2021/06/15 更新

写真a

コウ アヒ
侯 亜飛
HOU Yafei
所属
自然科学学域 助教
職名
助教
外部リンク

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 通信工学  / MIMOシステム、機器学習、位置推定、5G・6G、次世代デジタルTVシステム

学歴

  • 復旦大学   Graduate School of Comuputer Science  

    2002年9月 - 2007年7月

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  • 高知工科大学   基盤工学研究科  

    2004年4月 - 2007年3月

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経歴

  • 岡山大学   大学院自然科学研究科   助教

    2017年4月 - 現在

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  • 株式会社国際電気通信基礎技術研究所   波動工学研究所   客員研究員

    2014年4月 - 2021年3月

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  • 奈良先端科学技術大学院大学   情報科学領域   助教

    2014年4月 - 2017年3月

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  • 株式会社国際電気通信基礎技術研究所   波動工学研究所   専任研究員

    2010年10月 - 2014年3月

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  • 龍谷大学   情報通信システム研究センター   博士研究員

    2007年8月 - 2010年9月

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論文

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

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

    APSIPA TRANSACTIONS ON SIGNAL AND INFORMATION PROCESSING9   2020年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CAMBRIDGE UNIV PRESS  

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

    DOI: 10.1017/ATSIP.2020.18

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

    Yafei Hou, Junjie Zhu, Satoshi Denno, Minoru Okada

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY68 ( 11 ) 11042 - 11051   2019年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Leaky coaxial cable (LCX) is applied broadly for many application scenarios because it can be utilized as antenna for user localization, wireless power transfer (WPT) and wireless coverage. Usually, one LCX can be used as one antenna, and therefore more cables are required for the configuration of an multiple-input and multiple-output (MIMO) system. This paper will provide a simple design that a 4-by-4 MIMO channel can be realized with one composite cable. Therefore the proposal can release the space limitation for MIMO deployment. The results show that, over 5 GHz frequency band, even though the distance between two V-type LCXs is 2 cm, the proposed 4-by-4 LCX-MIMO can have good channel condition which ensures the proposed composite cable can be made as a finer one. In addition, using user's position information (PI), we propose a simple power allocation scheme for the proposed LCX-MIMO system. Compared with the allocation method of equal power, the proposed method using PI can largely improve its capacity with the same level of computational complexity and without requirement of the feedback of channel status information (CSI).

    DOI: 10.1109/TVT.2019.2942945

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  • Capacity Evaluation of MIMO Channel With One Leaky Coaxial Cable Used as Two Antennas Over Linear-Cell Environments 査読

    Yafei Hou, Satoshi Tsukamoto, Sha Li, Takeshi Higashino, Kiyoshi Kobayashi, Minoru Okada

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY66 ( 6 ) 4636 - 4646   2017年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Leaky coaxial (LCX) cable is widely used in wireless communication systems as an antenna, especially for a long and narrow area called the linear-cell environment. The general usage of LCX cable is that it can be treated as one antenna. To configure a multiple-input-multiple-output (MIMO) system, it requires more than one LCX cable. In this paper, we propose a simple design in which one single LCX cable can be used as two antennas. Therefore, the proposal reduces the cost and spacing requirement and releases the space requirement of MIMO deployment for wireless application over linear-cell environments. We will study the capacity of the proposed LCX-MIMO system using equal power (EP) allocation and water-filling power allocation and compare its capacity with the conventional MIMO system using monopole antennas. The capacity results over the 2.4 GHz band and the 5 GHz band show that the proposed LCX-MIMO channel has better capacity than that of using monopole antennas over linear-cell environments. In particular, it can achieve more capacity improvement than that of channel using monopole antennas with the simple EP allocation. The throughput experiments over 5 GHz also show that our proposal can achieve the higher and stable throughput over the radiation coverage of LCX cable.

    DOI: 10.1109/TVT.2016.2612683

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  • Modeling and Predictability Analysis on Channel Spectrum Status over Heavy Wireless LAN Traffic Environment 査読

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

    IEEE Access9   1 - 18   2021年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/access.2021.3088123

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

    Yafei Hou, Satoshi Denno

    IEEE Transactions on Broadcasting67 ( 1 ) 324 - 336   2021年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tbc.2020.2977514

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

    Yafei Hou, Rian Ferdian, Satoshi Denno, Minoru Okada

    IEEE Transactions on Broadcasting67 ( 1 ) 238 - 252   2021年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tbc.2020.3039679

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

    Junjie Zhu, Yafei Hou, Kenta Nagayama, Satoshi Denno

    IEEE Access9   15929 - 15938   2021年1月

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    添付ファイル: 09328758 (1).pdf

    DOI: 10.1109/access.2021.3053034

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  • Matrix Factorization-Based RSS Interpolation for Radio Environment Prediction 査読

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

    IEEE Wireless Communications Letters   1 - 5   2021年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/lwc.2021.3069979

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

    Yafei Hou, Naoya Hokimoto, Satoshi Denno

    International Journal of Computer & Software Engineering5 ( 2 ) 1 - 9   2020年12月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Graphyonline Publications PVT, Ltd.  

    DOI: 10.15344/2456-4451/2020/159

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  • A polarization- and angle-insensitive broadband tunable metamaterial absorber using patterned graphene resonators in the terahertz band 査読

    Xuemei Du, Fengping Yan, Wei Wang, Siyu Tan, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    OPTICS AND LASER TECHNOLOGY132   2020年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The emerging material of graphene has resulted in new options for the design of metamaterial devices with excellent performances, offering an attractive platform for electromagnetic absorption applications. To date, researches on patterned graphene-based metamaterial absorbers (MAs), have focused on achieving broadband absorption while maintaining many excellent properties. Here, we propose a broadband tunable MA with a perfect absorption based on a novel design of the combination of cross- and square-shaped graphene sheets. Numerical simulation results show that the bandwidth of the proposed broadband MA reaches 2.76 THz with the absorptivity greater than 90% for both the transverse electric (TE) and transverse magnetic (TM) modes, which exceeds most of broadband absorption results achieved by MAs in previous studies. A numerical analysis em ploying the equivalent circuit model for the designed structure is conducted to determine the influence of the structural parameters on the absorptivity and optimize the parameters. Results show that impedance matching is achieved between the input impedance and the free-space impedance at the absorption band. Detailed numerical simulations are conducted to calculate the surface loss density, electric field, and surface currents to obtain an understanding of the high absorption mechanism. Also, the designed MA exhibits excellent properties, such as tunability, polarization independence, incident angle insensitivity and outstanding tolerance to changes in the structural parameters, suggesting that the proposed absorber is a promising candidate for various applications in the terahertz band.

    DOI: 10.1016/j.optlastec.2020.106513

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  • An SMLB-based OFDM receiver over impulsive noise environment 査読

    Chengbo Liu, Na Chen, Minoru Okada, Yafei Hou

    APSIPA Transactions on Signal and Information Processing9   2020年11月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cambridge University Press (CUP)  

    The impulsive noise (IN) damages the performance of wireless communication in modern 5G scenarios such as manufacturing and automatic factories. The proposed receiver utilizes constant false alarm rate to obtain the threshold and combines with blanking to further improve the performance of the conventional blanking scheme with acceptable complexity. The simulated results show that the proposed receiver can achieve a lower bit error rate even if the probability of IN occurrence is very high and the power of the IN is much larger than that of the background noise.

    DOI: 10.1017/atsip.2020.22

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

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

    IEICE TRANSACTIONS ON COMMUNICATIONSE103B ( 5 ) 600 - 608   2020年5月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes a low complexity soft input decoding in an iterative linear receiver for overloaded MIMO. The proposed soft input decoding applies two types of lattice reduction-aided linear filters to estimate log-likelihood ratio (LLR) in order to reduce the computational complexity. A lattice reduction-aided linear with whitening filter is introduced for the LLR estimation in the proposed decoding. The equivalent noise caused by the linear filter is mitigated with the decoder output stream and the LLR is re-estimated after the equivalent noise mitigation. Furthermore, LLR clipping is introduced in the proposed decoding to avoid the performance degradation due to the incorrect LLRs. The performance of the proposed decoding is evaluated by computer simulation. The proposed decoding achieves about 2 dB better BER performance than soft decoding with the exhaustive search algorithm, so called the MLD, at the BER of 10(-4), even though the complexity of the proposed decoding is 1/10 as small as that of soft decoding with the exhaustive search.

