmission performance evaluation by LED non-linear distortion in visible light communications

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

    Proceedings of the Society Conference of IEICE   2015 ( 2 )   374 - 374   2015.8

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

    115 ( 189 )   55 - 58   2015.8

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  • A distortion noise power allocation method for cognitive radio transmitters

    115 ( 159 )   73 - 78   2015.7

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  • B-19-14 Experimental Evaluation of Error Vector Magnitude in LED Visible Light Communications

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

    Proceedings of the IEICE General Conference   2015 ( 2 )   640 - 640   2015.2

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  • A Study of Urban Path Loss Estimation for Slope Terrain Areas using Geographical Road Information

    SHIN Koichi, NISHI Masahiro, HATA Masaharu, ICHITSUBO Shinichi, TOMISATO Shigeru

    IEICE technical report. Antennas and propagation   114 ( 396 )   79 - 84   2015.1

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    In recent years, service areas in cellular systems by using microcells or femtocells are widespread. In the mobile radio link design, several path loss estimation formulas are used. Radio propagation characteristics of the mobile systems in the slope areas are, however, not clear. In this study, we tried to correct the formula in urban areas to fit into slope areas within the distance of 1km from the base station. We propose a correction method taking account of the vertical plane angle, and the ratio of parallel course with respect to the base station. The correction method is based on our measurements using 2,100MHz band radio waves in cellular systems under different slope environments in Hiroshima, Okayama and Kitakyusyu in Japan. As a result, it was confirmed that the correction was effective to estimate the propagation path loss in the different slope areas.

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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

    IEICE Transaction B   J98-B ( 10 )   1146 - 1154   2015

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  • Experimental Evaluation of Error Vector Magnitude in LTE Signal Transmission by Visible Light Communication

    MATSUNO Hiroaki, TOMISATO Shigeru, DENNO Satoshi, HATA Masaharu, FURUNO Tatsuo, ODA Yasuhiro

    IEICE technical report. SRW, Short range wireless communications   114 ( 367 )   35 - 38   2014.12

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    This paper experimentally evaluates broadband transmission performance of visible light communication using a transmission module circuit with a light emitting diode (LED) and a photodiode. In this experiment, OFDM signals of LTE systems are used and their error vector magnitude (EVM) is evaluated. The experimental results show that the EVM by transmission distance of 1.0 m is 4.5 % with 64QAM and its bandwidth of 5MHz. In addition, at the bandwidth of 20 MHz, the EVM by transmission distance of 0.5 m becomes less than 7.0 %.

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  • Non-Linear Distortion Noise Power Control According to Modulation Schemes for Cognitive Radio Systems (Smart Radio)

    KATAOKA Ren, FUJISAWA Yusuke, TOMISATO Shigeru, HATA Masaharu

    IEICE technical report. SR, Smart radio   114 ( 284 )   1 - 6   2014.10

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    This paper evaluates transmission performance of a low-priority system with a non-linear distortion noise power control (DNC) method which controls non-linear distortion noise power according to required transmission quality of modulation schemes in cognitive radio systems by OFDM transmission. This DNC method employs the conventional clipping and filtering method, and its clipping level and distortion noise power ratio for filtering are selected so that the required noise power condition on each frequency band is satisfied. Distortion noise power characteristics to clipping levels with the DNC method are evaluated by computer simulations and the set clipping levels and distortion noise power ratios for filtering are determined from these results. The results of spectrum properties and BER performance show that the DNC method can satisfy required transmission quality of modulation schemes on frequency bands used by a low-priority system.

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  • B-5-46 Transmission Performance by Iterative Clipping and Filtering in OFDM Transmission with Multiple Bands

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

    Proceedings of the Society Conference of IEICE   2014 ( 1 )   317 - 317   2014.9

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  • Transmission Performance of Adaptive Sensor Collaborative Beamforming with Frequency Offset

    FUJITA Masahiro, OGURA Akane, TOMISATO Shigeru, DENNO Satoshi, HATA Masaharu

    IEICE technical report. SRW, Short range wireless communications   114 ( 177 )   23 - 28   2014.8

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    Sensor collaborative beamforming by adaptive transmission has been proposed for wireless sensor networks. In the beamforming, beamforming processing and collaborative transmitting sensor selection are adaptively performed according to reception quality of a receiving sensor, and power-saving effect by the beamforming was evaluated without frequency offset between transmitting and receiving sensors. This paper evaluates power-saving effect of the beamforming with frequency offset by computer simulation. The simulation results show that total power consumption of the beamforming with 3 collaborative sensor candidates can be decreased by 43% even with the normalized offset frequency of 1.0×10^<-3> between transmitting and receiving sensors.

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  • Transmission Performance of Adaptive Sensor Collaborative Beamforming

    FUJITA Masahiro, TOMISATO Shigeru, DENNO Tetsushi, HATA Masaharu

    IEICE technical report   114 ( 163 )   27 - 32   2014.7

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    This paper evaluates transmission performance and power-saving effect of sensor collaborative beamforming by adaptive transmission in which beamforming and collaborative transmitting sensor selection are adaptively performed according to reception quality of a receiving sensor. In this method, beamforming is used only in retransmission. Transmission performance and power-saving effect are evaluated by computer simulation. The simulation results show that the Signal-to-Noise power Ratio (SNR) by adaptive sensor collaborative beamforming can be improved by 18.0 dB at the Cumulative Distribution Function (CDF) of 10^<-2>. Total power consumption of the beamforming with 3 collaborative sensor candidates can be decreased by 14 % even with the transmission phase error of 60° among collaborative transmitting sensors.

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  • A Distortion Noise Power Control Method of OFDM Transmission Systems for Cognitive Radio

    KATAOKA Ren, FUJISAWA Yusuke, TOMISATO Shigeru, HATA Masaharu

    IEICE technical report   114 ( 163 )   41 - 46   2014.7

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    This paper evaluates transmission performance with a non-linear distortion noise power control (DNC) method which controls non-linear distortion noise power according to required transmission quality of modulation schemes used in OFDM transmission systems for cognitive radio. This DNC method controls noise power added in a transmitter by clipping and filtering. Distortion noise power characteristics to clipping levels with the DNC method are evaluated by computer simulations and from these results the set clipping levels and distortion noise ratios for filtering are determined. The results of spectrum properties and BER performance with the DNC method show that the DNC method can control distortion noise power to satisfy required transmission quality of modulation schemes.

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  • Iterative Frequency Offset Estimation with Singular Value Decomposition for DS-SS Wireless Sensor Networks

    DENNO Satoshi, HASEBE Masataka, TOMISATO Shigeru, HATA Masaharu

    IEICE technical report. SRW, Short range wireless communications   114 ( 84 )   65 - 70   2014.6

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    This paper proposes a novel iterative frequency offset estimation for sensor networks with Direct Sequence Spread Spectrum : DS-SS. In the proposed scheme, frequency offset is estimated based on the singular value decomposition in conjunction with a decorrelator that is introduced to improve the estimation performance in intersymbol interference channels. Because the frequency offset estimation attains high estimation performance in co-channel interference channels, the proposed estimation scheme achieves superior performance not only in intersymbol interference channels with co-channel interference, but also in the channel with big frequency offset. It is confirmed by computer simulation that the proposed estimation scheme achieves superior performance in 5-path Rayleigh fading with CIR=0dB, as far as the frequency offset normalized by the symbol duration is less than 7×10^1.

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  • B-19-26 Effects of Transmission Phase Error in Adaptive Sensor Collaborative Beam Forming

    Fujita Masahiro, Beppu Takuya, Tomisato Shigeru, Denno Satoshi, Hata Masaharu

    Proceedings of the IEICE General Conference   2014 ( 2 )   658 - 658   2014.3

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  • B-5-22 Non-Linear Distortion Noise Reduction in OFDM Transmission with Multiple Bands

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

    Proceedings of the IEICE General Conference   2014 ( 1 )   417 - 417   2014.3

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  • Out-of-Band Distortion Noise of OFDM Transmission with Multiple Frequency Bands

    MASAKI Shohei, TOMISATO Shigeru, DENNO Satoshi, HATA Masaharu, FURUNO Tatsuo, ODA Yasuhiro

    IEICE technical report   113 ( 400 )   97 - 102   2014.1

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    This paper evaluates in-band and out-of-band distortion noise power caused by non-linearity of an OFDM transmitter with multiple frequency bands by computer simulations. In addition, the effect of in-band and out-of-band distortion noise power reduction by using a clipping and filtering method is evaluated according to the number and frequency of used bands and filtering methods. The results of computer simulations show that out-of-band noise power can be reduced by 8.5dB with the optimized clipping level and filtering.

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  • 第三世代移動通信システムの国際標準化への取組み

    秦 正治, 佐藤 孝平

    電子情報通信学会通信ソサイエティマガジン B-plus   2014 Autumn ( 30 )   91 - 94   2014

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  • センサネットワークシステムのための特異値分解を用いた繰返し周波数オフセット推定

    IEICE Transaction B   J97-B ( 12 )   1199 - 1212   2014

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  • Path Loss Prediction Model for a Sloped Area in Microcell Based on Scale Model and Real Environment Measurements Reviewed

    Takanori Seo, Hideaki Yukue, Takuya Kuribayashi, Takuya Tsutsumi, Shinichi Ichitsubo, Masaharu Hata, Shigeru Tomisato

    2014 IEEE ASIA PACIFIC CONFERENCE ON WIRELESS AND MOBILE   78 - 83   2014

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    We propose a model for predicting the path loss of a sloped area in a microcell service area of a mobile communication system. This is the prediction model to be proposed that targets a microcell. For practical use, a model requires parameters such as the base station height, angle of the sloped area, and distance from the base station to the sloped area. The proposed model uses a correction method based on the characteristics of the base station height to predict the path loss of the sloped area based on the path loss of flat terrain. The proposed model is verified based on measurements of a scale model and real environments. A 1/70 scale model is constructed of a residential area and the path losses are measured at 10.5 GHz. In real environments, the path losses are measured at 902 MHz. The measurement results show that the path losses predicted using the proposed model are close to the measured results.

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

    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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  • Iterative SVD-based Frequency Offset Estimation with Decorrelation for Wireless Sensor Networks

    Satoshi Denno, Masataka Hasebe, Shigeru Tomisato, Masaharu Hata

    2014 INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS (WPMC)   146 - 151   2014

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    This paper proposes an iterative frequency offset estimation scheme for wireless sensor networks with direct-sequence spread spectrum. The proposed scheme is able to estimate large frequency offset that may occur at the receiver on devices with a sensor by iterating singular value decomposition (SVD)-based frequency offset estimation. In the proposed estimation scheme, a decorrelator is inserted in the iteration cycle that reduces the correlation between the received signals in order to improve the estimation performance, even in multipath fading channel with co-channel interference. It is confirmed by computer simulation that the proposed estimation scheme achieves exact frequency offset estimation in the channel, even when the frequency offset normalized by the symbol duration is 7 x 10(1).

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  • A Study on Mobile Radio Propagation Path Loss Characteristics in Consideration of Several Slope Areas

    2013 ( 12 )   1 - 8   2013.11

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  • A Study of Path Loss Correction Formula for Different Slope Terrain Areas

    Hirai Takanori, Hayashi Kazuki, Shin Koichi, Nishi Masahiro, Hata Masaharu, Tomisato Shigeru

    Proceedings of the Society Conference of IEICE   2013 ( 1 )   7 - 7   2013.9

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  • Frequency Band Utilization Efficiency to Sub-Carrier Spacing of Spectrum Sharing Systems

    IKEDA Atsushi, TOMISATO Shigeru, HATA Masaharu

    Proceedings of the Society Conference of IEICE   2013 ( 1 )   381 - 381   2013.9

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  • Transmission Performance Improvement of Sensor Collaborative Beam Forming by Adaptive Transmission

    BEPPU Takuya, FUJITA Masahiro, TOMISATO Shigeru, DENNO Satoshi, HATA Masaharu

    IEICE technical report. SRW, Short range wireless communications   113 ( 180 )   33 - 36   2013.8

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    This paper proposes a sensor collaborative beam forming method by adaptive transmission in which beam forming and collaborative transmitting sensor selection are adaptively performed according to reception quality of a receiving sensor. In this method, beam forming is used only in retransmission. Average Bit Error Rates (BERs) and Signal-to-Noise power Ratio (SNR) distribution in a receiving sensor are evaluated by computer simulation. The results show that the proposed method can improve the required E_b/N_0 for the average BER of 10^<-3> by 4.0 to 13.4 dB compared with that without beam forming. SNR distribution can also be improved by 5.8 to 19.8 dB at the Cumulative Distribution Function (CDF) of 10^<-2>.

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  • A Transmission Power Control Method by Interference Power Estimation in Shared Frequency Bands

    IKEDA Atsushi, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu

    Technical report of IEICE. RCS   113 ( 8 )   101 - 106   2013.4

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    This paper evaluates interference power reduction effect with the proposed transmission power control (TPC) method for low-priority systems by accurate estimation of interference power in high-priority systems before signal transmission in spectrum sharing systems. The utilization efficiency of the low-priority system with the TPC method in shared frequency bands is also evaluated. The results of computer simulations show that the TPC method can reduce interference power to less than permissible interference power of the high-priority system in the shared transmission power control band. The results also show that the total power ratio of -0.5dB for the low-priority system can be achieved in the band at transmission power reduction of 20dB.

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  • B-5-82 Unused-Band Utilization Effriciency of Spectrum Sharing Systems by lnterference Power Estimation

    Ikeda Atsushi, Tomisato Shigeru, Fujii Hiromasa, Hata Masaharu

    Proceedings of the IEICE General Conference   2013 ( 1 )   492 - 492   2013.3

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  • An Interference Power Estimation Method for Low-Priority Systems in Spectrum Sharing Systems

    IKEDA Atsushi, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu

    IEICE technical report   112 ( 406 )   33 - 38   2013.1

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    This paper proposes a new transmission power control method for low-priority systems by the accurate estimation of interference power in high-priority systems before signal transmission. In the proposed method, the received spectrum of 1 sub-carrier in the high-priority system is calculated, and whole interference to the high-priority system is calculated by using the calculation result. The results of computer simulations show that the proposed method can reduce interference power to less than permissible one of the high-priority system in the shared transmission power control band.

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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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  • SVD-based frequency offset estimation in the presence of co-channel interference for DS-SS sensor networks

    Masataka Hasebe, Satoshi Denno, Shigeru Tomisato, Masaharu Hata

    2013 International Conference on Sensor Network and Mobile Computing, ICSNMC 2013   24.1-24.5 - 24.5   2013

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  • 周波数共用システムにおけるブロックコンバータの飽和によるOFDM信号の帯域外ふく射電力推定

    冨里 繁, 藤井 啓正, 秦 正治

    電子情報通信学会論文誌B   J96-B ( 8 )   850 - 858   2013

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  • センサネットワークシステムのための同一チャネル干渉下での周波数オフセット推定法

    松本 祐也, 田野 哲, 冨里 繁, 秦 正治

    電子情報通信学会論文誌B   J96-B ( 2 )   171 - 179   2013

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  • Out-of-band distortion noise power estimation of OFDM signals caused by low noise block converter saturation in spectrum sharing

    TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu

    IEICE Transaction B   J96-B ( 8 )   850 - 858   2013

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  • Highly accurate estimation of frequency offset in wireless sensor network systems

    IEICE Transaction B   J96-B ( 2 )   171 - 179   2013

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  • B-5-47 A Non-Linear Distortion Noise Control Method for Adaptive Modulation in Spectrum Sharing

    OKAMOTO Seiichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Proceedings of the Society Conference of IEICE   2012 ( 1 )   411 - 411   2012.8

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  • Transmission Performance Improvement by Non-Linear Distortion Noise Control in Spectrum Sharing

    OKAMOTO Seiichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Technical report of IEICE. RCS   112 ( 192 )   31 - 36   2012.8

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    On spectrum sharing systems, transmission power control (TPC) effectively works to avoid harmful inter-system interference by reducing transmission power of a low-priority system in shared bands. In such cases, however, non-linear distortion noise severely affects transmission quality of low-priority TPC users because their transmission power is reduced. This paper proposes a non-linear distortion noise control method for adaptive modulation based on a clipping and filtering method to improve reception quality of the low-priority TPC users. The proposed method adaptively filters non-linear distortion noise in TPC bands according to required transmission quality of modulation schemes. From the relation between clipping levels and the non-linear distortion noise power when applying OFDM transmission, threshold levels for clipping and distortion noise power ratios for filtering used with the proposed method are investigated by computer simulations. Spectrum properties and BER performance with the proposed method are also evaluated. The results show the proposed method can meet required transmission quality according to modulation schemes of the low-priority users when sharing spectrum with TPC.

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  • A Generalization of WDS Clustering Algorithm Extension to Smart-Antenna in Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    IEICE technical report   112 ( 8 )   37 - 42   2012.4

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    As a scalable inexpensive Internet-access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). Because all the traffics pass through an Internet gateway (GW) in WIMNET, the resolution of link congestions around the GW is very important. For this problem, we have proposed a WDS clustering algorithm to partition the APs into a set of WDS clusters where the APs in each cluster shares an GW, and have considered the adoption of a smart antenna for a Smart AP (SAP). Since the smart antenna is usually expensive, we have extended the WDS clustering algorithm to a cluster where only one or two SAPs are used. In this paper, we generalize this extension to a cluster with an arbitrary number of SAPs. Besides, we investigate the priority action of the smart antenna for multiple SAPs in one cluster. We evaluate the effectiveness through simulations using grid topology instances.

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  • B-5-25 An Adaptive Non-Linear Distortion Noise Reduction Method for Spectrum Sharing Systems

    Okamoto Seiichiro, Tomisato Shigeru, Fujii Hiromasa, Hata Masaharu, Miura Shunji, Kayama Hidetoshi

    Proceedings of the IEICE General Conference   2012 ( 1 )   424 - 424   2012.3

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

    MATSUMOTO Yuya, DENNO Satoshi, TOMISATO Shigeru, HATA Masaharu

    Technical report of IEICE. RCS   111 ( 404 )   115 - 120   2012.1

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    In wireless sensor networks, sensor collaborative beam forming in which plural transmitting sensors collaborate to form a signal beam has been studied to realize highly reliable transmission. In the beam forming, if there is frequency offset between transmitters and their receiver, the combined power by the beam forming decreases and it results in transmission performance degradation. This paper proposes a highly accurate estimation method of frequency offset under inter-symbol interferences owing to multipath propagation and co-channel interferences. The proposed method decomposes correlation matrix made from pilot signals into eigenvalues and estimates frequency offset from the eigenvector of the maximum eigenvalue. Under multipath propagation and co-channel interference conditions, the computer simulation results show that the proposed method can achieve estimation error of less than 1.0x10^<-4>, when the normalized frequency offset by a chip period in each pilot signal is 1.0x10^<-3>. This shows that the proposed method can realize highly accurate estimation of frequency offset even under multipath propagation and co-channel interference conditions.

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  • Non-Linear Distortion Noise Control by Clipping and Filtering in Spectrum Sharing Systems

    Seiichiro Okamoto, Shigeru Tomisato, Hiromasa Fujii, Masaharu Hata, Shunji Miura, Hidetoshi Kayama

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

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    This paper proposes a non-linear distortion noise control method for secondary systems in spectrum sharing. The proposed method is based on conventional clipping and filtering methods, and adaptively shapes distortion noise power to improve reception quality of secondary users with transmission power control. In this paper, optimal clipping levels to control in-band distortion noise are investigated, and then the spectrum property and BER performance with the clipping levels are evaluated. The results confirm that the proposed method can control the distortion power effectively in shared bands and realize secondary systems with less degradation of reception quality when sharing spectrum with transmission power control.

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  • An Adaptive Non-Linear Distortion Noise Control Method for Spectrum Sharing Systems

    Seiichiro Okamoto, Shigeru Tomisato, Hiromasa Fujii, Masaharu Hata, Shunji Miura, Hidetoshi Kayama

    18TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC 2012): GREEN AND SMART COMMUNICATIONS FOR IT INNOVATION   272 - 277   2012

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    This paper proposes an adaptive non-linear distortion noise control method for low-priority systems under spectrum sharing environments. The proposed method adaptively controls distortion noise power of a transmitter to improve reception quality of shared bands with transmission power control. The distortion power is reduced to meet a required transmission quality. In this paper, the spectrum property and BER performance with the method are evaluated by computer simulations. The results confirm that the proposed method can effectively reduce the distortion power and adaptively control transmission SNRs according to the required transmission quality.