    DOI: 10.1587/transcom.2019EBP3159

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  • Enhancing sensing capacity of terahertz metamaterial absorbers with a surface-relief design 査読

    Wei Wang, Fengping Yan, Siyu Tan, Haisu Li, Xuemei Du, Luna Zhang, Zhuoya Bai, Dan Cheng, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH8 ( 4 ) 519 - 527   2020年4月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OPTICAL SOC AMER  

    Metamaterial absorbers (MAs) serve as important electromagnetic wave-absorbing devices that have captured the attention of researchers for a long term. Functioning as sensitive detectors to determine perturbations in an ambient environment is another significant subsidiary function. Here, we theoretically propose an optimized fabrication method to implement terahertz MAs with fewer steps and also evaluate both absorption and sensing performances of such MAs realized by the new method. Simulation findings demonstrate that such MAs can basically maintain the original absorption features perfectly, including near-complete absorption at resonance as well as strong robustness to wide incident angles. Specifically, the full width at half-maximum and quality factor of the absorption resonances attenuate less than 26% and 8% with this new method, remaining in the ranges of similar to 0.03-0.04 THz and similar to 20-27 for two selected example MAs. More significantly, sensing capacities of this type of MA, in terms of maximum detection range (enhancing at least 9%), observable spectral modulation (increasing at least 6.3%), and refractive index sensitivity, are improved to a large extent because of more intense coupling between resonant field and matter in the case of surface-relief MAs. This stronger coupling results from exposing more spots of the resonantly high field to direct contact with an approaching analyte, which is illustrated by field profiles of the MAs at resonance in this work. Additionally, other desirable absorber features are also explored with such MAs, like functioning as building blocks to configure multiband MAs and strong robustness against fabrication errors. Such new-style terahertz MAs shown in the paper, acting as good examples, not only prove that terahertz MAs can be fabricated by the proposed time- and cost-saving route in contrast to the traditional MA fabrication process, but also can serve as novel platforms to explore other intriguing terahertz photonic effects, such as the field enhancement effect. (C) 2020 Chinese Laser Press

    DOI: 10.1364/PRJ.386040

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

    Yafei Hou, Shun Kawasaki, Satoshi Denno

        202 - 203   2020年

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/LifeTech48969.2020.1570619143

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    その他リンク: https://dblp.uni-trier.de/db/conf/lifetech/lifetech2020.html#HouKD20

  • Estimation of Probability Density Function Using Multi-bandwidth Kernel Density Estimation for Throughput. 査読

    Norisato Suga, Kazuto Yano, Julian Webber, Yafei Hou, Toshihide Higashimori, Yoshinori Suzuki

        171 - 176   2020年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ICAIIC48513.2020.9065033

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    その他リンク: https://dblp.uni-trier.de/db/conf/icaiic/icaiic2020.html#SugaYWHHS20

  • Symmetry Breaking and Resonances Hybridization in Vertical Split Ring Resonator Metamaterials and the Excellent Sensing Potential 査読

    Wei Wang, Fengping Yan, Siyu Tan, Haisu Li, Xuemei Du, Luna Zhang, Zhuoya Bai, Dan Cheng, Hong Zhou, Yafei Hou

    IEEE/OSA Journal of Lightwave Technology37 ( 19 ) 5149 - 5157   2019年10月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The resonances with narrow linewidths generated in metamaterials are valuable for numerous applications ranging from bio-sensing to narrow-band filter. And breaking structural symmetry of metamaterials is one of the common and efficient approaches to achieve such sharp resonances. In this paper, we present symmetry breaking introduced in vertical split ring resonators (VSRR) metamaterials to excite narrow resonance. Different from the previously reported planar asymmetric metamaterials, the three-dimensional metamaterials are dominantly excited by the magnetic field component of the terahertz illumination together with the electric component. In this case, sharp resonances with characteristic magnetic field distributions are excited. And the sharpest resonance shows up with an ultra-narrow line-width (full width at half maximum, FWHM is 5.90 GHz) and high Q of 327 at 1.93 THz. Through systematic theoretical analysis and numerical mode implementation, we reveal the sharp resonance dips are produced by resonance hybridization between a resonance mode induced by the destruction of the structural symmetry and another special resonance inherent in the symmetric VSRR metamaterials. In addition, the fabrication robustness and sensing potential of the asymmetric VSRR metamaterials are explored in this paper. The results show that the AVSRR design is insensitive to the errors in the fabrication process, like rough metal surface and smoothmetal corner, but highly sensitive to the approaching substance, which prove the excellent sensing performance.

    DOI: 10.1109/JLT.2019.2929771

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

    Satoshi Denno, Yuto Nagai, Yafei Hou

    IEICE TRANSACTIONS ON COMMUNICATIONSE102B ( 10 ) 2073 - 2081   2019年10月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes an XOR physical layer network coding (XOR-PLNC) with non-linear precoding for quadrature amplitude modulations (QAMs) in bi-directional MIMO relay systems. The proposed XOR-PLNC applies power loading in order to improve the transmission performance. The proposed XOR-PLNC introduces a modulus adapted to channel gains. Moreover, the modulus is further reduced in cooperation with modulo operation which the non-linear precoding employs for improvement of transmission power efficiency. The use of the reduced modulus improves the energy efficiency of the signal transmission, which improves the transmission performance in the proposed XOR-PLNC. The performance is evaluated by computer simulations in bi-directional MIMO relay channels with 16QAM to 1024QAM.

    DOI: 10.1587/transcom.2018EBP3346

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    その他リンク: https://dblp.uni-trier.de/db/journals/ieicet/ieicet102b.html#DennoNH19

  • Numerical Analysis of Magnetic Plasmonic Resonance Modes in Three-Dimension Split Ring Resonator Metamaterials 査読

    Wei Wang, Feng-Ping Yan, Si-Yu Tan, Hai-Su Li, Xue-Mei Du, Hong Zhou, Yafei Hou

    IEEE Photonics Journal11 ( 4 ) 1 - 10   2019年8月

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    担当区分:最終著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/jphot.2019.2917539

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

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Yafei Hou

    IEICE TRANSACTIONS ON COMMUNICATIONSE102B ( 5 ) 1045 - 1054   2019年5月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes a novel low complexity lattice reduction-aided iterative receiver for overloaded MIMO. Novel noise cancellation is proposed that increases an equivalent channel gain with a scalar gain introduced in this paper, which results in the improvement of the signal to noise power ratio (SNR). We theoretically analyze the performance of the proposed receiver that the lattice reduction raises the SNR of the detector output signals as the scalar gain increases, when the LenstraLenstra- Lova's (LLL) algorithm is applied to implement the lattice reduction. Because the SNR improvement causes the scalar gain to increase, the performance is improved by iterating the reception process. Computer simulations confirm the performance. The proposed receiver attains a gain of about 5 dB at the BER of 10(-4) in a 6 x 2 overloaded MIMO channel. Computational complexity of the proposed receiver is about 1/50 as much as that of the maximum likelihood detection (MLD).

    DOI: 10.1587/transcom.2018EBP3215

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    その他リンク: https://dblp.uni-trier.de/db/journals/ieicet/ieicet102b.html#DennoKIH19

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

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

        1002 - 1003   2019年

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    担当区分:責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/GCCE46687.2019.9015621

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    その他リンク: https://dblp.uni-trier.de/db/conf/gcce/gcce2019.html#ZhuHDO19

  • Prediction of QoS Outage Probability for Wireless Communication in Factory Environments. 査読

    Norisato Suga, Kazuto Yano, Julian Webber, Yafei Hou, Toshihide Higashimori, Yoshinori Suzuki

        124 - 129   2019年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/IINTEC48298.2019.9112098

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    その他リンク: https://dblp.uni-trier.de/db/conf/iintec/iintec2019.html#SugaYWHHS19

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

    Satoshi Denno, Tsubasa Inoue, Takuya Fujiwara, Yafei Hou

        1 - 5   2019年

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    担当区分:最終著者   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/VTCFall.2019.8891589

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    その他リンク: https://dblp.uni-trier.de/db/conf/vtc/vtc2019f.html#DennoIFH19

  • Low Density Signature based Packet Access with Phase Only Adaptive Precoding 査読

    Satoshi Denno, Ryoko Sasaki, Yafei Hou

    2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING)   1 - 5   2019年

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a low density signature-based packet access with phase only adaptive precoding. The proposed access allows multiple user terminals to send their packets simultaneously though only one antenna is put on terminals and on an access point, in order to increase network throughput. The proposed phase only adaptive precoding improves the transmission performance by rotating the transmission signal phase. This paper proposes a criterion that defines the optimum rotation angle, and actual two techniques to estimate the angle. When 6 packets are transmitted in 4 time slots, the proposed adaptive precoding attains about a gain of 4dB at the BER of 10(-4) in a single input single output Rician fading channel, i.e., overloading ratio is 1.5.

    DOI: 10.1109/VTCSpring.2019.8746451

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    その他リンク: https://dblp.uni-trier.de/db/conf/vtc/vtc2019s.html#DennoSH19

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

    Satoshi Denno, Kazuma Yamamoto, Yafei Hou

        1 - 6   2019年

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    担当区分:最終著者   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/WPMC48795.2019.9096064

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    その他リンク: https://dblp.uni-trier.de/db/conf/wpmc/wpmc2019.html#DennoYH19

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

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

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

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    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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  • Machine Learning-based RSSI Prediction in Factory Environments. 査読

    Julian Webber, Norisato Suga, Susumu Ano, Yafei Hou, Abolfazl Mehbodniya, Toshihide Higashimori, Kazuto Yano, Yoshinori Suzuki

        195 - 200   2019年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/APCC47188.2019.9026476

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  • Time-Domain Signal Recovery for OFDM System in the Industrial Environment 査読

    Chengbo Liu, Na Chen, Yafei Hou, Minoru Okada

    2019 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1847 - 1851   2019年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper will utilize a method to recover the damaged time-domain signal of the OFDM system over the WLAN channel in the industrial environment. We assume that the channel is perfectly detected. The simulated results show that the OFDM system using M-algorithm can achieve better BER performance compared to that of the conventional OFDM system in the AWGN channel when 1/2 time-domain signal is missing. On the other hand, the BER performance of the OFDM system with M-algorithm using ZF is better than that of the conventional OFDM system when 1/4 and 1/2 time-domain signal is missing in the WLAN channel. In addition, the BER performance of the OFDM system with M-algorithm using MMSE is better than that of the OFDM system with M-algorithm using ZF in the WLAN channel when 1/8, 1/4 and 1/2 time-domain signal is missing.

    DOI: 10.1109/APSIPAASC47483.2019.9023219

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    その他リンク: https://dblp.uni-trier.de/db/conf/apsipa/apsipa2019.html#LiuCHO19

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

    Kazuma Yamamoto, Satoshi Denno, Yafei Hou

    2019 IEEE VTS ASIA PACIFIC WIRELESS COMMUNICATIONS SYMPOSIUM (APWCS 2019)   1 - 5   2019年

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    XOR-physical layer network coding is known to achieve superior performance in terms of an end-to-end throughput and frequency utilization efficiency. This paper proposes a novel relay selection technique to further improve transmission performance. We introduce a relay selection criteria that is defined as an end-to-end BER performance in the relay network. The proposed technique select a group of relays that maximizes the criteria. This paper applies lattice reduction-aided precoding in order to improve the transmission performance and to reduce computational complexity of the relay selection. The performance of the proposed relay selection is evaluated in a 2x2 MIMO bidirectional wireless relay system. The proposed selection attains a gain of about 13dB at the BER of 10(-4).

    DOI: 10.1109/VTS-APWCS.2019.8851618

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    その他リンク: https://dblp.uni-trier.de/db/conf/apwcs2/apwcs2019.html#YamamotoDH19

  • Ultrasensitive sensing with three-dimensional terahertz metamaterial absorber 査読

    Siyu Tan, Fengping Yan, Wei Wang, Hong Zhou, Yafei Hou

    JOURNAL OF OPTICS20 ( 5 )   2018年5月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Planar metasurfaces and metamaterial absorbers have shown great promise for label-free sensing applications at microwaves, optical and terahertz frequencies. The realization of high-qualityfactor resonance in these structures is of significant interest to enhance the sensing sensitivities to detect minute frequency shifts. We propose and demonstrate in this manuscript an ultrasensitive terahertz metamaterial absorber sensor based on a three-dimensional split ring resonator absorber with a high quality factor of 60.09. The sensing performance of the proposed absorber sensor was systematically investigated through detailed numerical calculations and a maximum refractive index sensitivity of 34.40% RIU-1 was obtained. Furthermore, the absorber sensor can maintain a high sensitivity for a wide range of incidence angles up to 60 degrees under TM polarization incidence. These findings would improve the design flexibility of the absorber sensors and further open up new avenues to achieve ultrasensitive sensing in the terahertz regime.

    DOI: 10.1088/2040-8986/aab66e

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  • Safeguarding 5G Networks through Physical Layer Security Technologies 査読

    Li Sun, Kamel Tourki, Yafei Hou, Lu Wei

    WIRELESS COMMUNICATIONS & MOBILE COMPUTING2018   7503735 - 2   2018年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-HINDAWI  

    DOI: 10.1155/2018/7503735

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  • Busy/Idle Duration Model for WLAN Traffic and Its Prediction Performance using Autoregressive Method 査読

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

    2018 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS (APMC)   893 - 895   2018年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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

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  • Partial Layered Division Multiplexing with STBC for ISDB-T and Next Generation DTTB Systems 査読

    Ryan Paderna, Yafei Hou, Duong Quang Thang, Takeshi Higashino, Minoru Okada

    ITE TRANSACTIONS ON MEDIA TECHNOLOGY AND APPLICATIONS6 ( 1 ) 98 - 109   2018年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST IMAGE INFORMATION & TELEVISION ENGINEERS  

    In order to realize next generation digital terrestrial television broadcasting (DTTB) systems, the currently deployed Integrated Services Digital Broadcasting Terrestrial (ISDB-T) is still essential due to the spectrum-scarcity. This paper proposes a layered division multiplexing (LDM) scheme to simultaneously transmit ISDB-T stream and a secondary data stream over a common frequency band. The next generation DTTB system can be obtained by combining the ISDB-T and the secondary data streams. In the proposed scheme, we deploy the primary layer for transmission of ISDB-T signal and the secondary layer for transmission of secondary data stream both employed space time block coding. In addition, we only adopt partial LDM to reduce the interference between two systems, since the transmission capacity of the secondary layer exceeded the minimum requirement due to reuse of primary layer.

    DOI: 10.3169/mta.6.98

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

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

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

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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

    DOI: 10.1109/GCCE.2018.8574729

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    その他リンク: https://dblp.uni-trier.de/db/conf/gcce/gcce2018.html#ZhuHDO18

  • Performance Analysis of Low complexity Lattice Reduction-aided Iterative Receiver for Overloaded MIMO 査読

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Hou Yafei

    2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   1 - 5   2018年

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a novel low complexity lattice reduction-aided iterative receiver for overloaded MIMO. Novel noise cancellation is proposed that increases an equivalent channel gain with a scalar gain introduced in this paper, which results in the improvement of the signal to noise power ratio (SNR). The performance of the proposed receiver is theoretically analyzed that the lattice reduction guarantees the SNR of the detector to be more than a value proportional to the scalar gain, when the LenstraLenstraLovas (LLL) algorithm is applied to implement the lattice reduction. The proposed receiver attains a gain of about 5dB at the BER of 10(-4) in a 6 x 2 overloaded MIMO channel.

    DOI: 10.1109/ICSPCS.2018.8631747

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    その他リンク: https://dblp.uni-trier.de/db/conf/icspcs/icspcs2018.html#DennoKIH18

  • Adaptive Sideband Selection for Periodic Interference Cancellation 査読

    Yuya Kimura, Satoshi Denno, Yafei Hou

    2018 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS (APMC)   156 - 158   2018年

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes adaptive sideband selection for periodic interference cancellation using digital signal processing. The proposed selection enables the periodic interference cancellation to attain better performance by providing sideband signals having higher ICNR(interference to carrier and noise power ratio). An algorithm that selects such sideband signals is shown in this paper. The proposed selection achieves 18dB better SINR(output signal to interference and noise power ratio) performance than random selection in the channel with CIR(carrier to interference power ratio) of 10dB and CNR(carrier to noise power ratio) of 30dB.

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  • Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators 査読

    Wei Wang, Fengping Yan, Siyu Tan, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH5 ( 6 ) 571 - 577   2017年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OPTICAL SOC AMER  

    An ultrasensitive metamaterial sensor based on double- slot vertical split ring resonators (DVSRRs) is designed and numerically calculated in the terahertz frequency. This DVSRR design produces a fundament LC resonance with a quality factor of about 20 when the incidence magnetic field component normal to the DVSRR array. The resonant characteristics and sensing performance of the DVSRR array design are systematically analyzed employing a contrast method among three similar vertical split ring resonator (SRRs) structures. The research results show that the elimination of bianisotropy, induced by the structural symmetry of the DVSRR design, helps to achieve LC resonance of a high quality factor. Lifting the SRRs up from the substrate sharply reduces the dielectric loss introduced by the substrate. All these factors jointly result in superior sensitivity of the DVSRR to the attributes of analytes. The maximum refractive index sensitivity is 788 GHz/RIU or 1.04 x 10(5) nm/RIU. Also, the DVSRR sensor maintains its superior sensing performance for fabrication tolerance ranging from -4% to 4% and wide range incidence angles up to 50 degrees under both TE and TM illuminations. (C) 2017 Chinese Laser Press

    DOI: 10.1364/PRJ.5.000571

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  • Research on transmission characteristics of phase-shifted CFBG in 2 mu m band 査読

    Luna Zhang, Fengping Yan, Zhuoya Bai, Yan Bai, Shuo Liu, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL FIBER TECHNOLOGY36   428 - 437   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Principles of single-and multi-phase-shifted chirped fiber Bragg grating (CFBG) in 2 mu m band are analyzed with transmission matrix method, and transmission characteristics, including transmissivity, wavelength and bandwidth performance, of single-and multi-phase-shifted CFBG in 2 mu m band with different grating parameters are discussed by simulation. It is found that phase-shifted position, grating length, chirped coefficient and refractive index modulation amplitude all have impacts on bandwidth of phase-shifted transmission peak. The transmission peak bandwidths of single-, dual-and tri-phase-shifted CFBG can reach to 0.0270, 0.0172 and 0.0112 nm respectively. The experiment of phase-shifted CFBG verifies the correctness of the simulation, and the bandwidths of 0.0901 and 0.0480 nm are acquired for single-and dual-phase-shifted CFBG respectively, which are narrower than previous filters based on fiber Bragg grating in 2 mu m band multi-wavelength fiber laser system. (C) 2017 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.yofte.2017.06.001

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  • 2-mu m numerical analysis of linear-cavity FP structures based on fiber Bragg gratings 査読

    Zhuoya Bai, Fengping Yan, Luna Zhang, Yan Bai, Shuo Liu, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL ENGINEERING56 ( 5 )   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS  

    The linewidth performance of all-fiber, linear-cavity Fabry-Perot structures based on fiber Bragg gratings operating at 2-mu m band has been investigated numerically. The output linewidth performance of two symmetrical and asymmetrical cavities has been theoretically studied and comprehensively compared. The numerical analysis is based on the transmission matrix method with the simplified parameters. The simulation results show that cavity lengths, cavity lengths ratio, grating lengths, grating lengths ratio, as well as index modulation depths, affect the output linewidth performance. The tolerance ability of the asymmetrical structure is first proposed and investigated under 1 mm accuracy, and single-frequency output can be realized by properly adjusting the properties of the proposed composite linear cavity structure. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)

    DOI: 10.1117/1.OE.56.5.056107

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  • Single-polarization noise-like pulse generation from a hybrid mode-locked thulium-doped fiber laser 査読

    Shuo Liu, Feng-Ping Yan, Ting Feng, Lu-Na Zhang, Zhuo-Ya Bai, Hong Zhou, Yafei Hou, Ning Zhang

    JOURNAL OF OPTICS19 ( 4 )   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    A hybrid mode-locked thulium-doped fiber laser incorporating a nonlinear optical loop mirror and a nonlinear polarization rotation effect is proposed in the 2 mu m band for the first time. By adjusting two polarization controllers, a stable single-polarization noise-like (SPNL) pulse operation is obtained. The SPNL pulse could work steadily for at least 400 min. At a launched pump power of 3.52 W, the hybrid mode-locked SPNL pulse centers at 2007 nm with an optical full width at half maximum of 20 nm, a polarization extinction ratio of 26.3 dB, a coherence spike width of 258 fs and a pulse energy of 42.11 nJ, respectively.