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  • A Study of Mobile Path Loss Estimation Models for a Sloping Terrain Area in Cellular Systems

    Tomohiro Ohira, Takanori Hirai, Shigeru Tomisato, Masaharu Hata

    18TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC 2012): GREEN AND SMART COMMUNICATIONS FOR IT INNOVATION   472 - 477   2012

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    Mobile path loss estimation models for small cell area on a sloping terrain become important function in the radio link design of cellular systems. Okumura and Lee models are known for the sloping terrain path loss estimation, but the applicable cell size is lager than today's small cell area with less than 1.5km radius. Recently, a new estimation model called Fujitani model has been proposed for such a small cell including sloping terrain area. However, there were no comparison discussions about the estimation by the other models. In this paper, the path loss estimation comparisons by Okumura, Fujitani, and Lee models are discussed based on the same data measured in a typical short distance sloping terrain area. The result shows that Fujitani model is prospective for such sloping terrain path loss estimation in a small cell, but further measurement studies in various slope terrain areas and additional parameter considerations are needed to realize general applicability.

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  • An extension of clustering algorithm for smart-antenna use in wireless mesh networks

    Shigeto Tajima, Nobuo Funabiki, Shigeru Tomisato, Masaharu Hata, Teruo Higashino

    1st IEEE Global Conference on Consumer Electronics 2012, GCCE 2012   638 - 642   2012

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    As a scalable cost-efficient Internet-access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). Because all the traffics pass through an Internet Gateway (GW), the resolution of link congestions around the GW is very important. To solve this problem, we have proposed a clustering algorithm to partition the APs into a set of clusters where each cluster consists of the APs sharing the same GW. In addition, we have considered the use of a smart antenna at a special AP called a Smart AP (SAP). In this paper, we extend this clustering algorithm for smart antenna use at SAPs. Besides, we investigate the link activation strategy for the smart antenna, because it allows a variety of link activations for packet transmissions. We evaluate the effectiveness through simulations using the WIMNET simulator. © 2012 IEEE.

    DOI: 10.1109/GCCE.2012.6379939

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  • Non-Linear Distortion Noise Control for Spectrum Sharing Systems

    OKAMOTO Seiichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Technical report of IEICE. RCS   111 ( 345 )   165 - 170   2011.12

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    Recently, a spectrum sharing method between wireless communication systems has been studied to use frequency resources with much higher efficiency. In general, different systems for spectrum sharing have different system bandwidths. Therefore, spectrum sharing systems such that a low-priority system has wider frequency bands than a high-priority system should be considered. In such spectrum sharing environments, reducing transmission power of the low-priority system in partial frequency bands overlapped with the high-priority system is considered to work effectively so as to avoid harmful interference to the high-priority system. This paper proposes a non-linear distortion noise control method based on a clipping and filtering method for the low-priority system to improve reception quality degradation which occurs in shared bands whose transmission power is reduced. The proposed method adaptively controls distortion noise power in shared bands with transmission power control according to the amount of the reduced power. In this paper, optimal clipping levels, required parameters in the proposed method, are investigated, and then the spectrum property and BER performance with the optimal clipping levels are evaluated by computer simulations. The results confirm that the proposed method can significantly improve reception quality of the low-priority system in shared bands with transmission power control.

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  • A Clustering Algorithm for WDS Clusters with Two Access-Points Using Smart Antenna in Wireless Mesh Networks

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    Technical report of IEICE. RCS   111 ( 345 )   81 - 86   2011.12

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    As a scalable Internet access network, we have studied the Wireless Internet-access Mesh Network (WIMNET) that is composed of multiple access point (APs) connected through the Wireless Distribution System (WDS). For large scale WIMNET, because the traffic through the Internet gateway (GW) becomes very high, it is composed of multiple WDS clusters where one cluster consists of APs sharing the same GW. Even in this hierarchial WIMNET, links around the GW are still crowded in each WDS cluster and may become bottlenecks of whole communications. Hence, we have proposed the adoption of a Smart AP (SAP) using the smart antenna technology for bandwidth enhancements. In this paper, we propose an extension of our WDS clustering algorithm for WIMNET such that the GW and one adjacent AP are selected as SAPs in each WDS cluster. Through simulations using grid topology instances, we verify the effectiveness of our algorithm extension.

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  • B-5-79 Inter-Sub-Carrier Interference Power Evaluated by Sub-Carrier Spacing of Spectrum Sharing Systems

    SAEKI Takuya, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Proceedings of the Society Conference of IEICE   2011 ( 1 )   458 - 458   2011.8

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  • B-5-20 Non-Linear Distortion Noise Reduction for Spectrum Sharing Systems

    OKAMOTO Seiichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Proceedings of the Society Conference of IEICE   2011 ( 1 )   399 - 399   2011.8

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  • A WDS Clustering Algorithm for Wireless Mesh Network with Gateway using MIMO Channel

    TAJIMA Shigeto, FUNABIKI Nobuo, TOMISATO Shigeru, HATA Masaharu, HIGASHINO Teruo

    IEICE technical report   111 ( 8 )   55 - 60   2011.4

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    We have studied the Wireless Internet-access Mesh NETwork (WIMNET) as a scalable wireless local area network that is composed of multiple access points (APs) connected through the Wireless Distribution System (WDS). To avoid the performance degradation due to traffic overloads, the number of APs in a single WDS is limited. Hence, we have proposed a WDS clustering algorithm to partition a given set of APs into a disjoint set of WDS clusters where the APs in one WDS cluster shares a single gateway (GW) to the Internet and are connected by a single WDS. As all the traffics from/to the Internet pass through the GW in a WDS cluster, links incident to the GW can be bottlenecks of whole communications. In this paper, in order to increase the throughput there by adopting the MIMO channel at the GW, we propose an extension of the WDS clustering algorithm to the WIMNET with the MIMO channel GW. Through simulations using several instances, we verify the effectiveness of our algorithm extension.

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  • B-5-105 Interference Power Regrowth of Spectrum Sharing Systems with Non-Linear Distortion

    SAEKI Takuya, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji, KAYAMA Hidetoshi

    Proceedings of the IEICE General Conference   2011 ( 1 )   491 - 491   2011.2

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  • An Iterative Peak Power Reduction Method with Adaptive Intermediary Over-Sampling for Wireless OFDMA Systems

    Kazuhiko Fujimoto, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii

    IEICE TRANSACTIONS ON COMMUNICATIONS   E94B ( 2 )   576 - 579   2011.2

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    This paper proposes an iterative peak power reduction method with adaptive intermediary over-sampling which uses the necessary minimum bandwidth according to iteration number for wireless OFDMA systems. The required bandwidth to each iteration number is evaluated by computer simulation, and over-sampling numbers in iterative processing are controlled by using the simulation results. The results show that the required bandwidth is 1.6, 2.0, and 2.7 times of the used signal bandwidth at the iteration number of 1, 2, and 3, respectively. The proposed adaptive over-sampling method can reduce its multiplication number by 13%.

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  • Sensor Collaborative Beam Forming with Low-Complexity Signal Processing

    IEICE Transaction B   J94-B ( 2 )   137 - 146   2011

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  • An extension of active access-point selection algorithm for throughput maximization in wireless mesh networks

    Nobuo Funabiki, Junki Shimizu, Toru Nakanishi, Kan Watanabe, Shigeru Tomisato

    Proceedings - 3rd IEEE International Conference on Intelligent Networking and Collaborative Systems, INCoS 2011   367 - 372   2011

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    In order to offer an inexpensive, scalable Internetaccess wireless network, we have studied the architecture, protocols, and design optimizations of the wireless Internet-access mesh network (WIMNET) that adopts multiple access-points (APs) connected by wireless links. WIMNET can improve the dependability to failures of links and/or APs by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences, only the necessary APs for the connectivity between the hosts and the Internet gateway should be activated in communications. Previously, we have defined the active AP selection problem of selecting the minimum number of active APs, and proposed its heuristic algorithm. However, the throughput should be maximized in WIMNET as a bandlimited wireless network, even if the number of active APs is slightly increased. In this paper, we propose the extension of the active AP selection algorithm for the throughput maximization using the average hop count. We confirm the effectiveness of our algorithm extension through simulations in three instances, where the throughput is improved by about 10% with 7-14 additional active APs on average. © 2011 IEEE.

    DOI: 10.1109/INCoS.2011.50

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  • An active access-point selection approach for dependable wireless mesh networks

    Nobuo Funabiki, Junki Shimizu, Masaharu Hata, Shigeru Tomisato, Toru Nakanishi, Kan Watanabe

    Journal of Interconnection Networks   12 ( 3 )   137 - 154   2011

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    As an inexpensive, flexible, and scalable Internet-access wireless network, we have studied the architecture, protocols, and design optimizations of the Wireless Internet-access Mesh NETwork (WIMNET) that adopts multiple access-points (APs) connected through wireless links. WIMNET can improve the dependability to failures of APs and/or their links by allocating APs redundantly in the network field. Because redundant APs may increase the operational cost and degrade the throughput due to increasing radio interferences, only the necessary APs for connectivity between the hosts and the Internet gateway should be activated in communications. In this paper, we first define the active AP selection problem of selecting the minimum number of active APs, and prove the NP-completeness of its decision version through reduction from the known minimum set cover problem. Then, we propose an active AP selection algorithm of deactivating APs one by one until no more AP can be deactivated. Due to the limited transmission capacity in WIMNET, we further present an algorithm extension for throughput maximization. We verify the effectiveness of our proposal through simulations in three instances, where the number of active APs is reduced by more than 40% and the throughput is improved by more than 10% from the original in any instance. © 2011 World Scientific Publishing Company.

    DOI: 10.1142/S0219265911002915

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  • A smart access-point selection algorithm for scalable wireless mesh networks

    IAENG International Journal of Computer Science   38 ( 3 )   260 - 267   2011

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  • Interference power regrowth of spectrum sharing systems with non-linear distortion

    The 7th IEEE VTS Asia Pacific Wireless Communication Symposium, APWCS 2011   MA1   1 - 5   2011

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  • 簡易な信号処理を用いるセンサ協調型ビーム形成法の検討

    中野 淳次郎, 駒田 善紀, 冨里 繁, 田野 哲, 秦 正治

    電子情報通信学会論文誌B   J94-B ( 2 )   137 - 146   2011

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  • A throughput evaluation of wireless Internet-access mesh network using MIMO and adaptive array antenna

    Shigeto Tajima, Nobuo Funabiki, Shigeru Tomisato, Masaharu Hata, Teruo Higashino

    The 2011 International Workshop on Smart Info-Media System in Asia (SISA 2011)   79 - 84   2011

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  • Interference Properties of OFDMA Systems and under Spectrum Sharing Environment

    FUKUDA Yuichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, MIURA Shunji

    IEICE technical report   110 ( 340 )   233 - 238   2010.12

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    This paper evaluates interference reduction effects by transmission power control (TPC) under spectrum sharing environment between different wireless systems in which an OFDMA system is assumed for the interfering system and the power density on a part of the interfering system band is reduced. The results of the computer simulations show that the undesired spectrum regrowth is caused by inter-sub-carrier interference, which results in degradation of interference reduction effects, and it is larger around the both ends of the TPC band. The spectrum regrowth on the TPC band is less than 1dB from the set transmission power density except 16 sub-carriers close to the band with default power density, when the transmission power density of the TPC band is 20 dB below the default density. On the other hand, the spectrum regrowth becomes more than 5 dB even around the center of the TPC band, when the transmission power density is reduced by -40 dB. Moreover, we also clarified the BER performance degradation on the victim system due to the spectrum regrowth.

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  • B-1-18 A Study of Slope Terrain Area Correction for the Urban Path Loss Estimation Formula

    Fujitani Takahiro, Kohno Tatsushi, Tomisato Shigeru, Hata Masaharu

    Proceedings of the Society Conference of IEICE   2010 ( 1 )   18 - 18   2010.8

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  • B-5-83 Out-of-band Distortion Power with an LNB in Spectrum Sharing

    FUKUDA Yuichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, ASAI Takahiro, OKUMURA Yukihiko

    Proceedings of the IEICE General Conference   2010 ( 1 )   515 - 515   2010.3

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  • B-17-23 A Study on Evaluation Non-linear Distortion of LNBs using Non-linear Models

    Fujii Hiromasa, Asai Takahiro, Okumura Yukihiko, Akazawa Hayato, Sotoyama Takayuki, Fukuda Yuichiro, Tomisato Shigeru, Hata Masaharu

    Proceedings of the IEICE General Conference   2010 ( 1 )   672 - 672   2010.3

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  • 可変フィルタリングによるOFDM伝送用ピーク電力低減信号の段階的生成法

    鳥羽 倫太郎, 冨里 繁, 秦 正治, 藤井 啓正

    電子情報通信学会論文誌B   J93-B ( 5 )   769 - 780   2010

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  • Performance evaluation of mobile relay transmission with non-linear amplifiers

    URSI Asia-Pacific Radio Science Conference, AP-RASC’10   CBDFK-4   1 - 1   2010

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  • Experimental Study of Mobile Propagation Loss Correction Formula for a Slope Terrain Area

    Takahiro Fujitani, Shigeru Tomisato, Masaharu Hata

    2010 IEEE 72ND VEHICULAR TECHNOLOGY CONFERENCE FALL   1B.4   1 - 5   2010

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    Service area upgrading and expanding is expected in current and future cellular systems. Since residential areas on a hilly and/or slope terrain are spreading in the outskirts of cities in Japan, the correction for the urban mobile propagation loss formula becomes one of the important issues in radio link and cell layout designs in those areas, especially within 1km distance from a base station. This paper introduces an example of correction formula for the slope terrain area based on an experimental study of mobile path loss prediction. The result shows the path loss at the objective point can be estimated by the urban mobile path loss and the correction value according to the factor expressed by the elevation angle from the base station antenna top. Although the average slope angle is only used as a parameter in the conventional correction for the slope terrain area with at least 5 to 10km length, the result means it is not enough for the correction to the area within 1km distance from a base station.

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  • A study on applying nonlinear models for spectrum shape estimation

    Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura, Ikuo Hiradate, Hayato Akazawa, Takayuki Sotoyama, Yuichiro Fukuda, Shigeru Tomisato, Masaharu Hata

    2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010   212.4   1 - 4   2010

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    In this study, it is investigated the validity of applying nonlinear device model to estimate distorted spectrum shapes of the OFDM signals for spectrum sharing studies. We used an LNA and two LNBs, which are off-the-shelf devices and the spectrum shape of OFDM signal distorted by the nonlinear devices, are evaluated by the means of model-based estimation and indoor experiment. As the results, the spectrum shapes obtained by the two evaluation show good agreement, thus the model-based estimation is considered to be an effective method on the spectrum sharing studies. © 2010 IEEE.

    DOI: 10.1109/ICWITS.2010.5611834

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  • Out-of-band distortion of OFDM transmission caused from low noise block converters

    Yuichiro Fukuda, Shigeru Tomisato, Hiromasa Fujii, Masaharu Hata, Takahiro Asai, Yukihiko Okumura

    2010 IEEE International Conference on Wireless Information Technology and Systems, ICWITS 2010   212.3   1 - 4   2010

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    We evaluated out-of-band distortion of OFDM signals caused by LNBs for FSS systems, which might be also important for spectrum sharing between the IMT-Advanced system and FSS expected from the result of WRC'07. The evaluation results show that the input power of interfering signals should not exceed -60dBm to make ACLR less than -50dB. The results also show that the AM-AM characteristic is the dominant factor to decide spectral properties, while AM-PM characteristics might be important for accurate estimation of out-of-band distortion by a part of non-linear amplifiers. © 2010 IEEE.

    DOI: 10.1109/ICWITS.2010.5611819

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  • B-5-80 Spectrum Properties of OFDMA Systems with Transmission Power Control

    FUKUDA Yuichiro, TOMISATO Shigeru, FUJII Hiromasa, HATA Masaharu, ASAI Takahiro, OKUMURA Yukihiko

    Proceedings of the Society Conference of IEICE   434 - 434   2010

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  • Spectrum Property of DFTS-OFDM Transmission with Nonlinear Distortion

    FUKUDA Yuichiro, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, ASAI Takahiro, OKUMURA Yukihiko

    IEICE technical report   109 ( 341 )   167 - 172   2009.12

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    This paper evaluates spectrum property of DFTS-OFDM transmission with non-linear distortion of a transmission power amplifier by computer simulations. N-times DFTS-OFDM transmission, which uses plural DFTs, and Clustered DFTS-OFDM transmission, in which DFT output signals are divided into plural clusters, are used in the simulations. The simulation results show that the PAPR of N-times DFTS-OFDM transmission with four DFTs increases by 2.0dB at the maximum compared with that with one DFT. In Clustered DFTS-OFDM transmission with four clusters, the maximum PAPR increase is 1.4dB. Although the out-of-band distortion power ratio with the input back-off value of 4dB is -30dB in both transmission systems, the devised sub-carrier mapping can reduce the occupied bandwidth of the distortion power. Clustered DFTS-OFDM transmission can especially reduce in-band distortion power by 4.5dB compared with N-times DFTS-OFDM transmission.

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  • B-5-63 Distortion Power Control Performance with Soft-clipping for Wireless OFDMA Systems

    FUJIWARA Toshihisa, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, ASAI Takahiro, OKUMURA Yukihiko

    Proceedings of the Society Conference of IEICE   2009 ( 1 )   412 - 412   2009.9

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  • B-5-14 Performance Evaluation of DFTS-OFDM Transmission with Nonlinear Distortion

    FUKUDA Yuichiro, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, ASAI Takahiro, OKUMURA Yukihiko

    Proceedings of the Society Conference of IEICE   2009 ( 1 )   363 - 363   2009.9

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  • Out-of-band distortion power reduction by soft-clipping for wireless OFDMA systems

    FUJIWARA Toshihisa, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, ASAI Takahiro, OKUMURA Yukihiko

    IEICE technical report   109 ( 105 )   13 - 16   2009.6

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    This paper proposes an adaptive control method for soft clipping which is one of effective peak power reduction methods in Orthogonal Frequency Division Multiple Access (OFDMA) systems. The proposed method can control in-band and out-of-band distortion power according to the using rate of the system band and the required transmission quality. The out-of-band distortion power with soft clipping can be reduced by 6dB compared with hard clipping. The simulation results show that a low-distortion OFDMA transmitter can be realize with reasonable computational complexity because iterative processing is unnecessary.

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  • B-5-69 Performance Evaluation of a Clipping Noise Canceller in OFDMA Systems with Nonlinear Distortion

    MORI Yukari, KUSUNOKI Kaori, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the IEICE General Conference   2009 ( 1 )   502 - 502   2009.3

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  • B-5-80 Out-of-Band Spectrum Property in Wireless OFDM Systems with Adaptive Soft Clipping

    FUJIWARA Toshihisa, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the IEICE General Conference   2009 ( 1 )   513 - 513   2009.3

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  • Required Bandwidth and Peak Power Reduction Effect of Intermediary Over-Sampling for Wireless OFDMA Systems

    FUJIMOTO Kazuhiko, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    IEICE technical report   108 ( 390 )   7 - 12   2009.1

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    This paper evaluates the required bandwidth to iterative peak power reduction to exactly reduce PAPRs in the proposed intermediary over-sampling method that can reduce computational complexity in OFDMA transmitters. The results of computer simulations show that the required bandwidth is 1.6, 2.0, and 2.7 times of the used signal bandwidth at the iteration number of 1, 2, and 3, respectively. In addition, the results show the iterative peak power reduction method with intermediary FFT/IFFT points can achieve the same BER performance as the usual over-sampling method.