    DOI: 10.1088/2040-8986/aa6267

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  • Switchable SP Dual-Wavelength Mode-Locked TDFL Incorporating a PM-FBG and SESAM 査読

    Shuo Liu, Fengping Yan, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou, Ning Zhang

    IEEE PHOTONICS TECHNOLOGY LETTERS29 ( 6 ) 551 - 554   2017年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    A switchable single-polarization (SP) dualwavelength mode-locked thulium-doped fiber laser using the polarization maintaining fiber Bragg grating and semiconductor saturable absorber mirror is proposed in 2-mu m band. By adjusting the polarization controller, stable dual-wavelength pulse lasing operation and SP single-wavelength pulse lasing operation are obtained. The dual-wavelength pulse lasing operation is obtained at 1940.97 and 1941.73 nm. In the SP single-wavelength pulse lasing state, the polarization extinction ratios are higher than 30 dB, the SP pulse duration are 3.75 and 3.73 ps.

    DOI: 10.1109/LPT.2017.2669210

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  • Low-Complexity Compressed Sensing-Based Channel Estimation With Virtual Oversampling for Digital Terrestrial Television Broadcasting 査読

    Ryan Paderna, Duong Quang Thang, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEEE TRANSACTIONS ON BROADCASTING63 ( 1 ) 82 - 91   2017年3月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes a low-complexity compressed sensing (CS)-based time domain channel estimation with virtual oversampling for OFDM-based DTTB system. CS technique is first applied to sparse channel estimation in integrated services digital broadcasting-terrestrial (ISDB-T) system. Unfortunately, the CS-based time-domain channel estimation suffers from a performance degradation under the existence of fractional delay. Fractional delay is a common issue in time domain-based channel estimation due to sampling imperfection of channel delay time. Therefore, we propose virtual oversampling to deal with the fractional delay without increasing the signal bandwidth. Furthermore, exploiting the fact that the rate of change of path delay is slower than the path gain, a modified orthogonal matching pursuit is also proposed to reduce computational complexity. Numerical analyses of bit error rate and computational complexity are given to verify effectiveness of the proposed scheme.

    DOI: 10.1109/TBC.2016.2606938

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  • A Low-Complexity Hardware Implementation of Compressed Sensing-Based Channel Estimation for ISDB-T System 査読

    Rian Ferdian, Yafei Hou, Minoru Okada

    IEEE TRANSACTIONS ON BROADCASTING63 ( 1 ) 92 - 102   2017年3月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Compressed sensing (CS) is one of the hottest research topics in the sparse signal reconstruction problem. But CS implementation has a drawback of high computational complexity due to calculation between large size of matrices. In this paper, we will propose a low-complexity CS hardware realization for channel estimation in the integrated services digital broadcasting-terrestrial (ISDB-T) system using several optimization methods to reduce the implementation complexity of CS usage. Since the ISDB-T is based on orthogonal frequency division and multiplexing system, the measurement matrix of CS computation is a truncated discrete Fourier transform (DFT) matrix. We can exploit the symmetrical property of this DFT matrix to significantly reduce its multiplication complexity and random access memory usage. To achieve fast reconstruction period, this paper also provides a hardware architecture for the proposed method and its realization in field programmable gate array. The simulation results show that the proposed methods can achieve lower complexity CS-based channel estimation with almost the identical system performance with the conventional method. Moreover, the realized hardware can achieve the fastest execution time compare to that of other existing methods.

    DOI: 10.1109/TBC.2016.2617286

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  • Stability wavelength-spacing-tunable single-longitudinal-mode dual-wavelength erbium-doped fiber laser based on nonlinear amplifying loop mirror 査読

    Shuo Liu, Fengping Yan, Siyu Tan, Yan Bai, Chang Fei, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL AND QUANTUM ELECTRONICS49 ( 1 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    A simple linear cavity configuration for a stability wavelength-spacing-tunable single-longitudinal-mode (SLM) dual-wavelength erbium-doped fiber laser based on a nonlinear amplifying loop mirror (NALM) is proposed. The gain competition in the erbium-doped fiber (EDF) has been suppressed by the intensity dependent loss introduced by the NALM. The SLM operation is guaranteed by a section of unpumped EDF as saturable absorber. A stable dual-wavelength SLM fiber laser with a wavelength-spacing of 11.35 nm is experimentally realized. The optical signal-to-noise ratio is over 47 dB and the linewidths of two wavelengths measured by delayed self-heterodyne method are 1.1 and 1.0125 kHz, respectively. The tuning range of wavelength-spacing is 9.09-11.35 nm, correspondingly, and the THz signal is from 1.235 to 1.416 THz.

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  • Study on Idle Slot Availability Prediction for WLAN using a Probabilistic Neural Network 査読

    Julian Webber, Abolfazl Mehbodniya, Yafei Hou, Kazuto Yano, Tomoaki Kumagai

    2017 23RD ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): BRIDGING THE METROPOLITAN AND THE REMOTE   162 - 167   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We have recently proposed a multi-band wireless local area network (WLAN) system as a solution to the increasingly crowded frequency space. Efficiency can be improved by an agile transceiver that transmits on an idle channel on either or both bands concurrently, and a busy/idle (B/I) predictor will form part of the sensing unit for such a system. A probabilistic neural network (PNN) is studied here for predicting upcoming WLAN B/I status based on pattern matching and classification of previous state patterns. IEEE 802.11 wireless data frames were captured at two hot-spots on multiple channels and the B/I status estimated. The prediction performance is compared for two different locations, channels, prediction matrix dimensions, B/I vs channel occupancy ratio (COR) input types, and frequency of retraining. Results show that the PNN has good potential to estimate the number of idle slots in the upcoming 20 slots and the performance improves with regular retraining.

    DOI: 10.23919/APCC.2017.8304030

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    その他リンク: https://dblp.uni-trier.de/db/conf/apcc/apcc2017.html#WebberMHYK17

  • Noise-like pulse generation from a thulium-doped fiber laser using nonlinear polarization rotation with different net anomalous dispersion 査読

    Shuo Liu, Fengping Yan, Yang Li, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH4 ( 6 ) 318 - 321   2016年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OPTICAL SOC AMER  

    A mode-locked thulium-doped fiber laser (TDFL) based on nonlinear polarization rotation (NPR) with different net anomalous dispersion is demonstrated. When the cavity dispersion is -1.425 ps(2), the noise-like (NL) pulse with coherence spike width of 406 fs and pulse energy of 12.342 nJ is generated at a center wavelength of 2003.2 nm with 3 dB spectral bandwidth of 23.20 nm. In the experimental period of 400 min, the 3 dB spectral bandwidth variation, the output power fluctuation, and the central wavelength shift are less than 0.06 nm, 0.04 dB, and 0.4 nm, respectively, indicating that the NPR-based TDFL operating in the NL regime holds good long-term stability. (C) 2016 Chinese Laser Press

    DOI: 10.1364/PRJ.4.000318

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  • Low-Complexity Channel Estimation and Detection for MIMO-OFDM Receiver With ESPAR Antenna 査読

    Diego Javier Reinoso Chisaguano, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY65 ( 10 ) 8297 - 8308   2016年10月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) receivers with an electronically steerable passive array radiator (ESPAR) antenna can improve bit error rate (BER) performance and obtain additional diversity gain without increasing the number of radio-frequency (RF) front-end circuits. In this scheme, a minimum-mean-square-error (MMSE) channel estimator is employed for obtaining the channel state information. However, its drawbacks include insufficient estimation accuracy and high computational complexity due to the inverse matrix calculation. In this paper, we propose using a low-complexity compressed-sensing-based channel estimation for the MIMO-OFDM receiver with an ESPAR antenna. We also propose a low-complexity detection scheme to further reduce the computational cost required for the detection. The simulation results show that with using the proposed channel estimation method, the BER performance is improved, while its complexity is reduced. The simulations also show that the proposed detection scheme successfully reduces the required computational cost while minimizing the degradation in the BER.

    DOI: 10.1109/TVT.2015.2506782

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  • Quality-Based Channel Allocation Scheme with Predistortion in Multi-Channel Radio over Fiber System 査読

    Withawat Tangtrongpairoj, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEICE TRANSACTIONS ON ELECTRONICSE99C ( 5 ) 563 - 573   2016年5月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Radio over Fiber (RoF) is a promising solution for providing wireless access services. Heterogeneous radio signals are transferred via an optical fiber link using an analog transmission technique. When the RoF and the radio frequency (RF) devices have a nonlinear characteristic, these will create the intermodulation products (IMPs) in the system and generate the intermodulation distortion (IMD). In this paper, the IMD interference in the uplink RF signals from the coupling effect between the downlink and the uplink antennas has been addressed. We propose a method using the dynamic channel allocation (DCA) algorithm with the predistortion (PD) technique to improve the throughput performance of the multi-channel RoF system. The carrier to distortion plus noise power ratio (CDNR) is evaluated for all channel allocation combinations; then the best channel combination is assigned as a set of active channels to minimize the effect of IMD. The results show that the DCA with PD has the lowest IMD and obtains a better throughput performance.