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  • B-5-66 Transmission Performance of OFDMA System with Intermediary Over-Sampling

    FUJIMOTO Kazuhiko, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   379 - 379   2008.9

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  • B-1-9 Approximate expression for the ground cover factor used in a mobile path loss estimation

    Shiomi Takamine, Kawamura Masahiko, Shimamori Takao, Komatsu Satoru, Hata Masaharu, Tomisato Sigeru

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   9 - 9   2008.9

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  • B-5-68 Adaptive Peak-Reduction Sub-Carrier Insertion for OFDM Transmission with Low Peak Power

    Toba Rintarou, Tomisato Shigeru, Hata Masaharu, Fujii Hiromasa, Yoshino Hitoshi

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   381 - 381   2008.9

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  • B-5-86 Experimental study of BWA system applied in an intermediate and mountainous area : Radio link design

    Ono Makoto, Hata Masaharu, Tomisato Sigeru, Mikamo Yukiji

    Proceedings of the Society Conference of IEICE   2008 ( 1 )   399 - 399   2008.9

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  • A Two-Stage Generating Method of Peak Power Reduction Signals for OFDM Transmission

    R. Toba, S. Tomisato, M. Hata, H. Fujii, H. Yoshino

    Proc. of IEEE APWCS 2008   T14-3-1-T14-3-5 - T14-3-5   2008

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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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  • An Intermediary Over-Sampling Method in Iterative Peak Power Reduction for Wireless OFDMA Systems

    K. Fujimoto, N. Tominaga, S. Tomisato, M. Hata, H. Fujii, H. Yoshino

    Proc. of IEEE APWCS 2008   T14-4-1-T14-4-5 - T14-4-5   2008

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  • B-5-7 An Efficient Iterative Peak Power Reduction Method for OFDMA Systems

    FUJIMOTO Kazuhiko, TOMINAGA Naoshi, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the IEICE General Conference   393 - 393   2008

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  • B-5-6 A Two-Stage Generating Method for Peak Power Reduction Signals in OFDM Transmission

    TOBA Rintaro, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the IEICE General Conference   392 - 392   2008

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  • B-5-73 Transmission Performance Evaluation of a Low-Peak OFDMA System with Clipping

    MITSUFUJI Naoto, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, HAGIWARA Junichirou

    Proceedings of the Society Conference of IEICE   2007 ( 1 )   395 - 395   2007.8

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  • B-5-72 Transmission Performance of Low-Peak-Power OFDM signals by using Power Amplifier with Non-Linear Distortion

    FUJISAWA Toru, FUJII Hiromasa, TOMISATO Shigeru, HATA Masaharu, HAGIWARA Junichirou

    Proceedings of the Society Conference of IEICE   2007 ( 1 )   394 - 394   2007.8

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  • Peak reduction improvement in iterative clipping and filtering with a graded band-limiting filter for OFDM transmission Reviewed

    Toshiyuki Matsuda, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Junichiro Hagiwara

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 7 )   1362 - 1365   2007.7

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    The large PAPR of orthogonal frequency division multiplexing (OFDM) transmission is one of the serious problems for mobile communications that require severe power saving. Iterative clipping and filtering is an effective method for the PAPR reduction of OFDM signals. This paper evaluates PAPR reduction effect with a graded band-limiting filter in the iterative clipping and filtering method. The evaluation result by computer simulation shows that the excellent peak reduction effect can be obtained in the fewer iteration numbers by using a roll-off filter instead of the conventional rectangular filter, and the iteration number with the roll-off filter achieving the same PAPR is fewer by twice. The result confirms that the clipping and filtering method by using a graded band-limiting filter can achieve low peak OFDM transmission with less computational complexity.

    DOI: 10.1093/ietfec/e90-a.7.1362

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  • B-5-98 A Peak Reduction Method with Low Out-of-Band Emission Power for OFDM Transmission

    FUJISAWA Toru, MATSUDA Toshiyuki, FUJII Hiromasa, TOMISATO Shigeru, HATA Masaharu, HAGIWARA Junichirou

    Proceedings of the IEICE General Conference   2007 ( 1 )   512 - 512   2007.3

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  • An iterative peak-power reduction method applicable to OFDMA systems for broadband wireless communications

    Shigeru Tomisato, Masaharu Nishizaki, Masaharu Hata, Hiromasa Fujii, Junichiro Hagiwara

    2007 PROCEEDINGS OF THE 16TH IST MOBILE AND WIRELESS COMMUNICATIONS, VOLS 1-3   738 - +   2007

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    In this paper, we propose a new peak power reduction method applicable to OFDMA systems for broadband wireless communications, in which a user uses some frequency bands in all system bands, by using iterative peak reduction. The proposed method separates the system bands into an information signal band and peak-reduction signal insertion bands, and generates peak-reduction signals in the peak-reduction signal insertion bands by using iterative signal processing. Moreover, low power peak-reduction signals are generated in the information signal band to improve peak-reduction performance. The results by computer simulations show that the proposed method can achieve the PAPR reduction of 3 to 4dB with almost no degradation of BER performance.

    DOI: 10.1109/ISTMWC.2007.4299176

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  • A Transmit Beamforming Method with Sensor Collaboration for Wireless Ubiquitous Network Systems

    Shigeru Tomisato, Satoshi Dennoa, Masaharu Hata

    Proc. CD of the 10th International Symposium on Microwave and Optical Technology, ISMOT 2007   2007

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  • Low peak OFDM signal transmission by using peak-reduction sub-carrier insertion

    NISHIZAKI Masaharu, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, HAGIWARA Junichiro

    IEICE technical report   106 ( 360 )   1 - 6   2006.11

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    In this paper, we proposed a new peak reduction method applicable to OFDMA systems, in which a user uses some frequency bands in all system bands, by using iterative peak reduction method for broadband wireless communications. The proposed method separates the system band into a information signal band and a peak-reduction signal band, and generates peak-reduction signals in the peak-reduction signal band by using iterative signal processing. Moreover, low level peak-reduction signals are generated in the information signal band to improve peak-reduction performance. The results by computer simulation show that proposed method can achieve the PAPR reduction of 3 to 4dB with almost no degradation of BER performance.

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  • B-5-71 Performance Evaluation of Out-of-Band Emission in OFDM Symbols with Time-Windowing

    MATSUDA Toshiyuki, FUJII Hiromasa, TOMISATO Shigeru, HATA Masaharu

    Proceedings of the Society Conference of IEICE   2006 ( 1 )   431 - 431   2006.9

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  • Transmission performance evaluation for designing an OFDM transmitter that offers iterative peak reduction

    Akiko Kubo, Shigeru Tomisato, Masaharu Hata, Hitoshi Yoshino

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E89A ( 7 )   1968 - 1971   2006.7

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    One of the key technologies to realize future broadband mobile communications is orthogonal frequency division multiplexing (OFDM) transmission. However, the peak-to-average power ratio (PAPR) in OFDM transmission is so much larger than that in single carrier transmission that its adoption in mobile communication systems is uncertain. This paper evaluates the transmission performance possible with iterative peak reduction to design more efficient OFDM transmitters. The PAPR reduction effect and bit error rate (BER) performance are clarified by computer simulations. We calculate the set PAPR value that achieves a target PAPR in the iterative peak reduction method. The required E-b/N-0 performance is evaluated under the calculated PAPR condition. The results are effective in designing the back-off value of a transmission power amplifier given fixed transmission quality and computational complexity.

    DOI: 10.1093/ietfec/e89-a.7.1968

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  • B-5-104 PAPR Performance of Iterative Peak Reduction with Roll-off Filtering for OFDM Transmission

    MATSUDA Toshiyuki, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa, YOSHINO Hitoshi

    Proceedings of the IEICE General Conference   2006 ( 1 )   457 - 457   2006.3

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  • PAPR Performance of Iterative Clipping and Filtering with a Roll-off Filter for OFDM Transmission

    Toshiyuki Matsuda, Shigeru Tomisato, Masaharu Hata, Hiromasa Fujii, Hitoshi Yoshino

    Proc. of the 3rd IEEE VTS Asia Pacific Wireless Communication Symposium, APWCS 2006   2006

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  • Transmission performance of OFDM signals with iterative peak reduction by using a non-linear power amplifier

    Shigeru Tomisato, Masaharu Hata

    International Journal of Microwave and Optical Technology, IJMOT   2006

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  • Highly efficient OFDM transmission by using adaptive peak-reduction signal processing

    Shigeru Tomisato, Akiko Kubo, Hiromasa Fujii, Masaharu Hata

    Proc. CD of the 15th IST Mobile & Wireless Communications Summit, IST Summit 2006   2006

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  • Cellular CDMA System Capacity in a Service Area with Tapered Traffic Distribution

    Masaharu Hata, Narihiro Shiraishi, Shigeru Tomisato

    2006 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC 2006), VOLS 1-4   25 - 29   2006

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    In the radio link design of cellular CDMA system, system capacity has been estimated with the uniform traffic distribution condition so far. In many cases, however, actual traffic in a service area is not distributed uniformly. Therefore, this paper discusses the up link capacity of the cellular CDMA system applied in a service area with tapered traffic distribution condition. The analytical result shows that the system capacity is degraded according to the degree of traffic concentration to the service area center. It is also suggested that the cell size change in inverse to the degree of traffic concentration is effective to mitigate the system capacity degradation.

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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-5-56 Low Peak OFDM Transmission with Peak-Reduction Sub-Carrier Insertion

    NISHIZAKI Masaharu, TOMISATO Shigeru, HATA Masaharu, FUJII Hiromasa

    Proceedings of the Society Conference of IEICE   416 - 416   2006

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  • B-5-130 Study of Adjacent Channel Interference between UHF-TV and Cellular Systems

    Inoue Masatomo, Tomisato Shigeru, Hata Masaharu

    Proceedings of the Society Conference of IEICE   2005 ( 1 )   530 - 530   2005.9

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  • B-5-102 Capacity of Cellular CDMA System under Tapered Traffic Distribution Condition

    Shiraishi Narihiro, Tomisato Shigeru, Hata Masaharu

    Proceedings of the Society Conference of IEICE   2005 ( 1 )   502 - 502   2005.9

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  • Peak power reduction method using adaptive peak reduction signal level control for OFDM transmission systems

    S Tomisato, M Hata

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E88A ( 7 )   1897 - 1902   2005.7

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    Future broadband mobile communication systems are necessary to achieve the bit rates of 100 Mbit/s. Orthogonal Frequency Division Multiplexing (OFDM) transmission is an attractive technology because it can remove the influence of frequency selective fading in broadband transmission by adding a suitable guard interval to each OFDM symbol. However, peak-to-average power ratio (PAPR) is very large in OFDM transmission. In this paper, we propose a new PAPR reduction method which can be applied even when unusable bands are inside the system band. In the proposed method, peak reduction signals are generated by iterative signal processing only in the usable frequency band, and filtering to remove out-of-band components of the peak reduction signals is incorporated into the iterative signal processing. The results of computer simulation show that the proposed method can effectively reduce peak power without expanding the spectrum both outside the system band and into unusable bands inside the system band. By using the proposed method, the broadband mobile communication system with low peak power and high flexibility of frequency band use can be realized.

    DOI: 10.1093/ietfec/e88-a.7.1897

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  • Performance enhancement of SC/S-MMSE turbo receiver for MIMO-SDM/OFDM transmission Reviewed

    Tetsushi Abe, Hiromasa Fujii, Hirohito Suda, Shigeru Tomisato

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 5 )   2110 - 2119   2005.5

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    This paper aims to improve the performance of the soft canceller followed by simplified minimum mean-square error (SC/SMMSE) turbo receiver [11] for multiple-input and multiple-output space-division multiplexing/orthogonal frequency division multiplexing (MIMO-SDM/OFDM) transmission; it performs iterative parallel soft interference cancellation and MMSE filtering, and stream-wise soft-input and soft-output decoding. For this aim, we newly introduce two detection techniques: 1) serial interference cancellation, and 2) cyclic redundancy check (CRC)-assisted interference cancellation and MMSE filter tap computation. Various computer simulations are conducted to evaluate the performance enhancement obtained via the use of the two detection techniques. The computer simulation results show that this paper's proposed serial SC/SMMSE turbo receiver with CRC achieves frame error rate (FER) performance gain over existing MIMO receivers (MMSE receiver, V-BLAST receiver, parallel SC/MMSE-matched filter (MF) turbo receiver, and parallel SC/S-MMSE turbo receiver) for QPSK, 16QAM and 64QAM modulation while keeping the comparable complexity order.

    DOI: 10.1093/ietcom/e88-b.5.2110

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  • B-5-51 Transmission Performance of Low Peak OFDM Signals with Iterative Signal Processing

    Kubo Akiko, Ueda Hiroki, Tomisato Shigeru, Hata Masaharu

    Proceedings of the IEICE General Conference   2005 ( 1 )   500 - 500   2005.3

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  • Transmission performance of highly efficient OFDM signals with iterative peak reduction

    Akiko Kubo, Shigeru Tomisato, Masaharu Hata

    Proc. of the 2nd IEEE VTS Asia Pacific Wireless Communication Symposium, APWCS 2005   2005

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  • Transmission performance of OFDM signals with iterative peak reduction by using a non-linear power amplifier

    Shigeru Tomisato, Masaharu Hata

    Proc. CD of the 10th International Symposium on Microwave and Optical Technology, ISMOT 2005(招待講演)   2005

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  • Capacity degradation due to external interference in mobile communication systems

    Masaharu Hata, Shigeru Tomisato

    Proc. CD of the 14th IST Mobile & Wireless Communications Summit, IST Summit 2005   2005

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  • B-5-79 Transmission Performance of OFDM Signals with Adaptive Peak Reduction Signals Processing

    Kubo Akiko, Tomisato Shigeru, Hata Masaharu

    Proceedings of the Society Conference of IEICE   479 - 479   2005

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  • PAPR Reduction Method Using Adaptive Peak Reduction Signal Control for OFDM Transmission Systems

    Shigeru Tomisato, Masaharu Hata

    Proc. of the Wireless Personal and Mobile Communication, WPMC 2004   2004

  • A study on integration of mobile communication and TV broadcasting systems operating in UHF band

    M Hata, S Tomisato

    TENCON 2004 - 2004 IEEE REGION 10 CONFERENCE, VOLS A-D, PROCEEDINGS   B549 - B552   2004

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    According to the recent introduction of digital-TV broadcasting services and the band expansion for mobile communication services, new systems by the integration of mobile communication and terrestrial TV broadcasting systems in the UHF band are expected to realize efficient resource management and new attractive services. In this paper, the aspects on system configuration and mobile radio link design are examined to investigate the possibility of integration of mobile communication and TV broadcasting systems operating in the UHF band.

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  • Efficient Spectrum Utilization by Time Division Beam Control Scheme in Cellular Systems

    Masaharu Hata, Shigeru Tomisato, Hitoshi Yoshino

    Proc. of the Mobile Venue '04 - Radio Network Management '04 (RNM '04)   2004

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  • PAPR Reduction Method Using Iterative Processing for OFDM Transmission Systems

    Shigeru Tomisato, Hirohito Suda, Masaharu Hata

    Proc. of the 1st IEEE VTS Asia Pacific Wireless Communication Symposium, APWCS 2004   2004

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  • Turbo receiver with SC/ Simplified-MMSE (S-MMSE) type equalizer for MIMO channel signal transmission

    FUJII Hiromasa, TOMISATO Shigeru, SUDA Hirohito

    Technical report of IEICE. RCS   103 ( 204 )   19 - 24   2003.7

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    MIMO channel transmission with turbo equalization is one of promising techniques to perform large capacity with limited bandwidth. Combinations of soft canceler and liner filter are proposed for the equalization parts, and matched filter(MF) or MMSE filter are used for the liner filter. The MF, however, does not have effects of intentional interference cancellation, thus causes FER performance degradation. On the other hand, the strict MMSE filtering needs symbol-by-symbol calculation of tap coefficients because of different degree of residual interference at each symbols. In this paper, we propose novel turbo equalization method for MIMO channel signal transmission. The proposed method utilized MMSE criterion to make tap coefficients based on the degrees of residual interference over a frame. The resultant tap coefficients are applied to all symbols on the frame. The proposed method achieves lower FER than those with MF, because our method also care for interference cancellation besides desired signal combining. Furthermore our method does not require much increase of computational complexity like symbol-by-symbol MMSE filter, as it applies common tap coefficient to all symbols over a frame. We show the effectiveness by link-level and system-level computer simulations and by complexity comparisons.

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  • A peak reduction scheme based on Control Signal Insertion for multi-carrier mobile communication systems

    S Tomisato, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E86B ( 6 )   1910 - 1916   2003.6

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    This paper proposes a new signal peak power reduction technique, Peak Reduction based on Control Signal lnsertion (PRCSI), for broadband mobile communications based on multi-channel signaling schemes. PRCSI reduces the peak power with a peak control signal that is generated symbol-by-symbol; no signal band expansion is incurred because the peak control signal is inserted into. the transmission signal band. PRCSI can achieve 4dB peak power reduction for 8-carrier signaling, while the E-b/N-0 value required to achieve 10(-3) average BER is I dB larger with PRCSI than without it. This BER performance degradation can effectively be compensated by the proper use of Trellis coding. The proposed technique is applied to OFDM transmission systems with large carrier number. The proposed technique can achieve 3-dB peak power ratio for 128-carrier OFDM signals with less than 1-dB performance degradation at the BER of 10(-3).

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  • A MIMO turbo equalizer for frequency-selective channels with unknown interference

    T Abe, S Tomisato, T Matsumoto

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   52 ( 3 )   476 - 482   2003.5

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    A new space-time turbo equalization algorithm is derived for frequency-selective multiple-input-multiple-output (MIMO) channels with unknown interference. The algorithm is an extension of our proposed MIMO equalization algorithm [12], which performs joint channel estimation, multiple user's signal detection, and decoding, all in an iterative manner. This paper's proposed algorithm uses estimates of the correlation matrix of composite unknown interference-plus noise components to suppress the unknown interference while effectively separating multiple users' signals to be detected (referred to as "known user'' later). The correlation matrix of the composite unknown interference-plus-noise, components can be estimated by time averaging the instantaneous emperical correlation matrix over the training period. Since the iterative channel estimation Yields better channel estimates as more iterations are performed, thereby the estimate of the correlation matrix of the unknown interference-plus-noise components also becomes more accurate. This results in better, signal detection performances, even in the presence of unknown interferers. A series of computer simulations show that this paper's proposed algorithm can properly separate known users' signals while suppressing unknown interference.

    DOI: 10.1109/TVT.2003.811615

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  • A novel SC/MMSE MIMO equalizer applying common tap coefficients over a frame

    Fujii Hiromasa, Tomisato Shigeru, Suda Hirohito

    Proceedings of the IEICE General Conference   2003 ( 1 )   "S - 45"-"S-46"   2003.3

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  • A Serial SC/S-MMSE Turbo Receiver for MIMO-SDM/OFDM Transmission in High Data Rate Mobile Communications

    Tetsushi Abe, Hiromasa Fujii, Shigeru Tomisato, Hirohito Suda

    Proc. of the 6th International Symposium on Wireless Personal Multimedia Communications, WPMC 2003   2003

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  • Turbo receiver with SC/Simplified-MMSE (S-MMSE) type equalizer for MIMO channel signal transmission

    H Fujii, S Tomisato, S Hirohito

    2003 IEEE 58TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS1-5, PROCEEDINGS   632 - 636   2003

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    This paper proposes a novel turbo equalization method, called SC/Simplified-MMSE (S-MMSE), for multiple-input multiple-output (MIMO) channel signal transmission. Our method, which deals with residual inter sub stream interference as their average over a frame, achieves excellent error performance at small computational cost. We evaluate our method by link-level and system-level simulations. A complexity comparison is also presented.

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  • Recent technologies for MIMO channel signal transmission in future broadband mobile communication systems

    S Tomisato, M Hata

    MICROWAVE AND OPTICAL TECHNOLOGY 2003   5445   26 - 31   2003

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    MIMO channel signal transmission is one of the key technologies to realize broadband mobile communication systems with the bit rate of up to 100 Mbit/s. Space Division Multiplexing (SDM) with multiple antennas in MIMO channel transmission is a promising technology to achieve a high capacity system with very high peak throughput. In this paper, we describe the receiver constructions for MIMO-SDM systems with iterative signal processing. We also introduce the recent research activities of dual polarized antennas for MIMO-SDM channel signal transmission, required microwave propagation characteristics, and so on.

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  • Spectrum Efficiency of Cellular System using Time Division Beam Control Scheme

    Masaharu Hata, Hitoshi Yoshino, Shigeru Tomisato, Toru Otsu

    Proc. of the 12th IST Summit on Mobile & Wireless Communications, IST Summit 2003   2003

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  • A complex baseband platform for spatial-temporal mobile radio channel simulations

    S Tsukamoto, T Sasoh, T Sakaki, T Okamura, S Tomisato, T Asai, T Matsumoto

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   51 ( 5 )   989 - 997   2002.9

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    Recently, joint spatial-temporal signal processing has been recognized as the key to reducing the effects of the intersymbol and cochannel interference seen in very high bit-rate mobile radio communications systems. Developing hardware simulators that can simulate mobile radio propagation scenarios in time and space domains is essential for evaluating the real-time performance of spatial-temporal signal processing schemes. This paper outlines a complex baseband platform developed for spatial-temporal mobile radio channel simulations. The platform consists of a complex baseband fading/array response simulator, a digital signal processor (DSP) board, and a general-purpose parameter estimator that uses systolic array implementation of the recursive least square (RLS) algorithm. Results of experiments conducted using the developed platform are presented to confirm the proper operation of the system.

    DOI: 10.1109/TVT.2002.801772

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  • Studies on Tap Coefficients for a Cascaded Connect Space-Time Equalizer

    TANABE Yasuhiko, OHGANE Takeo, NISHIMURA Toshihiko, OGAWA Yasutaka, ASAI Takahiro, TOMISATO Shigeru

    Technical report of IEICE. RCS   101 ( 683 )   23 - 30   2002.2

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    In this paper, we discuss a cascaded connection of an adaptive array antenna, in which each antenna contains a feedforward filter, and the Viterbi equalizer. When using the feedforward filter, MMSE tap coefficients degrade the system performance because noise correlation in an array output becomes high. Computer simulations show that proposed methods have better BER performance under a large delay spread condition and when the feedforward filters have few taps. In addition, we propose a method applying a multi-input Viterbi algorithm with a multi-beam adaptive array antenna. As a result, the proposed method improves BER performance significantly.

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  • An Appropriate Index to Evaluate Signal Separation Performances of Turbo Receivers in Correlated Frequency Selective MIMO Channels

    ABE Tetsushi, FUJII Hiromasa, TOMISATO Shigeru

    Technical report of IEICE. RCS   101 ( 683 )   37 - 44   2002.2

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    Signal separation performances of receivers for MIMO channel signal transmission degrades due to correlation of the channel. This paper proposes an index to evaluate the performances of MIMO Turbo receivers which has MMSE filtering process. We define Space-Time Correlation in frequency selective MIMO Channels, and use the norm and phase component of the correlation value as the index for signal separation performance of a receiver. Simulation results show that FER performance of a receiver degrades with the index closer to I, showing the reliability of the proposed index.

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  • Performance Evaluations of a Matched Filter Approximation for SC/MMSE Iterative Equalizer in the Wide Spread Intersymbol Interference

    OMORI Hiroo, ASAI Takahiro, MATSUMOTO Tadashi, TOMISATO Shigeru, KONDO Andrew

    Technical report of IEICE. RCS   101 ( 543 )   37 - 44   2002.1

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    For broadband mobile communications, an indispensable effort should be to cope with severe Intersymbol Interference (ISI). We have proposed an iterative ISI equalization algorithm, Soft Canceller followed by MMSE filter (SC/MMSE) with a matched filter approximation, that offers low computational complexity without causing any serious performance degradation from that of the optimal receiver. In this paper, it is shown that the proposed SC/MMSE algorithm can further reduce computational complexity by adaptively selecting path components depending on their strengths. Computer simulation results show that the proposed SC/MMSE algorithm does not cause any serious performance degradation by neglecting the paths components having relatively low strengths.

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  • A hybrid MIMO system using spatial correlation

    T Abe, H Fujii, S Tomisato

    5TH INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS, VOLS 1-3, PROCEEDINGS   1346 - 1350   2002

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    Fading correlation is an obstacle that degrades the potential capacity of Multiple Input and Multiple Output (MIMO) channels. This paper proposes a hybrid MIMO system that mitigates the throughput loss in highly correlated propagation channels. In the proposed system, the transmitter uses the spatial multiplexing scheme or the selection transmit diversity scheme according to information fed back from the receiver. The receiver determines which of the two transmission schemes provides higher throughput from the metrics of the spatial correlation and Signal to Noise Ratio (SNR) of the channel. We define the spatial correlation for MIMO channels, and by computer simulations obtain throughput loss as a function of spatial correlation for the spatial multiplexing scheme. The obtained data is used for transmission scheme selection. Since the feedback information contains only commands of the selected transmission scheme and symbol constellation size, bandwidth loss due to the feed back is acceptable. Simulation results show that by using spatial correlation the proposed system can switch from the spatial multiplexing scheme to the transmit diversity scheme in highly correlated propagation environments, and so mitigate the severe throughput loss which occurs in conventional non hybrid spatial multiplexing MIMO systems.

    DOI: 10.1109/WPMC.2002.1088399

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  • Radio Signal Processing for Mobile MIMO Signal Transmission

    TOMISATO Shigeru, MATSUMOTO Tadashi, ASAI Takahiro

    Technical report of IEICE. RCS   101 ( 370 )   43 - 48   2001.10

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    MIMO communication systems have been recognized as being able to achieve high speed signal transmission and system capacity. In this paper, technical subjects on radio signal processing in this MIMO channel signal transmission are briefly summarized. Configuration and performances of our proposed SC/MMSE space-time MIMO turbo equalizer, which can satisfy the requirements defined in the technical subjects, are described. Results of computer simulations show that SC/MMSE space-time MIMO turbo equalizer can drastically reduce computational complexity required for the MIMO signal separation while keeping performance almost equivalent to the optimal receiver.

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  • Link-Level Performance Evaluatins Using Multi-Dimensional Channel Sounding Field Measurement Data for Broadband Mobile Radio Communications

    TOMISATO Shigeru, YAMADA Takefumi, MATSUMOTO Tadashi

    Proceedings of the Society Conference of IEICE   2001 ( 1 )   444 - 444   2001.8

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  • Performance Evaluations of Separated Space-Time Equalizers Using Field Measurement Date

    Yamada Takefumi, Tomisato Shigeru, Matsumoto Tadashi

    Proceedings of the Society Conference of IEICE   2001 ( 1 )   439 - 439   2001.8

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  • Field test results for a beam and null simultaneous steering S/T-Equalizer in broadband mobile communication environments

    T Asai, S Tomisato, T Matsumoto

    IEICE TRANSACTIONS ON COMMUNICATIONS   E84B ( 7 )   1760 - 1767   2001.7

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    This paper proposes a beam and null simultaneous steering Space-Time Equalizer (S/T-Equalizer). The proposed S/T-Equalizer performs separated S/T-signal processing in order to reduce computational complexity to a practical level. For spatial signal processing, a new Adaptive Array Antenna algorithm is used that combines the beam and null steering concepts. For temporal signal processing, a conventional delayed decision feedback sequence estimation equalizer may be used. The proposed S/T-Equalizer was prototyped, and a series of field tests was conducted using a 5 GHz frequency band to evaluate transmission performances of the proposed system. Results show that the proposed S/T-Equalizer can reduce inter-symbol interference effects while maintaining reasonable signal strength, thereby improving BER performance.

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  • Performance evaluation of FTDL-spatial/MLSE-temporal equalizers in the presence of co-channel interference - Link-level simulation results using field measurement data

    T Yamada, S Tomisato, T Matsumoto, U Trautwein

    IEICE TRANSACTIONS ON COMMUNICATIONS   E84B ( 7 )   1961 - 1964   2001.7

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    Providing results of a series of link-level simulations for a class of spatial and temporal equalizer (S/T-equalizer) is the primary objective of this letter, which is supplemental to this letter`s companion article. The S/T-equalizers discussed in this letter have a configuration that can be expressed as the cascaded connection of adaptive array antenna and maximum likelihood sequence estimator (MLSE): each of the adaptive ar ray antenna elements has a fractionally spaced tapped delay line (FTDL), and the MLSE has taps covering a portion of the channel delay profile. Both the desired and interference signals suffer from severe inter-symbol interference (ISI). A major difference of this article from its companion letter is that account is taken of the presence of co-channel interference (CCI). Bit error rate (BER) performance of the S/T-equalizer is presented as a result of the link-level simulations that use field measurement data.

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  • Results of link-level simulations using field measurement data for an FTDL-spatial/MLSE-temporal equalizer

    T Yamada, S Tomisato, T Matsumoto, U Trautwein

    IEICE TRANSACTIONS ON COMMUNICATIONS   E84B ( 7 )   1956 - 1960   2001.7

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    This letter shows the results of a series of link level simulations conducted to evaluate the performances of spatial and temporal equalizers (S/T-equalizers) using field measurement data. The configuration of the spatial and temporal equalizer discussed in this letter can be expressed as a cascade of an adaptive array antenna and maximum likelihood sequence estimator (MLSE): each of the adaptive array antenna elements has a fractionally spaced tapped delay line (FTDL), and the MLSE has taps covering a portion of channel delay profile. Bit error rate (BER) performances of the S/T-equalizers are presented, and performance sensitivity to symbol timing offset is investigated.

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  • System-Level Simulations for Space-Time Equalizer Performance Evaluations Using Field Measurement Data

    YAMADA Takefumi, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   101 ( 91 )   25 - 30   2001.5

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    Combined effects of Co-channel Interference (CCI) and Inier-Symbol Interference (ISI) are chief handles to overcome for broadband multimedia mobile communications. Recently, joint spatial and temporal equalization (S/T-equalization) techniques have been recognized as technological basis that can solve these problems. To demonstrate effectiveness of S/T-equalizers in realistic mobile propagation environments, authors have conducted link-level simulations using multi-dimensional channel sounding field measurement data. This paper presents results of system-level simulations that takes into account the presence of multiple interferences, assuming a sectored cell layout. It is shown that without using neither spreading nor coding 7×10^<-3> BER can be achieved at more than 99% of the areas, even though all users use the same time- and frequency- slots in the cell layout considered.

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  • Optimal Design of S/T-equalizers Using Field Measurement Data

    Yamada Takefumi, Tomisato Shigeru, Matsumoto Tadashi

    Proceedings of the IEICE General Conference   2001 ( 1 )   555 - 555   2001.3

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  • Transmission Performances of Separated Spatial and Temporal Equalizer in Broadband Mobile Radio Communications

    TOMISATO Shigeru, TAKASHIMA Kazumasa, MATSUMOTO Tadashi

    Proceedings of the IEICE General Conference   2001 ( 1 )   554 - 554   2001.3

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  • 実伝搬データを用いた時空等化器性能評価

    山田 武史, 冨里 繁, 松本 正

    ドコモテクニカルジャーナル   Vol.9, No.3, pp.86-91   2001

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  • Performance Evaluation of a Space-Time Turbo Equalizer in Frequency Selective MIMO Channels Using Field Measurement Data

    Tetsushi Abe, Shigeru Tomisato, Tadashi Matsumoto

    IEE MIMO Communications Systems from Concept to Implementations   2001

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  • FPGAを用いて実現した干渉キャンセラTCCのリアルタイム室内伝送実験

    村田 英一, 塚本 悟司, 冨里 繁, 松本 正, 吉田 進

    電子情報通信学会論文誌, B   2001

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  • Performance evaluation for FTDL-Spatial/MLSE-Temporal Equalizer using field measurement data

    T Yamada, T Matsumoto, S Tomisato, U Trautwein

    2001 IEEE THIRD WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, PROCEEDINGS   106 - 109   2001

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    This paper shows results of link level simulations conducted to evaluate performances of spatial and temporal equalizers (S/T-Equalizers) using field measurement data. The spatial and temporal equalizer discussed in this paper have a configuration expressed as a cascaded connection of adaptive array antenna and maximum likelihood sequence estimator (MLSE): each of the antenna elements has a fractionally spaced tapped delay line (FTDL), and the MLSE has taps covering a portion of channel delay profile. Bit error rate (BER) performances of the S/T-Equalizers, including the in the presence of Co-channel Interference (CCI) are presented. Performance sensitivity to symbol timing offset is also investigated. Major conclusions of this paper are that allocating more taps to spatial domain is more effective than to time domain when the total number of taps is fixed, and that increasing the FTDL length is effective in reducing performance sensitivity to timing offset.

    DOI: 10.1109/SPAWC.2001.923856

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  • A joint Spatial and Temporal Equalizer using separated spatial and temporal signal processing for broadband mobile radio communications

    S Tomisato, T Matsumoto

    2001 IEEE THIRD WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, PROCEEDINGS   298 - 301   2001

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    Joint spatial and temporal equalization techniques are considered most effective in reducing effects of Go-channel Interference (CCI) and Inter-Symbol Interference (ISI) in broadband mobile communications. This paper proposes a new configuration of Spatial and Temporal Equalizer (S/T-Equalizer) using separated spatial and temporal signal processing., An iterative parameter estimation technique is also proposed for the S/T-Equalizer. Computer simulations were conducted to demonstrate effectiveness of the proposed S/T-Equalizer. Results of computer simulations show that the proposed S/T-Equalizer can achieve excellent performances in the presence of CCI and ISI.

    DOI: 10.1109/SPAWC.2001.923908

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  • System Performance Evaluations Using Field Measurement Data for Spatial and Temporal Equalizer

    YAMADA Takefumi, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   100 ( 345 )   95 - 100   2000.10

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    Combined effects of Co-channel Interference(CCI) and Inter-Symbol Interference(ISI) are chief handles to overcome for Broadband multimedia mobile communications. Recently, joint spatial and temporal equalization (S/T-equalization) techniques have been recognized as technological basis that can solve these problems. To demonstrate effectiveness of S/T-equalizer, performances have to be evaluated in realistic mobile propagation environments. This paper presents results of link-level simulations conducted to evaluate distributions of Signal to Interference plus Noise power ratio (SINR), achieves by various S/T-Equalizer configurations, in a field measurement data considered with an actual cell configuration.

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  • Performance Evaluation of Spatial-Temporal Equalizers Using Field Measurement Data in Broadband Mobile Communications

    Yamada Takefumi, Tomisato Shigeru, Matsumoto Tadashi

    Proceedings of the Society Conference of IEICE   2000 ( 1 )   348 - 348   2000.9

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  • Transmission Performance Improvements of a Spatial and Temporal Equalizer Using Iteraive Parameter Estimation with Separated S/T-Signal Processing

    TOMISATO Shigeru, MATSUMOTO Tadashi

    Proceedings of the Society Conference of IEICE   2000 ( 1 )   347 - 347   2000.9

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  • Performance Evaluations Using Field Measurement Data for Spatial and Temporal Equalization Techniques

    YAMADA Takefumi, TRAUTWEIN Uwe, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   100 ( 194 )   43 - 48   2000.7

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    Broadband signal transmission over mobile radio channels is required, which imposes plobrems due mainly to Co-channel Interference(CCI)and Inter-Symbol Interference(ISI). Recently, joint spatial and temporal equalization(S/T-equalization)techniques have been recognized as technological basis that can solve these problems. To demonstrate effectiveness of S/T-equalizer, performances have to be evaluated in realistic mobile propagation environments. This paper investigates different types of S/T-equalizer configurations and their performances through link-level simulations using field measurement data.

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  • Transmission Performance of Beam and Null Simultaneous Steering S/T-Equalizer

    MIKI Nobuhiko, ASAI Takahiro, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   100 ( 82 )   7 - 12   2000.5

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    In broadband mobile communications, Co-Channel Interference(CCI), Inter-Symbol Interference(ISI), and relatively large propagation loss have to be overcome. Joint Space-Time-Equalization(S/T-Equalization) is considered most effective in solving these problems. This paper proposes a new S/T-Equalization technique that performs separated S/T-signal processing with acceptable levels of complexity. The algorithm used in an Adaptive Array Antenna combines the beam and null steering concepts; a sharp beam is steered towards the desired signal while nulls are steered towards interferers. For temporal equalization, a conventional DDFSE-type equalizer is used. The proposed S/T-Equalizer was prototyped, and field tests were conducted in the 5GHz frequency band. The results confirm that the proposed S/T-Equalizer can reduce ISI effects while maintaining reasonable signal strength, thereby improving BER performance. This paper outlines the field tests and its results.

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  • Signal Transmission Performances of a Joint Spatial and Temporal Equalizer using Separated Spatial and Temporal Signal Processing for Mobile Radio Communications

    TOMISATO Shigeru, MIKI Nobuhiko, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   100 ( 21 )   7 - 12   2000.4

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    In mobile multimedia communications, Co-channel Interference(CCI) and Inter-Symbol Interference(ISI) are major problems to overcome. Joint spatial and temporal equalization technique is considered most effective in solving the problem. This paper proposes a new configuration of spatial and temporal equalizer(S/T equalizer)using separated spatial and temporal signal processing for mobile radio communications. Computer simulations were conducted to evaluate performances of the proposed S/T equalizer. Results of computer simulations show that the proposed S/T equalizer can achieve excellent CCI and ISI canceling performance.

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  • Coverage Enhancement with a Beam and Null Simultaneous Steering S/T-Equalizer

    MIKI Nobuhiko, TOMISATO Shigeru, MATSUMOTO Tadashi

    Proceedings of the IEICE General Conference   2000 ( 1 )   542 - 542   2000.3

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  • Signal Transmission Performances of a Spatial and Temporal Equalizer using Separated Spatial and Temporal Signal Processing

    TOMISATO Shigeru, MIKI Nobuhiko, MATSUMOTO Tadashi

    Proceedings of the IEICE General Conference   2000 ( 1 )   541 - 541   2000.3

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  • Coherent frequency hopping multiple access (CFHMA) with multiuser detection for mobile communication systems

    S Tomisato, K Fukawa, H Suzuki

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   49 ( 2 )   531 - 539   2000.3

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    This paper proposes a new multiple-access (MA) scheme, coherent frequency hopping MA (CFHMA) with multiuser detection, which effectively obtains the diversity effect for realizing spectrally efficient mobile communications. CFHMA is fundamentally equivalent to a coherent fast frequency hopping frequency-division MA (FDMA) that incorporates low spreading factor direct-sequence (DS) code-division IMA (CDMA). Multiple users occupy the same frequency band, and they are simultaneously detected by multiuser detection. There are several implementations of CFHMA. Two major techniques are introduced: coherent hybrid DS fast FH (FFH) (CHYB-DS-FFH) and interleaved FH (IFH), This paper focuses on IFH and discusses its principle of operation, transmission system configuration, and performance aspects. The results suggest the feasibility of a spectrally efficient mobile radio system.

    DOI: 10.1109/25.832984

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  • ビーム/ヌル同時ステアリング方式を用いた時空等化器

    冨里 繁, 三木 信彦, 浅井 孝浩, 松本 正

    ドコモテクニカルジャーナル   Vol.8, No.3, pp.48-55   2000

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  • Field test results for beam and null simultaneous steering S/T-Equalizer in broadband mobile communication environment

    N Miki, T Asai, S Tomisato, T Matsumoto

    IEEE VEHICULAR TECHNOLOGY CONFERENCE, FALL 2000, VOLS 1-6, PROCEEDINGS   1663 - 1668   2000

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    This paper proposes a beam and null simultaneous steering Space-Time Equalizer (S/T-Equalizer). The proposed S/T-Equalizer performs separated S/T-signal processing in order to reduce computational complexity to a practical level. For spatial signal processing, a new Adaptive Array Antenna algorithm is used that combines the beam and null steering concepts. For temporal signal processing, a conventional delayed decision feedback sequence estimation equalizer may be used. The proposed S/T-Equalizer was prototyped. A series of field tests war then conducted using the 5GHz frequency band to evaluate transmission performance of the proposed system The results show that the proposed S/T-Equalizer can reduce inter-symbol interference effects while maintaining reasonable signal strength, improving BER performance.

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  • Performances of an Adaptive Equalizer with Metric Combining Space- and Time-Diversity for Broadband Communications

    MIKI Nobuhiko, KAWASHIMA Makoto, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   99 ( 357 )   115 - 120   1999.10

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    In broadband mobile communications, inter-symbol interference is one of the major problems to overcome. Adaptive equalizers have been considered effective in solving the problem. This paper proposes an adaptive equalizer utilizing the concepts of metric combining space and time-diversity. The proposed equalizer was prototyped for a real time operation at a transmission bitrate of 24Mbps. The prototyped equalizer has 2-branch space and 2-branch time-diversity capabilities, thereby 4-branch diversity in total. Experimental results show that the prototyped equalizer achieves almost the same performances as obtained through computer simulations.

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  • Coverage Prediction Using a Ray-tracing Technique for an Adaptive Array Antenna System

    MIKI Nobuhiko, TOMISATO Shigeru, MATSUMOTO Tadashi

    Proceedings of the Society Conference of IEICE   1999 ( 1 )   273 - 273   1999.8

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  • Coverage Prediction for an Adaptive Array Antenna System Using a Ray-Tracing Technique

    MIKI Nobuhiko, TOMISATO Shigeru, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   99 ( 220 )   43 - 48   1999.7

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    In broadband mobile communications, co-channel interference and inter-symbol interference as well as relatively large propagation loss are the major problems to overcome. Adaptive Array Antennas have been considered effective in solving these problems. Previously, the concepts of beam steering and null steering have been developed as different technology bases for adaptive array antennas. This paper aims to combine beam and null steering concepts : main beam is steered toward the desired signal components while nulls being steered toward interference components. This paper also creates a new channel modeling scheme using ray-tracing to enhance the accuracy of system performance evaluations. Coverage achieved by the proposed antenna system is estimated by using the created channel modeling scheme. Results of a series of computer simulations show that the proposed antenna system can improve SIR performance over a omni antenna system by about 30dB at 95% coverage in a sub-urban area.