    DOI: 10.1587/transele.E99.C.563

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  • Downhill: BLE-based Multi-Hop Communication Using Smartphones for Detecting Slope Failures 査読

    Manato Fujimoto, Seigi Matsumoto, John Noel Victorino, Hirohiko Suwa, Yutaka Arakawa, Yafei Hou, Julian Webber, Kazuto Yano, Satoshi Tsukamoto, Michinori Hatayama

    The 17th International Workshop on Mobile Computing Systems and Applications (ACM HotMobile 2016)   2016年2月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/ICPPW.2016.18

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  • A Proposal of Wireless Sensor Network System for Slope Failure Detection Using Smartphones

    Yafei Hou, Manato Fujimoto, Hirohiko Suwa, Yutaka Arakawa, Julian Webber, Kazuto Yano, Satoshi Tsukamoto, Tomoaki Kumagai(ATR, Michinori Hatayama, Kyoto, Uni

    The 2016 Vietnam-Japan International Symposium on Antennas and Propagation   2016年2月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Orthogonal Parallel Combinatory Amplitude Shift Keying Modulated Multicarrier System 査読

    Chengbo Liu, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 16TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   7 - 10   2016年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    For some scenarios where high received power cannot be guaranteed due to user moving, the OFDM system with low order M-QAM such as BPSK/QPSK is promising. This paper will propose an orthogonal parallel combinatory ASK modulated multicarrier system to achieve flexible bandwidth efficiency (BWE) using low order ASK modulation and parallel combinatory (PC) code. PC code has been shown that it can achieve flexible BWE and better peak-to-average power ratio (PAPR) performance. Our proposal will utilize PC code for both I-phase and Q-phase of frequency-domain OFDM symbol which further improve the BWE of PC-OFDM system. The proposed system can obtain better BER performance and better PAPR performance using low order ASK modulation. Therefore, the proposed system can simplify the receiver design and provide the design freedom degree with a flexible range of BWE for system design or adaptive modulation and code control.

    DOI: 10.1109/ISCIT.2016.7751581

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  • Fast and Low-complexity Orthogonal Matching Pursuit Based Channel Estimation in ISDB-T Receiver with 3-element ESPAR Antenna 査読

    Rian Ferdian, Yafei Hou, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In a mobile integrated service digital broadcasting-terrestrial (ISDB-T) system, the usage of a 3-elements electrical steerable parasitic array radiator (ESPAR) antenna can be a solution to gain diversity while keeping low power consumption and compact hardware size. But, the ESPAR antenna also increases the channel estimation difficulty as the received signal from each element will interfere each others. Orthogonal matching pursuit (OMP) can become an alternative in obtaining channel information for the system with ESPAR antenna. However, the OMP technique has a drawback in huge matrix inner product in its computation. In this paper, we propose a 3-column OMP with measurement matrix strength reduction technique to reduce the complexity in the inner product computation. The propose method overall result can achieve more than 90% complexity reduction.

    DOI: 10.1109/BMSB.2016.7521988

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  • A Proposal of Half-Symbol Parallel Combinatory Multicarrier Modulation for One-Seg Service of ISDB-T System 査読

    Chengbo Liu, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    One-Seg service is a mobile terrestrial digital audio/video and data broadcasting service in Japan and many other countries. It transmits QPSK modulated symbols to achieve about 416 kbit/s transmission rate for mobile receivers with 428 kHz of bandwidth at UHF band. To further improve the transmission quality and spectrum efficiency, the system design must consider some major issues such as performance degradation from large Doppler shift and small size hardware for receivers which limit the system only to use low-order M-QAM modulation like BPSK or QPSK and small size of power amplifier with a low dynamic range of peak-to-average power ratio (PAPR). To reduce these impacts on the performance of One-Seg service, this paper proposes a BPSK modulated multicarrier system using parallel combinatory (PC) code. The proposed system achieves better BER performance and better PAPR characteristics with a comparable bandwidth efficiency (BWE) compared to that of the corresponding M-QAM modulated OFDM systems.

    DOI: 10.1109/BMSB.2016.7521993

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  • Diversity Gain Analysis of SFN-STBC Digital Terrestrial TV System Using Dual Polarized MIMO Antenna 査読

    Ryan Paderna, Duong Quang Thang, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a Modified Orthogonal Matching Pursuit (MOMP)-assisted MIMO-OFDM receiver for next generation DTTV with Single Frequency Network- Space Time Block Coding (SFN-STBC). The receiver uses dual polarized antennas which can receive signals from different transmitters. In this paper, we investigate the BER performance if the transmitters transmit signals with different signal power where the receiver is in near-far effect with different receive power from different transmitter. In addition, we also examine the performance of the SFN system using MOMP for channel estimation with near-far effect. The simulation shows that the BER decreases if the received signal power from different transmitters are almost equal. And also, the MOMP BER performance is about 1 dB closer compared to ideal channel information in the range of SNR Eb/No=l5dB to Eb/No=25dB region.

    DOI: 10.1109/BMSB.2016.7521981

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  • Configuration of MIMO system using single leaky coaxial cable for linear cell environments 査読

    Yafei Hou, Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Minoru Okada

    IEICE COMMUNICATIONS EXPRESS4 ( 5 ) 143 - 148   2015年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    It has been conventionally assumed that a single leaky coaxial (LCX) cable only is utilized as one antenna to configure a multiple-input multiple-output (MIMO) system. In this letter, we show one single LCX cable can be used as two antennas to configure a MIMO system owing to the designed intersection angle between the different radiation directivities of both input signals. The measurement results of 2 x 2 LCX-MIMO channel quality confirm that our proposed LCX-MIMO can realize a promising channel condition over 5 GHz frequency band. It also points out that the intersection angle between radiation directivities of LCX cable needs to be considered carefully to reduce the channel degradation at the both edge portions of the LCX cable.

    DOI: 10.1587/comex.4.143

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  • Realization of 4-by-4 MIMO Channel Using One Composite Leaky Coaxial Cable 査読

    Yafei Hou, Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Atsuhiko Niwa, Fumio Suzuki, Minoru Okada

    2015 12TH ANNUAL IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE   97 - 102   2015年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Leaky coaxial cable (LCX) is widely used for wireless communication systems as an antenna for a linear-cell, which covers long and shallow areas. Since one LCX is usually utilized as one antenna, more than one LCX is required to configure a multi-input multi-output (MIMO) system. It means it is costly and space-consuming. To resolve these problems, we proposed a novel MIMO method for LCX. In this paper, we propose the method to utilize one composite cable, which consists of a pair of LCXs with different radiation characteristics, to configure a 4 x 4 MIMO channel. The measurement results confirmed that the proposed composite cable can realize a good channel condition for 4 x 4 MIMO transmission even if it is put in an anechoic chamber where no reflection path exists. On the other hand, the results also confirmed that it has good channel condition even if the spacing between a pair of LCX is as small as 2cm for the SGHz band. Therefore the proposed system can reduce the space requirement for MIMO deployment for wireless application over linear-cell environments to cope with the high rapid increase of consumer electronics devices.

    DOI: 10.1109/CCNC.2015.7157953

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  • Improved Compressed Sensing based Channel Estimation for Terrestrial DTV using Auxiliary Pilot Channel 査読

    Ryan Paderna, Yafei Hou, Takeshi Higashino, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   213 - 216   2015年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposed a scattered auxiliary channel subcarriers for OFDM as additional pilots. This will improve the performance of compressed sensing based channel estimation for digital terrestrial TV. The auxiliary channel is designed to convey additional information on modulating signal transmission. The simulation shows that the proposed system has less bit-error-rate compared with the system without scattered auxiliary channel subcarriers. That is because the channel estimation will detect the correct position of the channel impulses with sufficient pilots.

    DOI: 10.1109/ISCIT.2015.7458345

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  • A Study of Capacity of 4-by-4 MIMO Channel Using Leaky Coaxial Cables for Linear-cells 査読

    Sha Li, Yafei Hou, Takeshi Higashino, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   253 - 256   2015年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Leaky coaxial (LCX) cable is widely used in wireless transmission communication systems as antenna for a long and narrow area called as linear-cell. We have proposed that one single LCX cable can be used as two antennas and the method to utilize one composite cable, which consists of a pair of LCXs with different radiation characteristics, to configure a multiple input and multiple-output (MIMO) system. In this paper, we will study capacity of the proposed 4-by-4 LCX-MIMO system and compare its capacity with conventional MIMO system using omnidirectional antennas over 2.4GHz band. We also investigate the capacity difference if the spacing of two LCX cable is changed over 5GHz band. The results over 2.4GHz band show that the proposed system can reduce the space requirement for MIMO deployment for wireless application over linear-cell environments. The capacity results show that proposed LCX-MIMO channel has larger capacity than that of using monopole antennas at both sides. Over 5GHz band, the proposed LCX-MIMO channel using WF allocation scheme can have the capacity near to that of independent and identically distributed (i.i.d.) channel. It has good channel capacity even if the spacing between the pair of LCXs is as small as 2cm. On the other hand, the capacity can be largely improved using the simple EP allocation scheme if the system utilize LCX cables to configure MIMO systems for both 2.4GHz and 5GHz bands.

    DOI: 10.1109/ISCIT.2015.7458355

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  • Effective VLSI Architecture for Compressed Sensing Based Channel Estimation in ISDB-T System 査読

    Rian Ferdian, Yafei Hou, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   273 - 276   2015年

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Compressed Sensing (CS) based channel estimation has been proven to give a better reconstruction results compared to conventional method. Despite promising a better result, CS based channel estimation still suffers from high complexity computations due to huge matrix multiplication and matrix inversion operations. This paper will propose an effective CS based channel estimation VLSI architecture for ISDB-T system. Since ISDBT system is using orthogonal frequency division multiplexing (OFDM) technique for its transmission, its CS channel estimation will utilize a measurement matrix which is formed by parts of Discrete Fourier Transform (DFT) matrix. By exploiting the fact that the measurement matrix will inherit some symmetrical properties from DFT matrix, we can achieve a low complexity CS based channel estimation for practical implementation.

    DOI: 10.1109/ISCIT.2015.7458360

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  • Introducing Dual Regularization Parameters into Regularized Channel Inversion (RCI)-Based Vector Perturbation for Modulo Loss Reduction 査読

    Yafei Hou, Satoshi Tsukamoto, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2014 16TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY (ICACT)   361 - +   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a method to reduce the symbol error caused by modulo operator for regularized channel inversion (RCI)-based vector perturbation (RCI-VP). The proposed method introduces dual regularization parameters of RCI precoding matrix. First regularization parameter alpha(1) is set so as to maximize the signal to interference plus noise ratio (SINR) value of each stream to find the optimal perturbation vector. The second regularization parameter alpha(2) is set so as to minimize the total MSE between the transmitted perturbation vector and received perturbation vector to reduce the symbol error caused by modulo operator. The simulated results confirm that the proposed method can improve the performance of RCI-VP over i.i.d. MIMO channel and frequency-selective fading MIMO channel.

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  • Performance Comparison for 2 by 2 MIMO System Using Single Leaky Coaxial Cable over WLAN Frequency Band 査読

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Minoru Okada

    2014 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA)   1 - 5   2014年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In linear service areas such as a tunnel and along railways, leaky coaxial cable (LCX) is widely used as antenna for radio communication. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. We have recently proposed a method that one single LCX can be utilized as two antennas by feeding different RF transmit signals to each end of the proposed cable. In this paper, we compare 2x 2 MIMO system performance using the proposed LCX and using conventional monopole antennas over 2.4GHz band for WLAN appliances. The results confirm that our proposed 2x 2 MIMO channel using a single LCX can realize a good channel condition and bit error ratio (BER) performance for MIMO transmission even within a highly correlated propagation condition. On the other hand, it also shows that the proposed LCX MIMO is promising technique for communications over linear-cell environments from the simulated results which considering the path loss and radiation pattern of LCX characteristics.

    DOI: 10.1109/APSIPA.2014.7041735

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  • An experimental evaluation of 2 × 2 MIMO system using closely-spaced leaky coaxial cables. 査読

    Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Yafei Hou, Kiyoshi Kobayashi, Tomoaki Kumagai

    Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014, Chiang Mai, Thailand, December 9-12, 2014   1 - 5   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    DOI: 10.1109/APSIPA.2014.7041676

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  • 4-by-4 MIMO Channel Using Two Leaky Coaxial Cables (LCXs) for Wireless Applications over Linear-cell 査読

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Minoru Okadat

    2014 IEEE 3RD GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   125 - 126   2014年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We have recently proposed a novel 2 x 2 multipleinput multiple-output (MIMO) system that utilizes a single leaky coaxial cable (LCX) as two antennas. In this paper, we further propose a 4 x 4 MIMO system by combining two LCXs that have different radiation characteristics into one composite cable and evaluate characteristics of the channel with different spacing between the LCXs. Since the different radiation characteristics create different propagation paths, the proposed system with small spacing between LCXs can realize an efficient channel condition for 4 x 4 MIMO transmission. As a result of measurement at 2.4 GHz band, the smaller spacing as to 1 em between LCXs makes better 4 x 4 MIMO channel condition for transmission. This result indicates that the proposed system can reduce the space requirement for system deployment.

    DOI: 10.1109/GCCE.2014.7031177

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  • 2 by 2 MIMO System Using Single Leaky Coaxial Cable for Linear-cells 査読

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Minoru Okada

    2014 IEEE 25TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATION (PIMRC)   327 - 331   2014年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Leaky coaxial cables (LCX) have been widely used as antennas to form linear service areas for radio communication systems. Such services of linear cells have been deployed inside tunnels, along railways, and so on. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. In this paper, we propose a MIMO system using single LCX, which can be utilized as two antennas. When different RF transmit signals are fed to each end of the proposed cable, single LCX can work as two antennas. To confirm the feasibility of the proposed MIMO system, we conduct experiments to measure the characteristics of 2 x 2 MIMO channel using single LCX. The results confirm that our proposed 2 x 2 MIMO channel using single LCX can realize a good channel condition for MIMO transmission even within a highly correlated propagation condition. The proposed MIMO system using LCX will release the space requirement and reduce the cost of system for configuration of LCX MIMO system especially with large number of LCXs. It benefits the design and configuration of LCX-MIMO system for many scenarios of linear-cell.

    DOI: 10.1109/PIMRC.2014.7136184

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  • Introduction of Dual Regularization Parameters to Improve the Performance of MMSE Based Vector Perturbation 査読

    Yafei Hou, Satoshi Sonobe, Satoshi Tsukamoto, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2013 15TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY (ICACT)   558 - 562   2013年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a method to improve the performance of minimum-mean square error (MMSE) based vector perturbation (MMSE-VP) by introducing dual regularization parameters of MMSE precoding matrix. First regularization parameter alpha(1) is set so as to maximize the signal to interference plus noise ratio (SINR) value of each stream to find the optimal perturbation vector. The second regularization parameter alpha(2) is set as to minimize the total MSE between the transmitted perturbation vector and received perturbation vector to precancel the interference among the streams. The simulated results confirm that the proposed method can improve the performance of MMSE-VP over i.i.d. MIMO channel and indoor correlated frequency-selective fading MIMO channel.

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  • A Simple Method of Transmitting Stream Adaptation for Fixed-Matrix-Size Precoding on MU-MIMO Transmission 査読

    Yafei Hou, Satoshi Sonobe, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2012 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)   136 - 141   2012年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    During the operation of multiuser multiple-input-multiple output (MU-MIMO) algorithms, some antennas of BS or UEs may neither transmit nor receive signals due to the long distance or unexpected damages. Therefore, the BS cannot obtain the channel state information (CSI) from/to these antennas. Without these CSI, the performance of algorithm is degraded. We call this effect as 'broken antenna effect (BAE).' To cope with this issue, this paper proposes a process to regularize the channel matrix by replacing the missing CSI with zero(s) and setting non-zero values to diagonal elements. Then, it is confirmed through computer simulation that the proposed method can adjust the number of transmitting parallel streams according to the number of 'broken' antennas, and provide MU-MIMO transmission with maximum diversity order without any change of the precoding process.

    DOI: 10.1109/WCNC.2012.6213993

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  • Channel Estimation Improvement with Frequency Domain MMSE Equalization for PCP-SC System 査読

    Yafei Hou, Tomohiro Hase

    IEICE TRANSACTIONS ON COMMUNICATIONSE94B ( 6 ) 1690 - 1698   2011年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this paper, we propose a simple but effective way of improving the performance of channel estimation (CE) for pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shifting signal of the PCP pilot signal can also be utilized to estimate the channel information. The receiver can continuously estimate the channel information by just shifting the received pilot signal. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain in terms of the mean squared error (MSE) of channel estimation with a slight increase in computational complexity. The BER performance with the proposed CE improvement are evaluated in a multipath fading channel using a zero-forcing (ZF) equalizer and an minmum mean squared error (MMSE) equalizer by computer simulation. It is shown that the proposed CE improvment method using an MMSE equalizer which has an unbiased vlaue of noise variance (NV) estimator gives a promising BER performance. The proposed method also benefits the estimation of the SNR for the single carrier system.

    DOI: 10.1587/transcom.E94.B.1690

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  • Channel Estimation Improvement for MIMO Single-Carrier Block Transmission System 査読

    Yafei Hou, Tomohiro Hase

    2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC)   2011年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this paper, we propose an effective way of improving the performance of channel estimation for MIMO single-carrier block transmission (SCBT) systems. The proposed method utilizes the property that the shift of the cyclic pilot signal of each antenna branch can also be utilized to catch the channel information as a new pilot for MIMO SCBT systems. The receiver can continuously estimate the channel information by just shifting the received pilot signal. The channel estimation performance is improved by averaging all channel estimators since this averaging process can reduce the power of noise component. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain in term of the mean squared error (MSE) of channel estimation for each antenna branch with slightly computational complexity. The proposed method can be also utilized to most channel estimation methods for the MIMO SCBT system.

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  • Flexible Parallel Combinatory OFDM System 査読

    Yafei Hou, Tomohiro Hase

    2ND IEEE INTERNATIONAL CONFERENCE ON ADVANCED COMPUTER CONTROL (ICACC 2010), VOL. 1   436 - 441   2010年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this paper, combining the parallel combinatory (PC) code and the a flexible OFDM structure [7], we report the design of a new OFDM system with PC code for various applications with a moderate transmission rate. The system can select appropriate phase sets for all modulated subcarriers for each PC code for different design requirements such as peak-to-average power ratio (PAPR) reduction or HER performance improvement. The proposed system will achieve better PAPR characteristics and promising HER performance. In addition, due to the flexible OFDM structure, the proposed PC-OFDM system will also have properties of high adaptability and compatibility.

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  • Channel and Noise Variance Estimation Improvement for PCP-SC System 査読

    Yafei Hou, Tomohiro Hase

    2010 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC 2010)   2010年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this paper, we propose a simple but effective way of improving the performance of channel estimation and catching the noise variance for pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shift of the PCP pilot signal can also be utilized to catch the channel information as a new pilot. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain for the mean squared error (MSE) of channel estimation with slightly additional computational complexity. In addition, regardless of the pilot type, the receiver can generate a new random signal from the pilot signal. The new signal has an identical variance value to that of the mixed AWGN noise. The proposed estimation method for noise variance is independent of channel estimation errors. Therefore it simplifies the receiver design and improves the system performance.