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  • B-5-42 SIR Performances of a Spatial and Temporal Pre-Equalization Technique in a TDD Mobile Communication System

    TOMISATO Shigeru, FUKAWA Kazuhiko, MATSUMOTO Tadashi

    Proceedings of the IEICE General Conference   1999 ( 1 )   393 - 393   1999.3

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  • B-5-94 Performances of an Adaptive Metric Combining Equalizer with Space-and Time-Diversity

    MIKI Nobuhiko, TOMISATO Shigeru, MATSUMOTO Tadashi

    Proceedings of the IEICE General Conference   1999 ( 1 )   445 - 445   1999.3

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  • B-5-93 Effects of Power Amplifier Nonlinear Distortion on Adaptive Equalization Performances

    Tomisato Shigeru, Takashima Kazumasa

    Proceedings of the IEICE General Conference   1999 ( 1 )   444 - 444   1999.3

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  • SIR Performance of Spatial and Temporal Equalization in TDD Mobile Communication Systems

    TOMISATO Shigeru, Fukawa Kazuhiko, Matsumoto Tadashi

    Proceedings of the Society Conference of IEICE   1998 ( 1 )   329 - 329   1998.9

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  • Signal Transmission Performance of Spatial and Temporal Pre-Coding in TDD Mobile Communication Systems

    TOMISATO Shigeru, Fukawa Kazuhiko, Matsumoto Tadashi

    Proceedings of the IEICE General Conference   1998 ( 1 )   540 - 540   1998.3

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  • Signal Transmission Performance of Temporal and Spatial Pre-Coding for TDD Multimedia Mobile Radio Communication Systems

    TOMISATO Shigeru, FUKAWA Kazuhiko, MATSUMOTO Tadashi

    Technical report of IEICE. RCS   97 ( 488 )   55 - 60   1998.1

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    This paper proposes a new spatial and temporal pre-coding scheme for TDD multimedia mobile communication systems. SIR and BER performances are demonstrated through computer simulations. It is shown that the proposed scheme is effective in reducing signal distortions due to inter-symbol interference (ISI) and co-channel interference (CCI) under delay- and interference-rich multipath fading environments.

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  • Coherent Hydrid DS-FFH CDMA with Adaptive Interference Cancelling for Cellular Mobile Communications

    IEICE Transactions on communications   E77-B ( 5 )   589 - 597   1998

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  • Coherent Hydrid DS-FFH CDMA with Adaptive Interference Cancelling for Cellular Mobile Communications

    IEICE Transactions on communications   E77-B ( 5 )   589 - 597   1998

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  • コーヒーレントハイブリットDS-FFH CDMA方式-移動無線における基本特性-

    電子情報通信学会論文誌、B   J77-B-Ⅱ ( 1 )   1 - 10   1998

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  • Time/Space Pre-coding and its Performances in TDD Mobile Communication Systems

    TOMISATO Shigeru, Fukawa Kazuhiko, Matsumoto Tadashi

    Proceedings of the Society Conference of IEICE   1997 ( 1 )   398 - 398   1997.8

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  • Performances of Adaptive Transmission Array in TDD Mobile Communication Systems

    TOMISATO Shigeru, Matsumoto Tadashi

    Proceedings of the IEICE General Conference   474 - 474   1997

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  • Multicarrier transmission system with low peak power for high bit-rate digital mobile radio communications

    TOMISATO Shigeru, SUZUKI Hiroshi

    Proceedings of the Society Conference of IEICE   1996 ( 1 )   549 - 550   1996.9

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  • A trellis-coded multi-code transmission system with low peak power for high-speed digital mobile radio communications

    TOMISATO Shigeru, SUZUKI Hiroshi

    Proceedings of the IEICE General Conference   1996 ( 1 )   435 - 435   1996.3

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  • 送信増幅における電力効率を改善した包絡線制御形ディジタル変調方式-移動通信用トレイス符号化8PSKへの応用

    電子情報通信学会論文誌、B   J75-B-Ⅱ ( 12 )   918 - 928   1996

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  • A Smooth Envelope Parallel Modulation / Demodulation Scheme

    TOMISATO Shigeru, SUZUKI Hiroshi

    Technical report of IEICE. RCS   95 ( 282 )   59 - 64   1995.9

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    Parallel modulation and demodulation schemes, such as multi-carrier transmission, are effective in high-speed digital mobile communications. This paper proposed a smooth envelope parallel modulation and demodulation scheme. The proposed scheme can be applied to two systems, a multi-carrier system and a multi-code system. The systems with 4 carriers and 4 codes achieve the peak suppression of 2 dB and 4 dB, respectively. Because the receivers of the systems employ the MLSE scheme, the BER performance is nearly equal to that of the systems without suppression.

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  • A peak suppressed multi-carrier modulation system

    TOMISATO Shigeru, SUZUKI Hiroshi

    Proceedings of the Society Conference of IEICE   1995 ( 1 )   294 - 294   1995.9

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  • QPSK移動無線通信における近似ナイキスト伝送の検討

    電子情報通信学会論文誌、B   J74-B-Ⅱ ( 7 )   405 - 412   1995

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  • A high-speed digital mobile radio communication system by using multitransmitter signal transmission

    TOMISATO Shigeru, SUZUKI Hiroshi

    Proceedings of the IEICE General Conference   386 - 386   1995

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  • Transmission Performance of CFHMA Cellular System

    Tomisato Shigeru, Fukawa Kazuhiko, Suzuki Hiroshi

    1994 ( 1 )   302 - 302   1994.9

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  • Coherent Hybrid DS-FFH CDMA - Basic Performance in Mobile Radio Environment -

    TOMISATO Shigeru, FUKAWA Kazuhiko, SUZUKI Hiroshi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   77 ( 1 )   1 - 10   1994.1

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  • A signal design without co-channel interference for approximately synchronized CDMA systems

    TOMISATO S, Fukawa Kazuhiko, Suzuki Hiroshi

    IEEE J. Sel. Areas Commun.   12 ( 5 )   837 - 841   1994

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    This paper proposes Coherent-HYBrid Direct-Sequence Fast-Frequency-Hopping (CHYB-DS-FFH) CDMA with Adaptive Interference Cancelling (AIC) for cellular mobile communications. The features of CHYB-DS-FFH are symbol-by-symbol frequency diversity and low chip-rate DS multiplexing; both of which are based on a coherent FFH modulation and demodulation scheme. The combination of coherent FFH, space diversity, and AIC is very effective for reducing the performance degradation due to interference. Computer simulations demonstrate BER performance of a 2 hop 500-kHz-interval frequency hopping system using (i) a linear canceller or (ii) a nonlinear canceller. Both systems employ the two branch space diversity reception of 10 kb/s QPSK with FFH over a 1 MHz system bandwidth. In quasi-static channels, the average BER performance is 10^&lt-2&gt with average E_b/N_o less than 8dB. In dynamic fading channels under full interference conditions, CHYB-DS-FFH with the linear adaptive interference canceller realizes a BER of 10^&lt-2&gt at the average E_b/N_o of 15 dB with maximum Doppler frequency f_D of 5 Hz, whereas CHYB-DS-FFH with the non-linear adaptive interference canceller achieves the same BER at the average E_b/N_o of 15 dB with f_D equal to 30 Hz.

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  • Code Freaquency Division Multiple Access(CFDMA)-Principle and Transmission Performance in Mobile Radio-

    Tomisato Shigeru, Fukawa Kazuhiko, Suzuki Hiroshi

    Technical report of IEICE. RCS   RCS93 - 52   1993

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    This paper proposes Code Frequency Division Multiple Access(CFDMA)generalized from Coherent Hybrid DS-FFH CDMA,and derives various types of transmission channels from CFDMA.Among CFDMA,Interleaved Frequency Hopping(IFH)is superior to the others in tracking the fading,and computer simulation verifies the performance.In fading channels,IFH of chip number K=2 achieves average BER of 10^-2> at 15 dB average E_b, N_O and 60 Hz maximum Doppler frequency f_D under full co-channel interference condition. IFH of K=4 achieves the BER at f_D=300 Hz under half co-channel interference condition.

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  • Coherent Hybrid DS-FFH CDMA with Non-Linear Adaptive Interference Canceller

    Tomisato Shigeru, Fukawa Kazuhiko, Suzuki Hiroshi

    Technical report of IEICE. SST   SST93 - 11   1993

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    This paper proposes Coherent-HYBrid Direct-Sequence Fast- Frequency-Hopping(CHYB-DS-FFH) CDMA with Non-Linear Adaptive Interference Canceller(NL-AIC)for mobile radio communications.BER performance in Rayleigh fading environments is calculated by computer simulations.In quasi-static channels,average E_b, N_0 for achieving BER=10^-2> of NL-AIC is better than that of a linear AIC by 8 dB under a co-channel interference condition.In dynamic fading channels,CHYB-DS-FFH with NL-AIC achieves average BER of 10^ -2> at average E_b/N_0 of 15 dB at maximum Doppler frequency of 30 Hz under a co-channel interference condition.

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  • Envelope Controlled Digital Modulation Improving Power Efficient of Transmitter Amplification - Application to Trellis- Coded 8PSK for Mobile Radio -

    TOMISATO Shigeru, SUZUKI Hiroshi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   75 ( 12 )   918 - 928   1992.12

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Presentations

  • 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 IEEE Hiroshima Student Symposium  2021.11.27 

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  • 地下・地上間無線通信における伝搬損失低減に関する一検討

    山本 修平, 木村 征司, 山口 晄一, 冨里 繁, 上原 一浩

    The 23rd IEEE Hiroshima Student Symposium  2021.11.27 

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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 IEEE Hiroshima Student Symposium  2021.11.27 

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  • 被干渉システムの使用帯域に応じたマルチバンド無線システム用帯域幅制御

    飯田 大嗣, 冨里 繁, 上原 一浩

    The 23rd IEEE Hiroshima Student Symposium  2021.11.27 

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  • 被干渉システムの使用帯域に応じたフィルタリングを用いるマルチバンドシステム用帯域幅制御手法の検討

    安田 翔悟, 冨里 繁, 上原 一浩

    The 23rd IEEE Hiroshima Student Symposium  2021.11.27 

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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 IEEE Hiroshima Student Symposium  2021.11.27 

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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 IEEE Hiroshima Student Symposium  2021.11.27 

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  • 水位計用アンテナ特性に対する水の影響に関する検討

    山口 晄一, 山本 修平, 冨里 繁, 上原 一浩

    2021年度年電気・情報関連学会中国支部連合大会  2021.10.23 

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    Event date: 2021.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • マルチバンドシステムにおける被干渉システムの使用帯域に応じた帯域幅制御による干渉低減効果

    飯田 大嗣, 冨里 繁, 上原 一浩

    2021年度年電気・情報関連学会中国支部連合大会  2021.10.23 

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  • 他システムの利用帯域に応じたフィルタリングを用いるマルチバンドシステム用帯域幅制御手法

    安田 翔悟, 冨里 繁, 上原 一浩

    2021年度年電気・情報関連学会中国支部連合大会  2021.10.23 

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  • 可視光通信用LEDの周波数特性及び非線形歪補償の検討

    得居 紀宏, 冨里 繁, 田野 哲, 上原 一浩

    2021年度年電気・情報関連学会中国支部連合大会  2021.10.23 

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  • LED可視光無線通信における適応送信分配を用いた空間的並列信号伝送の検討

    日笠 颯汰, 冨里 繁, 田野 哲, 上原 一浩

    2021年度年電気・情報関連学会中国支部連合大会  2021.10.23 

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  • 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

    2021年電子情報通信学会総合大会  2021.3.12 

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    Event date: 2021.3.9 - 2021.3.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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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

    2021年電子情報通信学会総合大会  2021.3.12 

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    Event date: 2021.3.9 - 2021.3.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Convolutional Neural Network Models for Automatic Modulation Classification using Constellation Diagrams

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, Kazuhiro Uehara

    2021.3.12 

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    Event date: 2021.3.9 - 2021.3.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 地下・地上間無線通信における基地局アンテナ高さと伝搬損失の関係の一検討

    山本 修平, 八幡, 一毅, 下田, 雄大, 冨里, 繁, 上原 一浩

    2021年電子情報通信学会総合大会  2021.3.10 

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    Event date: 2021.3.9 - 2021.3.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Window Function and Width of STFT in Collision Signal Separation and Demodulation Method Using Stored Batch Signal Processing

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

    2020.11.28 

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • A Bandwidth Control Method for Multi-Band Wireless Systems according to External System Interference and Inter-System Power Ratio

    Kanta Haino, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Dive into Convolutional Neural Network with Constellation Diagram for Automatic Modulation Classification

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • A Study on the Effect of Base Station Antenna Height in Wireless Communication between Underground and Aboveground

    Shuhei Yamamoto, Kazuki Yawata, Takahiro Shimoda, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Separation performance evaluation based on the influence of interference signal power by accumulated batch signal processing

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

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • A study on the effect of Eb/N0 on a separation and demodulation method of sensor terminal using stored batch signal processing

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

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Transmission Performance of Highly Efficient Modulation in LED Visible Light Communications by Collaborative Linearization in Both Transmitter and Receiver

    Zhengxin Liu, Keitaro Hirai, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Receivable Signal Stream Number of Spatially Parallel Transmission in LED Visible Light Wireless Communications

    Ryosuke Okamoto, Shigeru Tomisato, Satoshi Denno and Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Coverage Improvement by Bandwidth Control Corresponding to Channel Fluctuation in Spectrum Sharing Systems

    Wataru Okada, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Transmission Performance Improvement by LED Amplitude Deviation Compensation of Frequency Response

    Takeru Fukuyama, Shigeru Tomisato, Satoshi Denno, and Kazuhiro Uehara

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    Event date: 2020.11.28 - 2020.11.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Spatially Parallel Signal Transmission in LED Visible Light Wireless Communications

    Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2020.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Bandwidth Control Method Corresponding to Channel Fluctuation in Spectrum Sharing Systems

    Wataru Okada, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2020.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Compensation Method for LED Amplitude Deviation of Frequency Response in Visible Light Communications

    Takeru Fukuyama, Shigeru Tomisato, Satoshi Denno, and Kazuhiro Uehara

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    Event date: 2020.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • High-Speed Signal Transmission in LED Visible Light Wireless Communications by Spatial Parallel Transmission

    Ryosuke Okamoto, Shigeru Tomisato, Satoshi Denno and Kazuhiro Uehara

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    Event date: 2020.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Bandwidth Control Method for Multi-Band Systems according to Interference Power from External Systems

    Kanta Haino, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2020.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Window Width of STFT in Collision Signal Separation and Demodulation Method Using Stored Batch Signal Processing

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

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    Event date: 2020.9.15 - 2020.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Automatic Modulation Classification of Digital Modulation Signals using Convolutional Neural Network with Constellation Diagram

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2020.9.15 - 2020.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Inter-System Interference Reduction Effect by Adaptive Band Selection in Spectrum Sharing

    Naoto Takamatsu, Yoshiki Inuzuka, Shigeru Tomisato, Kazuhiro Uehara, Satoru Shimizu, Yoshinori Suzuki

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    Event date: 2020.3.17 - 2020.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Window Function of STFT in Collision Signal Separation and Demodulation Method Using Stored Batch Signal Processing

    Toru Nishiyama, Ryuku Miyachi, Humiya Ohno, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2020.3.17 - 2020.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Collaborative Linearization Method in Both Transmitter and Receiver for LED Visible Light Communications

    Keitaro Hirai, Shimpei Goto, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2020.3.17 - 2020.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • LED Visible Light Communications by Pre-Distortion and Non-Linear Distortion Noise Canceling

    Keitaro Hirai, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

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  • A study on Automatic Modulation Recognition using Convolutional Neural Network with Constellation Diagram

    Yutao Liu, Toru Nishiyama, Shigeru Tomisato, Kazuhiro Uehara

    The 21st IEEE Hiroshima Student Symposium  IEEE広島支部

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • A study on a new separation and demodulation method for collided signals using stored batch signal processing

    Toru Nishiyama, Ryuku Miyachi, Humiya Ohno, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

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  • Interference Power Reduction Effect According to the Number of Bandwidth Control Bands in Multi-Band IoT Systems

    Naoto Takamatsu, Shigeru Tomisato, Kazuhiro Uehara

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

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  • Transmission Performance of Spatially Parallel Transmission in LED Visible Light Wireless Communications by Non-Linear Distortion Compensation

    Saroma Era, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2019.11.30 - 2019.12.1

    Language:Japanese   Presentation type:Poster presentation  

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  • An Interference and Non-Linear Distortion Noise Canceler in LED Visible Light Indoor Wireless Communications

    Keitaro Hirai, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2019.11.5 - 2019.11.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Spatially Parallel Transmission by Collaborative Non-Linear Distortion Compensation in Both Transmitter and Receiver for LED Visible Light Communications

    Saroma Era, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara

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    Event date: 2019.11.5 - 2019.11.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Non-Linear Distortion Compensation Effect in LED Visible Light Wireless Communications with Spatial Multiplexing

    Saroma Era, Shigeru Tomisato, Satoshi Denno, and Kazuhiro Uehara

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    Event date: 2019.10.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Signal Separation and Demodulation Method for Multi-level Modulation Sensor Terminal Signal in Stored Batch Signal Processing

    Toru Nishiyama, Ryuku Miyachi, Humiya Ohno, Shigeru Tomisato, Satoshi Denno, and Kazuhiro Uehara

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    Event date: 2019.10.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Transmission Performance Evaluation by IoT Terminal Non-linearity with Multiple Bands

    Naoto Takamatsu, Shigeru Tomisato, and Kazuhiro Uehara

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    Event date: 2019.10.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An Iterative Non-Linear Distortion Noise Canceller for LED Visible Light Wireless Communications

    Keitaro Hirai, Shigeru Tomisato, Satoshi Denno, and Kazuhiro Uehara

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    Event date: 2019.10.26

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Receivable signal number evaluation in spatially parallel transmission for LED visible light wireless communications

    Multiple Innovative Kenkyu-kai Association for wireless communications 2019 

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    Event date: 2019.10.2 - 2019.10.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 蓄積一括信号処理における衝突した受信信号の分離・復調方法の一検討

    Multiple Innovative Kenkyu-kai Association for wireless communications 2019 

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    Event date: 2019.10.2 - 2019.10.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Interference Reduction by Bandwidth Control according to Reception Power Ratio of Spectrum Sharing Systems

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    Event date: 2019.9.10 - 2019.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A study on electromagnetic wave propagation modeling of underground structures.