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  • New OFDM Structure with Parallel Combinatory Code 査読

    Yafei Hou, Tomohiro Hase

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS55 ( 4 ) 1854 - 1859   2009年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have introduced a flexible OFDM structure based on a promising property of IFFT operation [7]. This structure can support uplink applications which include many transmitters using different numbers of subcarriers and one receiver with just one IFFT/FFT module with the subcarriers of the least common multiple (LCM) for the number of subcarriers of all the transmitters. In this paper, combining the Parallel combinatory (PC) code and the proposed flexible OFDM structure, we report the design of a new OFDM system with PC code for various applications with a moderate transmission rate. The system can select appropriate Phase sets for all modulated subcarriers for each PC code for different design requirements such ay peak-to-average power ratio (PAPR) reduction or BER performance improvement. The proposed system will achieve better PAPR characteristics and promising BER performance. In addition, due to the flexible OFDM structure, the proposed PC-OFDM system will also have properties of high adaptability and compatibility(1).

    DOI: 10.1109/TCE.2009.5373742

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  • Improvement on the Channel Estimation of Pilot Cyclic Prefixed Single Carrier (PCP-SC) System 査読

    Yafei Hou, Tomohiro Hase

    IEEE SIGNAL PROCESSING LETTERS16 ( 8 ) 719 - 722   2009年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The pilot cyclic prefixed single carrier (PCP-SC) system has the ability to achieve channel estimation in a fast-fading environment. It also enables symbol recovery even when the frequency domain of the channel has nulls. This letter proposes a simple but effective way of improving the performance of channel estimation. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the receiver can achieve about a 1.72 dB performance gain for the mean squared error (MSE) of channel estimation if it implements the proposed method with slightly additional computational complexity. The proposed method can also be utilized in any type of pilot in PCP-SC and MIMO systems.

    DOI: 10.1109/LSP.2009.2023953

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  • New Flexible OFDM Structure for Consumer Electronics Communication Systems 査読

    Yafei Hou, Tomohiro Hase

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS55 ( 1 ) 191 - 198   2009年2月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper introduces a promising property in which the transmitter of an OFDM system can utilize an N-point IFFT operation to build the time-domain symbols of a KN-point IFFT operation. Based on this property, we propose a flexible OFDM structure. This structure will support uplink applications which include many transmitters using different numbers of subcarriers and one receiver with just one IFFT/FFT module with the subcarriers of least common multiple (LCM) for the number of subcarriers of all the transmitters. Therefore it reduces the design complexities of the receiver and increases the compatible characteristics for consumer electronics (CE). Compared with the original OFDM system, the proposed system improves the performance of the packet error ratio (PER) and the bit error ratio (BER) performance by using the appropriate K. In addition, the proposed structure can be designed to enlarge the bandwidth efficiency of the system and improve the performance of channel estimation compared with the OFDM/TDM system.(1)

    DOI: 10.1109/TCE.2009.4814434

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  • New OFDM System without Guard Interval 査読

    Yafei Hou, Tomohiro Hase

    2009 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS   159 - 160   2009年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a new OFDM system without a guard interval (GI) based on the useful characteristics of IFFT operation. The system utilizes the pilot signal to capture the channel information as well as GI does. Therefore, the bandwidth efficiency of the system can be improved. In addition, it achieves promising peak-to-average power ratio (PAPR) characteristics which also decrease the cost of handsets.

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  • Parallel Combinatory OFDM/TDM System 査読

    Yafei Hou, Tomohiro Hase

    ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   165 - +   2009年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Combined with OFDM with time division multiplexing (OFDM/TDM) system and parallel combinatory (PC) code, we propose a new OFDM system which can be utilized to the communication systems of consumer electronics. Compared with the original OFDM system, the proposed system will achieve promising BER performance and better PAPR characteristics.

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  • Improvement on the Channel Estimation of Pilot Cyclic Prefixed Single Carrier (PCP-SC) System 査読

    Yafei Hou, Tomohiro Hase

    2009 IEEE 70TH VEHICULAR TECHNOLOGY CONFERENCE FALL, VOLS 1-4   708 - +   2009年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper will propose a simple hut effective way to improve the performance of channel estimation of pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shift of pilot cyclic prefixed signal can also be utilized to catch the channel information as a new pilot. The receiver can continuously estimate the channel information by just shifting the received signal. Regardless or signal-to-noise ratio (SNR) and pilot type, the receiver can achieve about 1.72 dB performance gain for MSE of channel estimation if it implements the proposed method with a slight additional computational complexity. The proposed method can also be utilized in any types of pilot in PCP-SC and MIMO system.

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  • OFDM transmitter structure with low PAPR 査読

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   590 - +   2008年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a new OFDM transmitter structure which can be realized by a smaller FFT chip based on the useful characteristics of IFFT operation. The proposed system benefits the design of handsets. In addition, it achieves promising peak-to-average power ratio (PAPR) characteristics which also decreases the cost of handsets.

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  • Collision-captured multicarrier modulation system 査読

    Yafei Hou, Tomohiro Hase

    2008 IEEE SARNOFF SYMPOSIUM   345 - +   2008年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a new system called the collision-captured multicarrier modulation system which can realize the capture of a packet collision. Based on the OFDM system using partial symbol transmission, the transmitter can select a specific duration to achieve promising PAPR characteristics and realize the capture of a packet collision. The simulated results show that over 90% collision occurrences and the correct position of the collided part can be captured even in severe near-far situations. The proposed system can also achieve a PAPR reduction with an acceptable BER performance degradation.

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  • Collision-Recovery Method for Collided OFDM Based Packets 査読

    Yafei Hou, Tomohiro Hase

    2008 IEEE 19TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS   688 - 693   2008年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    We present an effective method of collision recovery for orthogonal frequency division multiplexing (OFDM)-based communications. For the OFDM system, the modulated message data can be demodulated using the partial time-domain OFDM symbol. Therefore, the partial time-domain symbol can be adopted to reconstruct the whole OFDM time-domain symbol with estimated channel information. This property can be utilized to recover packets from the collisions. Since most collisions are cases in which a long packet collides with short packets, the collided part is assumed to be short. The simulated results show that the method can recover all packets with different specific probabilities and can be developed to solve the problem of hidden terminals.

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  • OFDM system for capturing collision 査読

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   601 - +   2008年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a new system called the collision-captured OFDM system which can realize the capture of a packet collision based on the OFDM system using partial symbol transmission. The simulated results show that over 90% of collision occurrences and the correct position of the collided part can be captured even in severe near-far situations.

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  • A new way of PAPR reduction for OFDM system 査読

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   586 - +   2008年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes a new peak-to-average power ratio (PAPR) reduction technique for OFDM systems. The proposed system selects the specific duration of each time-domain OFDM symbol which can achieve a promising PAPR, to transmit equal bits of data. Compared with the OFDM system using amplitude clipping, PST can obtain comparable PAPR performance and achieve a 0.5 - 3 dB BER performance gain by choosing the appropriate parameters. In addition, PST does not need any complex modules to fix the original phases of the clipped samples, so it decreases the cost of transmitters.

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  • A novel modulation with parallel combinatory and high compaction multi-carrier modulation 査読

    Yafei Hou, Masanori Hamamura

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCESE90A ( 11 ) 2556 - 2567   2007年11月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this paper, we propose a new modulation named parallel combinatory/high compaction multi-carrier modulation (PC/HC-MCM) using the techniques of parallel combinatory orthogonal frequency division multiplexing (PC-OFDM) and high compaction multi-carrier modulation (HC-MCM). Two types of PC/HC-MCM systems, which are named as modulated PC/HC-MCM system and (unmodulated) PC/HC-MCM system, can be designed. The modulated PC/HC-MCM system achieves better bit-error rate (BER) performance than that of HC-MCM system with equal bandwidth efficiency (BWE). The PC/HC-MCM system can obtain the better peak-to-average power ratio (PAPR) characteristics by selecting appropriate constellation for each subcarrier. On the other hand, since PC/HC-MCM can divide the PC-OFDM symbol duration into multiple time-slots, the advantages of frequency hopping (FH) can be applied in the PC/HC-MCM system. Therefore, we also combine the PC/HC-MCM and frequency hopping multiple access (FHMA) to propose a novel multiple access (MA) system. It can simultaneously transmit multiple users' data within one symbol duration of PC-OFDM.

    DOI: 10.1093/ietfec/e90-a.11.2556

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  • Collision recovery for OFDM system over wireless channel 査読

    Yafei Hou, Masanori Hamamura

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCESE90A ( 7 ) 1312 - 1322   2007年7月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    We present an effective method of collision recovery for orthogonal frequency division multiplexing (OFDM)-based communications. For the OFDM system, the modulated message data can be demodulated using the partial time-domain OFDM signal. Therefore, the partial time-domain signal can be adopted to reconstruct the whole OFDM time-domain signal with estimated channel information. This property can be utilized to recover packets from the collisions. Since most collisions are cases in which a long packet collides with a short packet, the collided part is assumed to be short. The simulated results show that the method can recover the two collided packets with a certain probability and can be developed to solve the problem of hidden terminals. This method will dramatically benefit the protocol design of wireless networks, including ad hoc and sensor networks.