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    Event date: 2019.9.10 - 2019.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A study of signal separation / demodulation method by accumulated batch signal processing

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    Event date: 2019.9.10 - 2019.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Inter-System Interference Control by Out-of-Band Noise Reduction in Spectrum Sharing Systems

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    Event date: 2019.3.19 - 2019.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Lighting Arrangement for Spatially Parallel Signal Transmission in LED Visible Light Communications

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    Event date: 2019.3.6 - 2019.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Interference Characteristic Evaluation in Spatial Multiplexing in LED Visible Light Wireless Communications

    2018 

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    Event date: 2018.11.17 - 2018.11.18

    Language:Japanese   Presentation type:Poster presentation  

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  • An Experimental and Computational Study of Radio Propagation Modeling for Underground Structure

    2018 

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    Event date: 2018.11.17 - 2018.11.18

    Language:Japanese   Presentation type:Poster presentation  

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  • Coverage Evaluation by Bandwidth Control in Spectral Sharing Multi-Band Systems

    2018 

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    Event date: 2018.11.17 - 2018.11.18

    Language:Japanese   Presentation type:Poster presentation  

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  • Interference Characteristic Evaluation in Spatial Multiplexing for LED Visible Light Communication

    2018 

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    Event date: 2018.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Coverage Improvement by Bandwidth Control in Multi-Band Systems

    2018 

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    Event date: 2018.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Optimal Window Function Selecting Method for Signal Separation by Accumulation Batch signal processing

    2018 

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    Event date: 2018.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A collaborative non-linear distortion compensation method in both transmitter and receiver

    2018 

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    Event date: 2018.9.11 - 2018.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Interference Reduction Effect by Adaptive Bandwidth Control of Multi-Band Systems

    2018 

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    Event date: 2018.9.11 - 2018.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Compensation Method of Non-Linear Distortion in Both Transmitter and Receiver of LED Visible Light Communications

    2018 

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    Event date: 2018.8.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Inter-System Interference Evaluation in Spectrum Sharing Systems with Multiple Frequency Bands

    2018 

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    Event date: 2018.7.11 - 2018.7.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Receiver Noise Impact in Non-Linear Distortion Compensation for LED Visible Light Communications

    2018 

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    Event date: 2018.3.20 - 2018.3.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Reception Performance Improvement Method of Multi-Band Frequency Sharing Systems

    2017 

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    Event date: 2017.12.2 - 2017.12.3

    Language:Japanese   Presentation type:Poster presentation  

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  • Performance Evaluation by Non-Linear Factor Error in a Distortion Compensation Method

    2017 

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    Event date: 2017.12.2 - 2017.12.3

    Language:Japanese   Presentation type:Poster presentation  

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  • An Experimental Study of Radio Propagation Modeling for Underground Structure

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    Event date: 2017.12.2 - 2017.12.3

    Language:Japanese   Presentation type:Poster presentation  

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  • Reception characteristic of Multi-Band Frequency Sharing Systems Using Bandwidth Control

    2017 

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    Event date: 2017.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Non-Linear Distortion Compensation Method in a Receiver for LEDs of Visible Light Communications

    2017 

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    Event date: 2017.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Backoff Optimization of LEDs for Visible Light Wireless Communications

    2017 

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    Event date: 2017.9.12 - 2017.9.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Non-Linear Distortion Compensation Method in a Receiver of LED Visible Light Communications

    2017 

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    Event date: 2017.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Transmission Efficiency Improvement by Non-Liner Distortion Noise Power Control in Multi-Band Systems

    2017 

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    Event date: 2017.7.19 - 2017.7.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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

    2017 

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    Event date: 2017.6.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Transmission Performance Improvement by LED Linearization in Visible Light Communications

    2017 

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    Event date: 2017.3.22 - 2017.3.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Transmission Performance of Visible Light Communications Using Saturated LEDs

    2017 

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    Event date: 2017.3.1 - 2017.3.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Performance Improvement by Pre-Distortion for LED Non-Linearity in Visible Light Communications

    2016 

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    Event date: 2016.11.19 - 2016.11.20

    Language:Japanese   Presentation type:Poster presentation  

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  • Out-of-Band Noise Reduction Effect of Noise Control Signals in Multi-Band Systems

    2016 

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    Event date: 2016.11.19 - 2016.11.20

    Language:Japanese   Presentation type:Poster presentation  

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  • Transmission Efficiency Improvement by Non-Linear Distortion Noise Power Control in Multi-Band Systems

    2016 

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    Event date: 2016.10.27 - 2016.10.28

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Transmission Performance Degradation by Non-Linear Distortion of LEDs and its Compensation Method in Visible Light Communications

    2016 

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    Event date: 2016.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Noise Reduction Effect of Out-of-Band Noise Control Signals in Multi-Band Systems

    2016 

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    Event date: 2016.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Performance Evaluation by Input Power Limiting in Linearized LEDs for Visible Light Communications

    2016 

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    Event date: 2016.9.20 - 2016.9.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • LED可視光通信における非線形歪補償の効果

    熊谷 貴明, 松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    2016年電子情報通信学会総合大会  2016  電子情報通信学会

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    Event date: 2016.3.15 - 2016.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 傾斜地に市街地伝搬損失推定式を適用するための補正式の一検討

    大西 浩平, 島田 一槻, 平原 麗夏, 冨里 繁, 秦 正治

    2016年電子情報通信学会総合大会  2016  電子情報通信学会

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    Event date: 2016.3.15 - 2016.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • LED可視光通信の伝送回路における非線形歪補償法の検討

    熊谷 貴明, 松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    電子情報通信学会短距離無線通信研究会  2016  電子情報通信学会

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    Event date: 2016.3.2 - 2016.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • モバイル中継伝送における フェージング変動補償法の検討

    越智 崇氏, 冨里 繁, 秦 正治

    The 17th IEEE Hiroshima Student Symposium  2015  IEEE広島支部

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • マルチバンド方式の帯域外輻射電力を低減する使用帯域割当方法の検討

    植田 亮太郎, 冨里 繁, 秦 正治

    The 17th IEEE Hiroshima Student Symposium  2015  IEEE広島支部

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 周波数共用システムにおける帯域外輻射低減時の非線形歪雑音の配分方法

    金光 春樹, 藤澤 佑介, 冨里 繁, 秦 正治

    The 17th IEEE Hiroshima Student Symposium  2015  IEEE広島支部

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    Event date: 2015.11.21 - 2015.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 市街地伝搬損失推定式の傾斜地補正における見通し率の適用性に関する検討

    大西 浩平, 島田 一槻, 冨里 繁, 秦 正治

    電子情報通信学会アンテナ・伝播研究会  2015  電子情報通信学会

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    Event date: 2015.11.4 - 2015.11.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:那覇  

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  • 周波数共用システムの送信機における非線形歪雑音の配分方法の検討

    金光 春樹, 藤澤 佑介, 冨里 繁, 秦 正治

    平成27年度年電気・情報関連学会中国支部連合大会  2015  電気・情報関連学会

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口  

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  • マルチバンド方式の帯域外輻射電力を低減する使用帯域割当方法の検討

    植田 亮太郎, 冨里 繁, 秦 正治

    平成27年度年電気・情報関連学会中国支部連合大会  2015  電気・情報関連学会

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    Event date: 2015.10.17

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    Venue:山口  

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  • OFDM伝送を用いたLED可視光通信の周波数特性の影響評価

    熊谷 貴明, 松野 弘明, 冨里 繁, 秦 正治

    平成27年度年電気・情報関連学会中国支部連合大会  2015  電気・情報関連学会

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    Event date: 2015.10.17

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    Venue:山口  

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  • 基地局が傾斜地エリアを見下ろす場合の仰角補正法の適用性に関する検討

    大西 浩平, 高橋 宏之, 冨里 繁, 秦 正治

    平成27年度年電気・情報関連学会九州支部連合大会  2015  電気・情報関連学会

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    Event date: 2015.9.26 - 2015.9.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 可視光通信用LEDの非線形歪による伝送品質への影響評価

    松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    2015年電子情報通信学会ソサイエティ大会  2015  電子情報通信学会

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    Event date: 2015.9.8 - 2015.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • 基地局が見下ろす場合の異なる傾斜地エリアにおける移動伝搬損失特性の比較検討

    大西 浩平, 亀井 瑛太, 冨里 繁, 秦 正治

    2015年電子情報通信学会ソサイエティ大会  2015  電子情報通信学会

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    Event date: 2015.9.8 - 2015.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • LED可視光通信における非線形歪補償方法の検討

    松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    電子情報通信学会短距離無線通信研究会  2015  電子情報通信学会

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    Event date: 2015.8.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 市街地伝搬損失推定式の傾斜地補正における見通し率の定義に関する検討

    大西 浩平, 三木 純平, 冨里 繁, 秦 正治

    電子情報通信学会アンテナ・伝播研究会  2015  電子情報通信学会

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    Event date: 2015.7.30 - 2015.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:稚内  

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  • コグニティブ無線用送信機における 非線形歪雑音電力配分手法の検討

    藤澤 佑介, 冨里 繁, 秦 正治

    電子情報通信学会スマート無線研究会  2015  電子情報通信学会

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    Event date: 2015.7.29 - 2015.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野  

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  • LED可視光通信における変調精度の実験的検討

    松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    2015年電子情報通信学会総合大会  2015  電子情報通信学会

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    Event date: 2015.3.10 - 2015.3.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:草津  

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  • 道路地理情報を考慮した傾斜地における市街地伝搬損失推定に関する一検討

    新 浩一, 西 正博, 秦 正治, 市坪 信一, 冨里 繁

    電子情報通信学会アンテナ・伝播研究会  2015  電子情報通信学会

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    Event date: 2015.1.22 - 2015.1.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

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  • 可視光通信を用いたLTE信号伝送実験における変調精度評価

    松野 弘明, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    電子情報通信学会短距離無線通信研究会  2014  電子情報通信学会

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    Event date: 2014.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • OFDM伝送を用いた周波数共用システムにおける非線形歪雑音電力配分法の検討

    藤澤 佑介, 冨里 繁, 秦 正治

    The 16th IEEE Hiroshima Student Symposium  2014  IEEE広島支部

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    Event date: 2014.11.15 - 2014.11.16

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島  

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  • モバイル中継伝送におけるマルチパスフェージングの影響に関する検討

    越智 崇氏, 冨里 繁, 秦 正治

    The 16th IEEE Hiroshima Student Symposium  2014  IEEE広島支部

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    Event date: 2014.11.15 - 2014.11.16

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島  

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  • セルラ基地局が傾斜地エリアを見下ろす場合の伝搬損失補正式の検討

    高橋 宏之, 大西 浩平, 西 正博, 新 浩一, 市坪 信一, 冨里 繁, 秦 正治

    電子情報通信学会アンテナ・伝播研究会  2014  電子情報通信学会

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    Event date: 2014.11.12 - 2014.11.14

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山形  

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  • Non-linear distortion noise control according to modulation schemes for spectrum sharing systems International conference

    SmartCom2014  2014 

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    Event date: 2014.10.30 - 2014.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • マルチバンドセルラ方式における帯域外輻射を考慮した適応フィルタリング手法

    松野 弘明, 正木 翔平, 冨里 繁, 秦 正治

    平成26年度年電気・情報関連学会中国支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山  

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  • モバイル中継伝送におけるフェージング変動の影響評価

    越智 崇氏, 冨里 繁, 秦 正治

    平成26年度年電気・情報関連学会中国支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山  

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  • 災害時における船舶携帯無線基地局の運用条件に関する検討

    大西 浩平, 小寺 智也, 冨里 繁, 秦 正治

    平成26年度年電気・情報関連学会中国支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山  

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  • OFDM伝送を用いた周波数共用システムにおけるクリップレベル最適化の検討

    藤澤 佑介, 冨里 繁, 秦 正治

    平成26年度年電気・情報関連学会中国支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.10.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福山  

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  • マルチバンドOFDM伝送における繰り返しクリップとフィルタリング手法の効果

    正木 翔平, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    2014年電子情報通信学会ソサイエティ大会  2014  電子情報通信学会

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    Event date: 2014.9.23 - 2014.9.26

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 市街地伝搬損失推定式を傾斜地に適用するための補正式に関する一検討

    大西 浩平, 市坪 信一, 新 浩一, 西 正博, 冨里 繁, 秦 正治

    平成26年度年電気・情報関連学会九州支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.9.18 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島  

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  • 見通しがあるときの傾斜地伝搬損失推定の検討

    瀬尾 高徳, 市坪 信一, 秦 正治, 冨里 繁

    平成26年度年電気・情報関連学会九州支部連合大会  2014  電気・情報関連学会

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    Event date: 2014.9.18 - 2014.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島  

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  • 適応送信型センサ協調ビーム形成法における周波数オフセットの影響

    藤田 将大, 小椋 あかね, 冨里 繁, 田野 哲, 秦 正治

    電子情報通信学会短距離無線通信研究会  2014  電子情報通信学会

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    Event date: 2014.8.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀  

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  • コグニティブ無線用OFDM伝送システムにおける非線形歪雑音電力制御手法

    片岡 連, 藤澤 佑介, 冨里 繁, 秦 正治

    電子情報通信学会スマート無線研究会  2014  電子情報通信学会

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    Event date: 2014.7.30 - 2014.8.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

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  • 適応送信型センサ協調ビーム形成法の受信特性

    藤田 将大, 冨里 繁, 田野 哲, 秦 正治

    電子情報通信学会無線通信システム研究会  2014  電子情報通信学会

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    Event date: 2014.7.30 - 2014.8.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

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  • センサネットワークシステムのための特異値分解を用いた繰返し周波数オフセット推定

    田野 哲, 長谷部 雅孝, 冨里 繁, 秦 正治

    電子情報通信学会短距離無線通信研究会  2014  電子情報通信学会

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    Event date: 2014.6.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鎌倉  

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  • 適応送信型センサ協調ビーム形成法における送信位相誤差の影響評価

    藤田 将大, 別府 多久哉, 冨里 繁, 田野 哲, 秦 正治

    2014年電子情報通信学会総合大会  2014  電子情報通信学会

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    Event date: 2014.3.18 - 2014.3.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟  

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  • 異なる市街地の傾斜地エリアにおける伝搬損失特性の比較検討

    平井 尊教, 瀬尾 高徳, 林 和貴, 市坪 信一, 新 浩一, 西 正博, 秦 正治, 冨里 繁

    2014年電子情報通信学会総合大会  2014  電子情報通信学会

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    Event date: 2014.3.18 - 2014.3.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟  

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  • マルチバンドOFDM伝送における非線形歪雑音低減手法

    正木 翔平, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    2014年電子情報通信学会総合大会  2014  電子情報通信学会

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    Event date: 2014.3.18 - 2014.3.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟  

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  • マルチバンドを用いるOFDM伝送の帯域外輻射特性

    正木 翔平, 冨里 繁, 田野 哲, 秦 正治, 古野 辰男, 小田 恭弘

    電子情報通信学会ソフトウェア無線研究会  2014  電子情報通信学会

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    Event date: 2014.1.23 - 2014.1.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • 傾斜地伝搬損失推定に対するスケールモデルと実環境測定に基づく補正法の検討

    瀬尾 高徳, 栗林 拓也, 堤 拓也, 市坪 信一, 秦 正治, 冨里 繁

    電子情報通信学会アンテナ・伝播研究会  2014  電子情報通信学会

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    Event date: 2014.1.22 - 2014.1.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島  

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  • 適応送信型センサ協調ビーム形成法の消費電力低減効果

    藤田 将大, 別府 多久哉, 冨里 繁, 田野 哲, 秦 正治

    The 15th IEEE Hiroshima Student Symposium  2013  IEEE広島支部

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    Event date: 2013.11.16 - 2013.11.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鳥取  

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  • 傾斜地伝搬損失補正における要素パラメータの事前推定法の検討

    大西 浩平, 平井 尊教, 高橋 宏之, 秦 正治, 冨里 繁

    The 15th IEEE Hiroshima Student Symposium  2013  IEEE広島支部

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    Event date: 2013.11.16 - 2013.11.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鳥取  

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  • 傾斜地エリアに対する伝搬損失補正式の適用性の比較検討?岡山と小倉の場合?

    平井 尊教, 瀬尾 高徳, 市坪 信一, 秦 正治, 冨里 繁

    The 15th IEEE Hiroshima Student Symposium  IEEE広島支部

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    Event date: 2013.11.16 - 2013.11.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:鳥取  

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  • 複数の傾斜地を考慮した携帯電話の電波伝搬損失特性の検討

    林 和貴, 平井 尊教, 新 浩一, 西 正博, 秦 正治, 市坪 信一, 冨里 繁, 吉田 彰顕

    情報処理学会モバイルコンピューティングとユビキタス通信研究会  2013  情報処理学会

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    Event date: 2013.11.14 - 2013.11.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • スケールモデルと実環境の測定による傾斜地伝搬損失を推定する補正方法の検討

    瀬尾 高徳, 栗林 拓也, 堤 拓也, 市坪 信一, 秦 正治, 冨里 繁

    第577回URSI-F会合  2013  URSI-F

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    Event date: 2013.11.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

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  • マルチバンドを利用するセルラ方式における帯域外輻射特性評価

    正木 翔平, 冨里 繁, 秦 正治

    平成25年度年電気・情報関連学会中国支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 傾斜地エリアを見下ろすセルラ基地局に関する伝搬損失特性の検討

    高橋 宏之, 林 和貴, 平井 尊教, 新 浩一, 西 正博, 秦 正治, 冨里 繁

    平成25年度年電気・情報関連学会中国支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 適応送信を用いたセンサ協調ビーム形成法における省電力効果

    藤田 将大, 別府 多久哉, 冨里 繁, 秦 正治

    平成25年度年電気・情報関連学会中国支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 周波数共用システムの変調方式を考慮した送信電力制御手法

    片岡 連, 冨里 繁, 秦 正治

    平成25年度年電気・情報関連学会中国支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.10.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 傾斜地エリアを見上げるセルラ基地局に関する伝搬損失特性の検討

    平井 尊教, 瀬尾 高徳, 市坪 信一, 秦 正治, 冨里 繁

    平成25年度年電気・情報関連学会九州支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.9.24 - 2013.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スケールモデル手法による傾斜地伝搬損失特性の検討

    瀬尾 高徳, 高橋 宏之, 市坪 信一, 秦 正治, 冨里 繁

    平成25年度年電気・情報関連学会九州支部連合大会  2013  電気・情報関連学会

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    Event date: 2013.9.24 - 2013.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 周波数共用システムにおけるサブキャリア間隔による帯域利用率

    池田 敦, 冨里 繁, 秦 正治

    2013年電子情報通信学会ソサイエティ大会  2013  電子情報通信学会

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    Event date: 2013.9.17 - 2013.9.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 異なる傾斜地エリアに対する伝搬損失補正式の適用性の検討

    平井 尊教, 林 和貴, 新 浩一, 西 正博, 秦 正治, 冨里 繁

    2013年電子情報通信学会ソサイエティ大会  2013  電子情報通信学会

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    Event date: 2013.9.17 - 2013.9.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • センサ協調ビーム形成法における適応送信手法による受信特性改善効果

    別府 多久哉, 藤田 将大,冨里 繁, 田野 哲,秦 正治

    電子情報通信学会短距離無線通信研究会  2013  電子情報通信学会

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 干渉電力推定に基づく周波数共用帯域の送信電力制御手法

    池田 敦, 冨里 繁, 藤井 啓正, 秦 正治

    電子情報通信学会無線通信システム研究会  2013  電子情報通信学会

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    Event date: 2013.4.18 - 2013.4.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野  

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  • 干渉電力推定を用いる周波数共用システムの未使用帯域利用効率

    池田 敦, 冨里 繁, 藤井 啓正, 秦 正治

    2013年電子情報通信学会総合大会  2013  電子情報通信学会

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    Event date: 2013.3.19 - 2013.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜  

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  • 周波数共用における非優先システムの干渉電力推定手法

    池田 敦, 冨里 繁, 藤井 啓正, 秦 正治

    電子情報通信学会ソフトウェア無線研究会  2013  電子情報通信学会

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    Event date: 2013.1.24 - 2013.1.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長野  

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  • SVDを用いた周波数オフセット推定法における特性改善法

    長谷部 雅孝, 田野 哲,冨里 繁, 秦 正治

    電子情報通信学会短距離無線通信研究会  2012  電子情報通信学会

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    Event date: 2012.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:川崎  

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  • 周波数共用システムにおけるスペクトラム整形による干渉低減効果

    駒林 利宣, 冨里 繁, 秦 正治

    The 14th IEEE Hiroshima Student Symposium  2012  IEEE広島支部

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    Event date: 2012.11.17 - 2012.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • セルラ方式における傾斜地エリア伝搬損失推定法の比較検討

    平井 尊教, 大平 智弘, 冨里 繁, 秦 正治

    The 14th IEEE Hiroshima Student Symposium  2012  IEEE広島支部

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    Event date: 2012.11.17 - 2012.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Leeモデルによる傾斜地エリア移動伝搬損失特性推定法の一検討

    平井 尊教, 大平 智弘, 冨里 繁, 秦 正治

    電気・情報関連学会中国支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • モバイル中継伝送における伝搬遅延の影響評価

    長谷部 雅孝, 冨里 繁, 秦 正治

    電気・情報関連学会中国支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • 周波数共用における非優先システムの干渉推定に基づく送信電力制御法

    池田 敦, 冨里 繁, 秦 正治

    電気・情報関連学会中国支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • センサネットワーク用協調ビーム形成法における適応送信手法の検討

    別府 多久哉, 冨里 繁, 田野 哲,秦 正治

    電気・情報関連学会中国支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.10.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • 市街地における傾斜地エリア伝搬損失特性の実験検討

    大平 智弘, 行衛 秀明, 瀬尾 高徳, 市坪 信一, 秦 正治, 冨里 繁

    電気・情報関連学会九州支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.9.24 - 2012.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長崎  

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  • 傾斜地における伝搬損失特性

    行衛 秀明, 瀬尾 高徳, 大平 智弘, 市坪 信一, 秦 正治, 冨里 繁

    電気・情報関連学会九州支部連合大会  2012  電気・情報関連学会

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    Event date: 2012.9.24 - 2012.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長崎  

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  • 周波数共用における変調方式に応じた非線形歪雑音制御手法

    岡本 誠一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    2012年電子情報通信学会ソサイエティ大会  2012  電子情報通信学会

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    Event date: 2012.9.11 - 2012.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山  

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  • 周波数共用における非線形歪雑音制御による受信特性改善効果

    岡本 誠一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    電子情報通信学会無線通信システム研究会  2012  電子情報通信学会

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    Event date: 2012.8.30 - 2012.8.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高知  

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  • センサネットワーク用送信センサ選択型協調ビーム形成法の一検討

    平井 大暁, 冨里 繁, 田野 哲,秦 正治

    電子情報通信学会短距離無線通信研究会  2012  電子情報通信学会

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    Event date: 2012.8.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 同一チャネル干渉下におけるセンサネットワーク用周波数オフセット推定法の検討

    長谷部 雅孝, 田野 哲,冨里 繁, 秦 正治

    電子情報通信学会短距離無線通信研究会  2012  電子情報通信学会

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    Event date: 2012.8.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 無線メッシュネットワークにおけるWDSクラスタ分割アルゴリズムのスマートアンテナ拡張の一般化

    田島滋人, 舩曵信生, 冨里 繁, 秦 正治, 東野輝夫

    電子情報通信学会ネットワークシステム研究会  2012  電子情報通信学会

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    Event date: 2012.4.19 - 2012.4.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高知  

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  • 周波数共用システムにおける非線形歪雑音の適応制御手法の検討

    岡本 誠一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    2012年電子情報通信学会総合大会  2012  電子情報通信学会

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    Event date: 2012.3.20 - 2012.3.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 同一チャネル干渉下での周波数オフセット推定法の検討

    松本 祐也, 田野 哲, 冨里 繁, 秦 正治

    電子情報通信学会無線通信システム研究会  2012  電子情報通信学会

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    Event date: 2012.1.26 - 2012.1.27

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 無線メッシュネットワークでの2個のスマートアンテナ使用アクセスポイントを有するWDSクラスタへの分割アルゴリズム

    田島 滋人, 舩曵 信生, 冨里 繁, 秦 正治,東野 輝夫

    電子情報通信学会ネットワークシステム研究会  2011  電子情報通信学会

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    Event date: 2011.12.15 - 2011.12.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口  

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  • 周波数共用システムにおける非線形歪電力制御の検討

    岡本 誠一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    電子情報通信学会無線通信システム研究会  2011  電子情報通信学会

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    Event date: 2011.12.15 - 2011.12.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口  

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  • OFDMA方式におけるクリップレベル制御によるピーク電力低減効果

    宮崎 千尋, 冨里 繁, 秦 正治

    The 13th IEEE Hiroshima Student Symposium  2011  IEEE広島支部

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    Event date: 2011.11.12 - 2011.11.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • フェムトセルを用いるセルラ方式の屋外干渉特性の検討

    河野 立志, 冨里 繁, 秦 正治

    The 13th IEEE Hiroshima Student Symposium  2011  IEEE広島支部

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    Event date: 2011.11.12 - 2011.11.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 分散MIMOチャネル伝送における高精度タイミング同期手法

    松本 祐也, 冨里 繁, 田野 哲, 秦 正治

    The 13th IEEE Hiroshima Student Symposium  2011  IEEE広島支部

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    Event date: 2011.11.12 - 2011.11.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 中山間地域WiMAXシステムにおける基地局配置の検討

    大平 智弘, 冨里 繁, 秦 正治

    平成23年度年電気・情報関連学会中国支部連合大会  2011  電子情報通信学会

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    Event date: 2011.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 周波数共用システムにおけるOFDM信号の送信スペクトラム整形手法

    駒林 利宣, 冨里 繁, 秦 正治

    平成23年度年電気・情報関連学会中国支部連合大会  2011  電子情報通信学会

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    Event date: 2011.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • モバイルアドホック通信用送信端末選択型協調ビーム形成法の検討

    平井 大暁, 冨里 繁, 秦 正治

    平成23年度年電気・情報関連学会中国支部連合大会  2011  電子情報通信学会

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    Event date: 2011.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • BWAシステムの中山間地域におけるエリア推定法の検討

    大平 智弘, 冨里 繁, 秦 正治

    第16回岡山リサーチパーク研究・展示発表会  2011  岡山リサーチパーク

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    Event date: 2011.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 周波数共用システムにおける非線形歪電力制御手法

    岡本 誠一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    電子情報通信学会ソサイエティ大会  2011  電子情報通信学会

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    Event date: 2011.9.13 - 2011.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • 周波数共用システムにおけるサブキャリア間隔による干渉電力

    佐伯 拓也, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    電子情報通信学会ソサイエティ大会  2011  電子情報通信学会

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    Event date: 2011.9.13 - 2011.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • ゲートウェイにMIMOを用いた無線メッシュネットワークでのWDSクラスタ分割アルゴリズム

    田島 滋人, 舩曵 信生, 冨里 繁, 東野 輝夫

    電子情報通信学会ネットワークシステム研究会  2011  電子情報通信学会

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    Event date: 2011.4.21 - 2011.4.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 周波数共用システムにおける非線形歪による干渉電力増大

    佐伯 拓也, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二, 加山 英俊

    電子情報通信学会総合大会  2011  電子情報通信学会

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    Event date: 2011.3.14 - 2011.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 周波数共用時のOFDMA方式における干渉特性評価

    福田 祐一郎, 冨里 繁, 藤井 啓正, 秦 正治, 三浦 俊二

    電子情報通信学会無線通信システム研究会  2010  電子情報通信学会

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    Event date: 2010.12.16 - 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • セルラ方式の無線回線設計における傾斜地伝搬損失補正の検討

    藤谷 崇弘, 河野 立志, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • 送受信センサ協調ビーム形成法におけるフェージング変動の影響

    中野 淳次郎, 駒田 善紀, 冨里 繁, 田野 哲, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • センサ協調ビーム形成法における協調受信センサ数による消費電力低減効果

    駒田 善紀, 中野 淳次郎, 冨里 繁, 田野 哲, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • 屋内無線システムの隣接エリア漏洩電力に関する実験的検討

    河野 立志, 藤谷 崇弘, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2010  IEEE広島支部

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    Event date: 2010.11.6 - 2010.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • センサネットワーク用送受信協調ビーム形成法の省電力効果

    駒田 善紀, 冨里 繁, 秦 正治

    平成22年度年電気・情報関連学会中国支部連合大会  2010  電子情報通信学会

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    Event date: 2010.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 電力増幅器の歪電力を考慮したOFDMA方式におけるSINR分布特性

    佐伯 拓也, 冨里 繁, 秦 正治

    平成22年度年電気・情報関連学会中国支部連合大会  2010  電子情報通信学会

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    Event date: 2010.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • OFDM伝送用ピーク電力低減用サブキャリア逐次選択法による伝送特性評価

    宮崎 千尋, 冨里 繁, 秦 正治

    平成22年度年電気・情報関連学会中国支部連合大会  2010  電子情報通信学会

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    Event date: 2010.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 無線LANの建物内外における受信レベル特性の一検討

    河野 立志,藤谷 崇弘, 冨里 繁, 秦 正治

    平成22年度年電気・情報関連学会中国支部連合大会  2010  電子情報通信学会

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    Event date: 2010.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • MIMOチャネル中継伝送における非線形歪の影響評価

    松本 祐也, 冨里 繁, 秦 正治

    平成22年度年電気・情報関連学会中国支部連合大会  2010  電子情報通信学会

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    Event date: 2010.10.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • OFDMA方式における送信電力制御時のスペクトラム特性

    福田 祐一郎, 冨里 繁, 藤井 啓正, 秦 正治, 浅井 孝浩, 奥村 幸彦

    電子情報通信学会ソサイエティ大会  2010  電子情報通信学会

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    Event date: 2010.9.14 - 2010.9.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:堺  

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  • 市街地伝搬損失推定式の傾斜地補正に関する一検討

    藤谷 崇弘, 河野 立志, 冨里 繁, 秦 正治

    電子情報通信学会ソサイエティ大会  2010  電子情報通信学会

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    Event date: 2010.9.14 - 2010.9.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:堺  

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  • 周波数共用時のLNBによる非線形歪特性

    福田 祐一郎, 冨里 繁, 藤井 啓正, 秦 正治, 浅井 孝浩, 奥村 幸彦

    電子情報通信学会総合大会  2010  電子情報通信学会

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    Event date: 2010.3.16 - 2010.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • LNBによる非線形歪評価における非線形モデル適用に関する検討

    藤井 啓正, 浅井 孝浩, 奥村 幸彦, 赤澤 逸人, 外山 隆行, 福田 祐一郎, 冨里 繁, 秦 正治

    電子情報通信学会総合大会  2010  電子情報通信学会

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    Event date: 2010.3.16 - 2010.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • MIMOチャネル中継伝送用アンテナ選択法のフェージング伝搬路における受信特性

    勝部 孝行, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2009 

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

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  • 傾斜地エリアにおける移動伝搬損失推定式の一検討

    藤谷 崇弘, 高橋 倫理, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2009 

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

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  • 市街地および郊外地キャンパスにおける移動伝搬損失特性

    高橋 倫理, 藤谷 崇弘, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2009 

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

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  • 送受信センサ協調型ビーム形成法の伝送特性

    中野 淳次郎, 冨里 繁, 秦 正治

    The 11th IEEE Hiroshima Student Symposium  2009 

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    Event date: 2009.11.21 - 2009.11.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

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  • セルラCDMA方式の傾斜地エリアにおける電波伝搬特性

    藤谷 崇弘, 高橋 倫理, 冨里 繁, 秦 正治

    平成21年度年電気・情報関連学会中国支部連合大会  2009  電気・情報関連学会中国支部

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    Event date: 2009.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • センサネットワーク用送受信協調ビーム形成法の検討

    中野 淳次郎, 冨里 繁, 秦 正治

    平成21年度年電気・情報関連学会中国支部連合大会  2009  電気・情報関連学会中国支部

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    Event date: 2009.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • MIMOチャネル中継伝送におけるフェージング変動の影響評価

    勝部 孝行, 冨里 繁, 秦 正治

    平成21年度年電気・情報関連学会中国支部連合大会  2009  電気・情報関連学会中国支部

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    Event date: 2009.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • OFDMA方式用ソフトクリップ手法による歪電力制御特性

    藤原 稔久, 冨里 繁, 秦 正治, 藤井 啓正, 浅井 孝浩, 奥村 幸彦

    2009年電子情報通信学会ソサイエティ大会  2009  電子情報通信学会

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    Event date: 2009.9.15 - 2009.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟市  

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  • DFTS-OFDM伝送における非線形歪の影響評価

    福田 祐一郎, 冨里 繁, 秦 正治, 藤井 啓正, 浅井 孝浩, 奥村 幸彦

    2009年電子情報通信学会ソサイエティ大会  2009  電子情報通信学会

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    Event date: 2009.9.15 - 2009.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟市  

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  • OFDMA方式用繰り返しピーク低減のためのクリップ雑音キャンセラ

    守 由圭里, 冨里 繁, 秦 正治, 藤井 啓正

    2009年日本シミュレーション学会大会  2009 

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    Event date: 2009.6.12 - 2009.6.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都江東区  

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  • ソフトクリップ制御を用いたOFDMA方式の帯域外輻射特性

    藤原 稔久, 冨里 繁, 秦 正治, 藤井 啓正, 吉野 仁

    2009年電子情報通信学会総合大会  2009  電子情報通信学会

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    Event date: 2009.3.17 - 2009.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市  

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  • クリップ雑音キャンセラを用いたOFDMA方式における非線形歪の影響評価

    守 由圭里, 楠木 香織, 冨里 繁, 秦 正治, 藤井 啓正, 吉野 仁

    2009年電子情報通信学会総合大会  2009  電子情報通信学会

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    Event date: 2009.3.17 - 2009.3.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市  

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  • ブロードバンドOFDM伝送における高効率化技術

    冨里 繁

    益々拡大するOFDM技術のワイヤレスへの応用  2009  電子情報通信学会東京支部

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    Event date: 2009.2.4

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京  

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  • 地方都市におけるワンセグTV放送の移動受信レベル推定

    前田 兵五, *冨里 繁, 秦 正治

    The 10th IEEE Hiroshima Student Symposium  2008 

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    Event date: 2008.11.21 - 2008.11.23

    Presentation type:Poster presentation  

    Venue:広島  

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  • スペクトラム整形を用いたCI符号化OFDM信号の伝送特性

    守 由圭里, *冨里 繁, 秦 正治

    The 10th IEEE Hiroshima Student Symposium  2008 

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    Event date: 2008.11.21 - 2008.11.23

    Presentation type:Poster presentation  

    Venue:広島  

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  • UWB端末の屋内無線LANへの干渉距離に関する検討

    佐々岡 隆, *冨里 繁, 秦 正治

    The 10th IEEE Hiroshima Student Symposium  2008 

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    Event date: 2008.11.21 - 2008.11.23

    Presentation type:Poster presentation  

    Venue:広島  

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  • CI符号化OFDM伝送におけるスペクトラム整形の効果

    守 由圭里, *冨里 繁, 秦 正治

    平成20年度年電気・情報関連学会中国支部連合大会  2008 

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    Event date: 2008.10.25

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 市街地キャンパスにおけるセルラCDMA方式の電波伝搬特性

    高橋 倫理, *冨里 繁, 秦 正治

    平成20年度年電気・情報関連学会中国支部連合大会  2008 

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    Event date: 2008.10.25

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 歪電力制御手法を用いた低ピークOFDM送信信号生成法の検討

    藤原 稔久, *冨里 繁, 秦 正治

    平成20年度年電気・情報関連学会中国支部連合大会  2008 

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    Event date: 2008.10.25

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • OFDM伝送用適応ピーク低減サブキャリア挿入法

    鳥羽 倫太郎,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年電子情報通信学会ソサイエティ大会  2008 

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    Event date: 2008.9.16 - 2008.9.19

    Presentation type:Oral presentation (general)  

    Venue:川崎市  

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  • 移動通信の伝搬損失推定における建物占有面積率の近似方法

    塩見 崇峰, 川村 雅彦, 嶌森 陸郎, 小松 覚, 秦 正治, *冨里 繁

    2008年電子情報通信学会ソサイエティ大会  2008 

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    Event date: 2008.9.16 - 2008.9.19

    Presentation type:Oral presentation (general)  

    Venue:川崎市  

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  • 中間オーバサンプリング手法を用いたOFDMA方式の伝送特性

    藤本 和彦,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年電子情報通信学会ソサイエティ大会  2008 

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    Event date: 2008.9.16 - 2008.9.19

    Presentation type:Oral presentation (general)  

    Venue:川崎市  

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  • 中山間地域におけるBWAシステムの実証実験?無線回線設計?

    大野 真, 秦 正治, *冨里 繁, 美甘 幸路

    2008年電子情報通信学会ソサイエティ大会 

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    Event date: 2008.9.16 - 2008.9.19

    Presentation type:Oral presentation (general)  

    Venue:川崎市  

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  • OFDM伝送用ピーク電力低減信号の段階的生成法

    鳥羽 倫太郎,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年日本シミュレーション学会大会  2008 

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    Event date: 2008.6.19 - 2008.6.20

    Presentation type:Oral presentation (general)  

    Venue:草津市  

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  • OFDMA方式用繰り返しピーク電力低減における演算量削減手法

    藤本 和彦,冨永 直,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年日本シミュレーション学会大会  2008 

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    Event date: 2008.6.19 - 2008.6.20

    Presentation type:Oral presentation (general)  

    Venue:草津市  

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  • OFDM伝送におけるピーク電力低減信号段階的生成法

    鳥羽 倫太郎,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年電子情報通信学会総合大会  2008 

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    Event date: 2008.3.18 - 2008.3.21

    Presentation type:Oral presentation (general)  

    Venue:北九州市  

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  • OFDMA方式用繰り返しピーク電力低減手法の検討

    藤本 和彦,冨永 直,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2008年電子情報通信学会総合大会  2008 

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    Event date: 2008.3.18 - 2008.3.21

    Presentation type:Oral presentation (general)  

    Venue:北九州市  

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  • 屋内無線通信におけるアクセスポイント配置の検討

    伊藤 雄大, *冨里 繁, 秦 正治

    The 9th IEEE Hiroshima Student Symposium  2007 

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    Event date: 2007.11.24 - 2007.11.25

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • センサ協調型送信ビーム形成法における送信位相誤差の影響

    橋本 謙一, 田野 哲, *冨里 繁, 秦 正治

    The 9th IEEE Hiroshima Student Symposium  2007 

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    Event date: 2007.11.24 - 2007.11.25

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • サイト/セクタ間ダイバーシチを用いるMIMOチャネル伝送方式の受信特性

    徳永 宗介, 橋本 謙一, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • UWBシステムと無線LANとの周波数共用に関する一検討

    佐々岡 隆, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • ピーク低減サブキャリア挿入とクリッピングによる低ピークOFDM信号生成法

    鳥羽 倫太郎, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • MIMOチャネル中継伝送における送受信アンテナ選択法の検討

    藤本 和彦, 藤澤 亨, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 屋内エリアにおけるセルラCDMA方式の伝搬損失特性

    前田 兵五, 伊藤 雄大, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • セルラCDMA方式の受信点高の関する屋外伝搬損失特性

    伊藤 雄大, 伊藤 良一, 前田 兵五, *冨里 繁, 秦 正治

    平成19年度年電気・情報関連学会中国支部連合大会  2007 

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    Event date: 2007.10.20

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 電力増幅器非線形歪を考慮した低ピーク化OFDM信号の伝送特性

    藤澤 亨,藤井 啓正,*冨里 繁,秦 正治,萩原 淳一郎

    2007年電子情報通信学会ソサイエティ大会  2007 

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    Event date: 2007.9.10 - 2007.9.14

    Venue:鳥取  

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  • OFDMA方式におけるクリッピングによる受信特性への影響評価

    光藤 直人,*冨里 繁,藤井 啓正,秦 正治,萩原 淳一郎

    2007年電子情報通信学会ソサイエティ大会  2007 

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    Event date: 2007.9.10 - 2007.9.14

    Venue:鳥取  

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  • 帯域外輻射を考慮したOFDM信号低ピーク電力化手法

    藤澤 亨,松田 敏之,藤井 啓正,*冨里 繁,秦 正治,萩原 淳一郎

    2007年電子情報通信学会総合大会  2007 

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    Event date: 2007.3.20 - 2007.3.23

    Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • センサネットワークにおけるセンサ協調型ビーム形成法の検討

    徳倉 基之, 田野 哲, *冨里 繁, 秦 正治, 森広 芳照

    The 8th IEEE Hiroshima Student Symposium  2006 

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    Event date: 2006.11.25 - 2006.11.26

    Venue:広島  

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  • ピーク低減用サブキャリアによるOFDM信号の低ピーク電力化

    西崎 正春, *冨里 繁, 秦 正治, 藤井 啓正, 萩原 淳一郎

    電子情報通信学会 無線通信システム研究会  2006 

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    Event date: 2006.11.16 - 2006.11.17

    Venue:伊東  

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  • 高能率変調を用いた繰り返しピーク電力低減型OFDM伝送方式

    光藤 直人, *冨里 繁, 秦 正治

    平成18年度年電気・情報関連学会中国支部連合大会  2006 

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    Event date: 2006.10.21

    Venue:岡山  

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  • 中継局を用いるMIMOチャネル伝送方式の受信特性

    藤澤 亨, *冨里 繁, 秦 正治

    平成18年度年電気・情報関連学会中国支部連合大会  2006 

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    Event date: 2006.10.21

    Venue:岡山  

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  • セルラCDMA方式の大学キャンパスにおける電波伝搬特性

    伊藤 雄大, *冨里 繁, 秦 正治

    平成18年度年電気・情報関連学会中国支部連合大会  2006 

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    Event date: 2006.10.21

    Venue:岡山  

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  • MIMOチャネル伝送におけるセクタ間ダイバーシティの受信特性改善効果

    橋本 謙一, *冨里 繁, 秦 正治

    平成18年度年電気・情報関連学会中国支部連合大会  2006 

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    Event date: 2006.10.21

    Venue:岡山  

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  • センサネットワーク用協調ビーム形成法の検討

    徳倉 基之, 田野 哲, *冨里 繁, 秦 正治, 森広 芳照

    2006年電子情報通信学会ソサイエティ大会  2006 

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    Event date: 2006.9.19 - 2006.9.22

    Venue:金沢  

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  • OFDMシンボル間の不連続性による帯域外輻射特性評価

    松田 敏之, 藤井 啓正, *冨里 繁, 秦 正治

    2006年電子情報通信学会ソサイエティ大会  2006 

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    Event date: 2006.9.19 - 2006.9.22

    Venue:金沢  

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  • ピーク低減用サブキャリア挿入による低ピークOFDM信号生成法

    西崎 正春, *冨里 繁, 秦 正治, 藤井 啓正

    2006年電子情報通信学会ソサイエティ大会  2006 

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    Event date: 2006.9.19 - 2006.9.22

    Venue:金沢  

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  • OFDM信号繰り返しピーク低減法における帯域制限の影響

    松田 敏之,*冨里 繁,秦 正治,藤井 啓正,吉野 仁

    2006年電子情報通信学会総合大会  2006 

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    Event date: 2006.3.24 - 2006.3.27

    Venue:東京  

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  • UHF帯におけるCDMA移動通信とTV放送との周波数共用に関する検討

    井上 雅智, *冨里 繁, 秦 正治

    The 7th IEEE Hiroshima Student Symposium  2005 

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    Event date: 2005.11.26 - 2005.11.27

    Venue:岡山  

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  • CDMA移動通信におけるトラヒック分布特性とシステム容量の検討

    白石 成浩,*冨里 繁,秦 正治

    The 7th IEEE Hiroshima Student Symposium  2005 

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    Event date: 2005.11.26 - 2005.11.27

    Venue:岡山  

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  • 高能率OFDM伝送における適応ピーク低減信号生成法の検討

    西崎 正春,久保 明子,*冨里 繁,秦 正治

    The 7th IEEE Hiroshima Student Symposium  2005 

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    Event date: 2005.11.26 - 2005.11.27

    Venue:岡山  

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  • CDMA移動通信における分散アンテナ技術を用いた屋内エリア構成法

    西崎 正春,*冨里 繁,秦 正治

    平成17年度年電気・情報関連学会中国支部連合大会  2005 

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    Event date: 2005.10.22

    Venue:福山  

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  • OFDM伝送における他システム共存時の受信特性

    松田 敏之,*冨里 繁,秦 正治

    平成17年度年電気・情報関連学会中国支部連合大会  2005 

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    Event date: 2005.10.22

    Venue:福山  

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  • MIMOチャネル伝送におけるサイトダイバーシティによる受信特性改善効果

    徳倉 基之,*冨里 繁,秦 正治

    平成17年度年電気・情報関連学会中国支部連合大会  2005 

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    Event date: 2005.10.22

    Venue:福山  

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  • 繰り返し適応ピーク低減信号生成法を用いたOFDM伝送の受信特性

    久保 明子,*冨里 繁,秦 正治

    2005年電子情報通信学会ソサイエティ大会  2005 

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    Event date: 2005.9.20 - 2005.9.23

    Venue:札幌  

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  • UHF帯TV放送と移動通信の隣接干渉に関する一考察

    井上 雅智, 冨里 繁, 秦 正治

    2005年電子情報通信学会ソサイエティ大会  2005 

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    Event date: 2005.9.20 - 2005.9.23

    Venue:札幌  

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  • CDMA移動通信におけるエリア内集中トラヒック分布時のシステム容量

    白石 成浩,*冨里 繁,秦 正治

    2005年電子情報通信学会ソサイエティ大会  2005 

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    Event date: 2005.9.20 - 2005.9.23

    Venue:札幌  

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  • 繰り返し生成による低ピークOFDM信号の受信特性

    久保 明子,上田 裕紀,*冨里 繁,秦 正治

    2005年電子情報通信学会総合大会  2005 

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    Event date: 2005.3.21 - 2005.3.24

    Venue:大阪  

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  • ピーク電力低減型OFDM伝送における非線形歪補償法の検討

    的形 恭平,久保 明子,*冨里 繁,秦 正治

    The 6th IEEE Hiroshima Student Symposium  2004 

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    Event date: 2004.12.5

    Venue:松江  

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  • CDMA移動通信の上り回線容量とシャドウイングに関する解析的検討

    大隅 祥貴,*冨里 繁,秦 正治

    The 6th IEEE Hiroshima Student Symposium  2004 

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    Event date: 2004.12.5

    Venue:松江  

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  • セルラ方式におけるトラヒック分布とシステム容量

    白石 成浩,*冨里 繁,秦 正治

    平成16年度年電気・情報関連学会中国支部連合大会  2004 

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    Event date: 2004.10.16

    Venue:山口  

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  • 移動通信におけるシステム間干渉とシステム容量の一検討

    井上 雅智,*冨里 繁,秦 正治

    平成16年度年電気・情報関連学会中国支部連合大会  2004 

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    Event date: 2004.10.16

    Venue:山口  

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  • セクタセル構成におけるサイトダイバーシティとブランチ数

    久保 明子,*冨里 繁,秦 正治

    平成16年度年電気・情報関連学会中国支部連合大会  2004 

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    Event date: 2004.10.16

    Venue:山口  

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  • TSDMA移動通信における上り回線の周波数利用率

    尾家 裕介,*冨里 繁,秦 正治

    平成16年度年電気・情報関連学会中国支部連合大会  2004 

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    Event date: 2004.10.16

    Venue:山口  

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  • CDMA移動通信における上り回線容量の解析的検討

    大隅 祥貴,*冨里 繁,秦 正治

    平成16年度年電気・情報関連学会中国支部連合大会  2004 

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    Event date: 2004.10.16

    Venue:山口  

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  • UHF帯における通信放送融合システムの一検討

    武田 尚久,*冨里 繁,秦 正治

    2004年電子情報通信学会ソサイエティ大会  2004 

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    Event date: 2004.9.23

    Venue:徳島  

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  • MIMOチャネル伝送用SC/Simplified-MMSE(SC/S-MMSE)型ターボ受信機

    藤井 啓正,*冨里 繁,須田 博人

    電子情報通信学会 無線通信システム研究会  2003 

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    Event date: 2003.7.18

    Venue:豊橋  

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  • フィードバック遅延を考慮した固有ビーム分割多重型MIMOチャネル伝送法

    山田武史, 阿部哲士, *冨里 繁, 須田博人

    電子情報通信学会総合大会  2003 

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    Event date: 2003.3.19 - 2003.3.22

    Venue:仙台  

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  • 最適電力配分を行う送信アンテナ選択型MIMOチャネル伝送方式

    時 慧, 阿部哲士, *冨里 繁, 須田博人

    電子情報通信学会総合大会  2003 

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    Event date: 2003.3.19 - 2003.3.22

    Venue:仙台  

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  • 周波数選択性チャネルにおけるE-SDMに関する検討

    古田敬幸, 大鐘武雄, 西村寿彦, 小川恭孝, *冨里 繁

    電子情報通信学会総合大会  2003 

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    Event date: 2003.3.19 - 2003.3.22

    Venue:仙台  

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  • フレーム内共通フィルタ係数を用いたSC/MMSE型MIMOターボ受信機

    藤井啓正, *冨里 繁, 須田博人

    電子情報通信学会総合大会  2003 

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    Event date: 2003.3.19 - 2003.3.22

    Venue:仙台  

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  • アングルスプレッドの距離特性に対するMIMOチャネルキャパシティ評価

    三浦裕子, 山田武史, *冨里 繁, 須田博人

    電子情報通信学会総合大会  2003 

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    Event date: 2003.3.19 - 2003.3.22

    Venue:仙台  

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  • パスダイバーシチ効果を考慮した時空等化器用シンボル同期法

    山田武史, *冨里 繁, 須田博人

    電子情報通信学会 ソサイエティ大会  2002 

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    Event date: 2002.9.10 - 2002.9.13

    Venue:宮崎  

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  • 検出シンボルの外部情報値を利用するMIMOターボ等化法

    藤井啓正, *冨里 繁, 須田博人

    電子情報通信学会 ソサイエティ大会  2002 

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    Event date: 2002.9.10 - 2002.9.13

    Venue:宮崎  

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  • 整合フィルタ近似を用いたSC/MMSE型時空MIMOターボ等化器に関する検討

    阿部哲士, 大森博雄, *冨里 繁

    電子情報通信学会総合大会  2002 

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    Event date: 2002.3.27 - 2002.3.30

    Venue:東京  

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  • 周波数選択性MIMOチャネルにおける時空ターボ等化器受信特性

    藤井啓正, 阿部哲士, *冨里 繁

    電子情報通信学会総合大会  2002 

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    Event date: 2002.3.27 - 2002.3.30

    Venue:東京  

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  • 広帯域移動通信用時空等化器シンボル同期タイミング検出法の検討

    山田武史, *冨里 繁

    電子情報通信学会総合大会  2002 

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    Event date: 2002.3.27 - 2002.3.30

    Venue:東京  

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  • 周波数選択性MIMOチャネルにおけるSC/MMSE型繰返し等化器

    浅井孝浩, *冨里 繁

    電子情報通信学会総合大会  2002 

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    Event date: 2002.3.27 - 2002.3.30

    Venue:東京  

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  • 移動通信用MIMOチャネル信号伝送における無線信号処理

    *冨里 繁,松本 正 浅井 孝浩

    電子情報通信学会 無線通信システム研究会  2001 

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    Event date: 2001.10.18 - 2001.10.20

    Venue:富山  

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  • 実伝搬データを用いたMIMOチャネル伝送用時空ターボ等化器の伝送特性評価

    藤井 啓正,阿部 哲士,*冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  2001 

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    Event date: 2001.10.18 - 2001.10.20

    Venue:富山  

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  • 実伝搬データを用いた分離処理型時空等化器受信特性評価

    山田 武史,*冨里 繁,松本 正

    電子情報通信学会ソサイエティ大会  2001 

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    Event date: 2001.9.18 - 2001.9.21

    Venue:調布  

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  • 多次元チャネルサウンディング測定データを用いた広帯域移動通信リンクレベル性能評価

    *冨里 繁,山田 武史,松本 正

    電子情報通信学会ソサイエティ大会  2001 

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    Event date: 2001.9.18 - 2001.9.21

    Venue:調布  

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  • 実伝搬データを用いた時空等化器システムレベルシミュレーション評価

    山田 武史,*冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  2001 

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    Event date: 2001.5.25 - 2001.5.26

    Venue:東京  

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  • 広帯域移動通信用分離処理型時空等化器の伝送特性

    *冨里 繁,松本 正

    電子情報通信学会総合大会  2001 

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    Event date: 2001.3.26 - 2001.3.29

    Venue:草津  

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  • 実伝搬データを用いた時空等化器最適設計法の検討

    山田 武史,*冨里 繁,松本 正

    電子情報通信学会総合大会  2001 

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    Event date: 2001.3.26 - 2001.3.29

    Venue:草津  

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  • 実伝搬データを用いた時空等化器のシステム評価

    山田 武史,*冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  2000 

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    Event date: 2000.10.12 - 2000.10.13

    Venue:新潟  

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  • 繰り返しトレーニングによる分離処理型時空等化器の受信特性改善効果

    *冨里 繁,松本 正

    電子情報通信学会ソサイエティ大会  2000 

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    Event date: 2000.9.30 - 2000.10.3

    Venue:名古屋  

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  • 実伝搬データに基づく移動通信用時空等化器受信特性評価

    山田 武史,*冨里 繁,松本 正

    電子情報通信学会ソサイエティ大会  2000 

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    Event date: 2000.9.30 - 2000.10.3

    Venue:名古屋  

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  • 実伝搬データを用いた時空等化器の伝送特性評価

    山田 武史,Uwe Trautwein,*冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  2000 

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    Event date: 2000.7.18 - 2000.7.19

    Venue:札幌  

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  • ビーム/ヌル同時ステアリング方式を用いた時空等化器の受信特性

    三木 信彦,浅井 孝浩,*冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  2000 

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    Event date: 2000.5.25 - 2000.5.26

    Venue:桐生  

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  • 移動通信用分離処理型時空等化器の伝送特性

    *冨里 繁,三木 信彦,松本 正

    電子情報通信学会 無線通信システム研究会  2000 

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    Event date: 2000.4.21

    Venue:静岡  

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  • 移動通信用分離処理型時空等化器の受信特性

    *冨里 繁,三木 信彦,松本 正

    電子情報通信学会総合大会  2000 

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    Event date: 2000.3.28 - 2000.3.31

    Venue:広島  

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  • ビーム/ヌル同時ステアリング型時空等化器による場所率改善効果

    三木 信彦,*冨里 繁,松本 正

    電子情報通信学会総合大会  2000 

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    Event date: 2000.3.28 - 2000.3.31

    Venue:広島  

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  • 高速伝送用メトリック合成型時間・空間ダイバーシチ適応等化器の構成と受信特性

    三木 信彦,川島 誠,冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  1999 

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    Event date: 1999.10.14 - 1999.10.15

    Venue:豊田  

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  • 移動通信時間/空間分離処理型時空等化器の受信特性

    *冨里 繁,三木 信彦,松本 正

    電子情報通信学会ソサイエティ大会  1999 

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    Event date: 1999.9.7 - 1999.9.10

    Venue:船橋  

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  • アダプティブアレーアンテナによる場所率改善効果 ?レイトレーシングを用いた推定?

    三木 信彦,*冨里 繁,松本 正

    電子情報通信学会ソサイエティ大会 

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    Event date: 1999.9.7 - 1999.9.10

    Venue:船橋  

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  • レイトレーシング法を用いたアダプティブアレーアンテナシステム場所率改善効果の推定

    三木 信彦,冨里 繁,松本 正

    電子情報通信学会 無線通信システム研究会  1999 

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    Event date: 1999.7.22 - 1999.7.23

    Venue:福井  

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  • TDD移動通信システムにおける時空プリイコライゼーションの受信特性

    *冨里 繁,府川 和彦,松本 正

    電子情報通信学会総合大会  1999 

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    Event date: 1999.3.25 - 1999.3.28

    Venue:横浜  

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  • メトリック合成型時間ダイバーシチ適応等化器の特性

    三木 信彦,*冨里 繁,松本 正

    電子情報通信学会総合大会  1999 

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    Event date: 1999.3.25 - 1999.3.28

    Venue:横浜  

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  • 適応等化特性に対する電力増幅器非線形歪の影響

    *冨里 繁,高嶋 一勝

    電子情報通信学会総合大会  1999 

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    Event date: 1999.3.25 - 1999.3.28

    Venue:横浜  

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  • A collaborative non-linear distortion compensation method in both transmitter and receiver

    2018 

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  • LED可視光通信の空間多重化における干渉特性評価

    平成30年度年電気・情報関連学会中国支部連合大会  2018 

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  • LED可視光通信用送受信機における非線形歪補償の検討

    電子情報通信学会短距離無線通信研究会  2018 

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  • 周波数共用システムにおけるマルチバンド使用時の システム間干渉評価

    電子情報通信学会スマート無線研究会  2018 

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  • LED可視光通信の非線形歪補償における受信機雑音の影響

    2018年電子情報通信学会総合大会  2018 

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  • Coverage Evaluation by Bandwidth Control in Spectral Sharing Multi-Band Systems

    2018 

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  • Coverage Improvement by Bandwidth Control in Multi-Band Systems

    2018 

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  • Interference Reduction Effect by Adaptive Bandwidth Control of Multi-Band Systems

    2018 

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  • 蓄積一括信号処理による信号分離における 最適窓関数選択方法の一検討

    平成30年度年電気・情報関連学会中国支部連合大会  2018 

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  • 地下構造物の電波伝搬モデリングに関する実験と計算による検討

    The 20th IEEE Hiroshima Student Symposium  2018 

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  • LED可視光無線通信の空間的多重化における干渉特性の検討

    The 20th IEEE Hiroshima Student Symposium  2018 

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  • 可視光無線通信用LEDにおけるバックオフ最適化の検討

    2017年電子情報通信学会ソサイエティ大会  2017 

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  • A Non-Linear Distortion Compensation Method in a Receiver of LED Visible Light Communications

    2017 

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  • マルチバンド方式における非線形歪雑音電力制御による 伝送効率改善効果

    電子情報通信学会スマート無線研究会  2017 

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  • 可視光通信におけるLEDの飽和制御による受信特性改善効果

    電子情報通信学会短距離無線通信研究会  2017 

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  • 可視光通信におけるLED線形化による受信特性改善効果

    2017年電子情報通信学会総合大会  2017 

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  • LEDの飽和領域を利用する可視光通信の受信特性

    電子情報通信学会短距離無線通信研究会  2017 

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  • Performance Evaluation by Non-Linear Factor Error in a Distortion Compensation Method

    2017 

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  • A Reception Performance Improvement Method of Multi-Band Frequency Sharing Systems

    2017 

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  • A Non-Linear Distortion Compensation Method in a Receiver for LEDs of Visible Light Communications

    2017 

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  • Reception characteristic of Multi-Band Frequency Sharing Systems Using Bandwidth Control

    2017 

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  • マルチバンド方式における非線形歪雑音電力制御による干渉低減効果

    電子情報通信学会スマート無線研究会  2016 

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  • 可視光通信用LEDの非線形歪による伝送特性劣化とその改善手法

    平成28年度年電気・情報関連学会中国支部連合大会  2016 

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  • 可視光通信用LEDの線形化における入力電力制限の影響評価

    2016年電子情報通信学会ソサイエティ大会  2016 

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  • Out-of-Band Noise Reduction Effect of Noise Control Signals in Multi-Band Systems

    2016 

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  • Noise Reduction Effect of Out-of-Band Noise Control Signals in Multi-Band Systems

    2016 

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  • 可視光通信用LEDにおけるプリディストーションによる非線形性の改善

    The 18th IEEE Hiroshima Student Symposium  2016 

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  • 傾斜地エリアに対する伝搬損失補正式の適用性の比較検討-岡山と小倉の場合-

    The 15th IEEE Hiroshima Student Symposium  2013 

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  • 中山間地域におけるBWAシステムの実証実験-無線回線設計-

    2008年電子情報通信学会ソサイエティ大会  2008 

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  • アダプティブアレーアンテナによる場所率改善効果 -レイトレーシングを用いた推定-

    電子情報通信学会ソサイエティ大会  1999 

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Awards

  • ICETC2021 Student Presentation Award

    2021.12  

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  • 電子情報通信学会中国支部連合大会奨励賞

    2021.11   電子情報通信学会  

    日笠 颯汰

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  • IEEE広島支部学生シンポジウム最優秀研究賞

    2021.11   IEEE広島支部  

    得居 紀宏

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2020.11   IEEE広島支部  

    福山 豪

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2020.11   IEEE広島支部  

    岡田 航

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2020.11   IEEE広島支部  

    灰野 寛大

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2019.11   IEEE広島支部  

    平井啓太郎

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2019.11   IEEE広島支部  

    高松直登

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2019.11   IEEE広島支部  

    西山 徹

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  • 電子情報通信学会中国支部連合大会奨励賞

    2019.10   電子情報通信学会  

    高松 直登

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  • 2019年度通信ソサイエティ活動功労賞

    2019.9   電子情報通信学会  

    冨里 繁

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  • IEEE広島支部学生シンポジウム最優秀プレゼンテーション賞

    2018.11   IEEE広島支部  

    亀井裕典

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  • 電子情報通信学会短距離無線通信研究会優秀学生賞

    2017  

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    Country:Japan

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  • 電子情報通信学会中国支部連合大会奨励賞

    2017  

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    Country:Japan

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2017  

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    Country:Japan

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  • 電子情報通信学会中国支部連合大会奨励賞

    2016  

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    Country:Japan

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  • 電子情報通信学会中国支部連合大会奨励賞

    2015  

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    Country:Japan

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  • IEEE広島支部学生シンポジウム優秀研究賞

    2015  

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    Country:Japan

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  • 平成25年度通信ソサイエティ活動功労賞

    2013  

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    Country:Japan

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  • 平成23年度通信ソサイエティ活動功労賞

    2011  

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    Country:Japan

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  • 平成22年度通信ソサイエティ活動功労賞

    2010  

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    Country:Japan

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  • 平成18年度通信ソサイエティ活動功労賞

    2006  

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  • WPMC''03 Excellent Paper Award

    2003  

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    Country:Japan

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  • WPMC''03 Excellent Paper Award

    2003  

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  • 電子情報通信学会学術奨励賞

    1998  

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    Country:Japan

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  • Spread Spectrum Communications (2021academic year) Prophase  - 月3,月4

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  • Specific Research of Electronics and Information Systems Engineering (2020academic year) Year-round  - その他

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