    DOI: 10.1093/ietfec/e90-a.7.1312

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  • Fast index for XML data 査読

    Ping Yi, Yafei Hou, Yue Wu, Jianhua Li

    Journal of Computational Information Systems3 ( 1 ) 97 - 107   2007年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Novel parallel combinatory system with high compaction multicarrier modulation 査読

    Journal on Communications28 ( 1 ) 69 - 74   2007年1月

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    担当区分:筆頭著者   記述言語:中国語   掲載種別:研究論文(学術雑誌)  

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  • Flooding attack and defence in ad hoc networks 査読

      17 ( 2 ) 410 - 416   2006年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/s1004-4132(06)60070-4

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▼全件表示

MISC

  • 多値QAMのための過負荷MIMO線形受信機における繰返し硬判定復号法 (信号処理)

    藤原 拓也, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報119 ( 377 ) 1 - 6   2020年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Autoregressiveモデルに基づくBusy/Idle状態継続時間予測における継続時間履歴に基づくカテゴライズに関する一検討 (信号処理)

    田中 佑典, 侯 亜飛, 田野 哲, 鈴木 義規

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報118 ( 434 ) 121 - 126   2019年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 確率的ニューラルネットワークを用いた無線LANチャネルのアイドル状態予測とそのFPGA実装 (スマート無線) -- (特集セッション「機械学習や人工知能が応用されているスマート無線技術」)

    ウェバー ジュリアン, メーボドニヤ アボルファズル, 侯 亜飛, 矢野 一人, 臼井 誠, 熊谷 智明

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報117 ( 457 ) 117 - 124   2018年2月

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  • 周期性干渉除去におけるサイドバンド選択法 (情報理論)

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報117 ( 394 ) 61 - 65   2018年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 周期性干渉除去におけるサイドバンド選択法 (無線通信システム)

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報117 ( 396 ) 61 - 65   2018年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 周期性干渉除去におけるサイドバンド選択法 (信号処理)

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報117 ( 395 ) 61 - 65   2018年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 漏洩同軸ケーブルMIMO伝搬を用いた無線端末位置計測 (アンテナ・伝播) -- (オーガナイズドセッション 将来の無線システムを創造する電波伝搬の研究)

    岡田 実, 東野 武史, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報116 ( 397 ) 7 - 11   2017年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Bluetooth Low Energyマルチホップ通信を用いた斜面崩壊予兆検知システムの実装と評価

    藤本 まなと, 松本 誠義, 諏訪 博彦, 荒川 豊, 侯 亜飛, 塚本 悟司, ウエバー ジュリアン, 矢野 一人, 畑山 満則

    マルチメディア,分散協調とモバイルシンポジウム2016論文集 ( 2016 ) 638 - 644   2016年7月

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    記述言語:日本語  

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  • 無線LAN/Bluetooth混在マルチホップセンサネットワークの自律的構築および情報のプロパティに応じた優先制御 (無線通信システム) -- (移動通信ワークショップ)

    矢野 一人, 塚本 悟司, ウェバー ジュリアン, 熊谷 智明, 侯 亜飛, 藤本 まなと, 諏訪 博彦, 荒川 豊, 畑山 満則

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報115 ( 472 ) 49 - 54   2016年3月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • B-17-8 無線LAN・Bluetooth混在型マルチホップネットワークシステム(B-17.スマート無線,一般セッション)

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    電子情報通信学会総合大会講演論文集2016 ( 1 ) 611 - 611   2016年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 中古スマホによる斜面崩壊検出センサネットワーク構築 (第22回社会情報システム学シンポジウム) -- (一般セッション講演 安全・安心社会とIT)

    諏訪 博彦, 松本 誠義, 藤本 まなと, 荒川 豊, 侯 亜飛, 塚本 悟司, ウエバー ジュリアン, 矢野 一人, 畑山 満則

    社会情報システム学シンポジウム学術講演論文集22   209 - 212   2016年1月

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    記述言語:日本語   出版者・発行元:社会情報システム学研究会  

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  • LCX(漏えい同軸ケーブル)を用いた無線LANシステム

    塚本 悟司, 侯 亜飛, 鈴木 文生, 丹羽 敦彦

    電子情報通信学会 通信ソサイエティマガジン10 ( 2 ) 86 - 91   2016年

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    記述言語:日本語   出版者・発行元:一般社団法人 電子情報通信学会  

    DOI: 10.1587/bplus.10.86

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  • A-5-11 LCX-MIMOシステムにおけるMUSIC法を用いた位置検出(A-5.ワイドバンドシステム,一般セッション)

    沖 修平, 侯 亜飛, 東野 武史, 岡田 実

    電子情報通信学会総合大会講演論文集2015   121 - 121   2015年2月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • LCXを用いた4×4MIMOシステムにおける無線端末の二次元位置検出(学生および若手発表,アンテナ伝搬における学生若手発表および一般)

    沖 修平, 侯 亜飛, 東野 武史, 岡田 実

    映像情報メディア学会技術報告39 ( 0 ) 45 - 48   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人 映像情報メディア学会  

    本稿では漏洩同軸ケーブルアンテナ(LCX: Leaky CoaXial cable antenna)を用いた無線端末の位置検出方式を提案する.これまで単一のLCXを用いた2×2MIMOシステムにおいて長手方向の位置推定を行っていたが,本稿では最大放射角が異なる2種のLCXを使用してアンテナの多重数を4×4へ拡張させることで,二次元の位置検出が可能であることを示す.さらに,到来時間差推定の際に空間分解能を元にするステアリングベクトルを用いるMUSIC (MUItiple Slgnal Classification)法を適用することで推定精度の改善手法を提案する.電波暗室内で伝搬路応答を取得した上で,計算機を使用した性能評価を行った結果,従来手法よりも高い精度が得られることがわかった.

    DOI: 10.11485/itetr.39.4.0_45

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  • LCX-MIMOシステムにおけるMUSIC法を用いた高精度端末位置検出 (スマートインフォメディアシステム)

    沖 修平, 侯 亜飛, 東野 武史, 岡田 実

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報114 ( 370 ) 119 - 123   2014年12月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本稿では漏洩同軸ケーブルを用いたLCX-MIMO端末位置検出システムについて,端末から無線信号がLCXの両端に到着する時間差を利用して位置推定を行う.到来時間差の検出の際に,MUSIC法を適用することで観測帯域幅を増加させずに推定精度を改善する手法を提案し,計算機による性能評価の結果,逆フーリエ変換を用いた位置推定に比べて高い精度が得られることがわかった.

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  • 漏洩同軸ケーブルによるリニアセルMIMO技術 : 高信頼・低遅延な5G移動通信の実現に向けて (無線通信システム) -- (特集セッション 将来無線通信)

    塚本 悟司, 前田 隆宏, 侯 亜飛, 有吉 正行, 小林 聖, 熊谷 智明

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報114 ( 254 ) 55 - 60   2014年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    移動体無線システムでの小セル化に伴う移動時のハンドオーバ頻度の増加を防ぎ,見通し環境でのMIMO多重度を安定的に高めるため,漏洩同軸ケーブル(LCX)を用いたリニアセルでのMIMO技術を検討した.リニアセルの優位点とLCXの構造や放射原理について延べ,提案している単LCXによる2×2MIMO構成法と2本の近接設置したLCXによる2×2MIMOの構成法を概説する.そして,MIMOの性能指標の一つであるコンディションナンバと,市販のIEEE802.11n対応機器によるスループット測定結果から,提案方式が実現可能であることを示す.

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  • B-1-147 単一漏洩同軸ケーブルによる2×2 MIMOシステムのBLER測定(B-1.アンテナ・伝搬C(アンテナシステム),一般セッション)

    塚本 悟司, 前田 隆宏, 侯 亜飛, 有吉 正行, 小林 聖

    電子情報通信学会ソサイエティ大会講演論文集2014 ( 1 ) 147 - 147   2014年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 光OOK重畳ファイバ無線システムの提案(<特集セッション>無線分散ネットワーク,無線分散ネットワーク,M2M(Machine-to-Machine),D2D(Device-to-Device),一般)

    金子 裕哉, 東野 武史, 侯 亜飛, 岡田 実

    電子情報通信学会技術研究報告. NS, ネットワークシステム114 ( 163 ) 129 - 130   2014年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ブロードバンドワイヤレス通信システムの輻輳を緩和するために,小型基地局を多数配置しデータオフロードを行う方法が用いられている.しかし,小型基地局の維持費が問題である.一方,光ファイバ無線(RoF: Radio over Fiber)技術による中央一括制御を用いることにより複数のスモールセルを低コストで運用することが可能となる.本研究ではファイバの節約と容易なRoFの導入のために,イーサネットで使用される光OOK信号とRoFの無線信号を同時伝送するシステムを提案し,10Gイーサネットを使用した提案システムの無線信号品質の実験結果について報告する.実験により本システムでは,光OOK信号と無線信号の相互干渉が問題となることを明らかにした.この問題を解決するための干渉除去法および最適復調法を示す.

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  • 光OOK重畳ファイバ無線システムの提案(<特集セッション>無線分散ネットワーク,無線分散ネットワーク,M2M(Machine-to-Machine),D2D(Device-to-Device),一般)

    金子 裕哉, 東野 武史, 侯 亜飛, 岡田 実

    電子情報通信学会技術研究報告. RCS, 無線通信システム114 ( 164 ) 183 - 184   2014年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ブロードバンドワイヤレス通信システムの輻輳を緩和するために,小型基地局を多数配置しデータオフロードを行う方法が用いられている.しかし,小型基地局の維持費が問題である.一方,光ファイバ無線(RoF: Radio over Fiber)技術による中央一括制御を用いることにより複数のスモールセルを低コストで運用することが可能となる.本研究ではファイバの節約と容易なRoFの導入のために,イーサネットで使用される光OOK信号とRoFの無線信号を同時伝送するシステムを提案し,10Gイーサネットを使用した提案システムの無線信号品質の実験結果について報告する.実験により本システムでは,光OOK信号と無線信号の相互干渉が問題となることを明らかにした.この問題を解決するための干渉除去法および最適復調法を示す.

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  • 光OOK重畳ファイバ無線システムの提案(<特集セッション>無線分散ネットワーク,無線分散ネットワーク,M2M(Machine-to-Machine),D2D(Device-to-Device),一般)

    金子 裕哉, 東野 武史, 侯 亜飛, 岡田 実

    電子情報通信学会技術研究報告. RCC, 高信頼制御通信114 ( 162 ) 151 - 152   2014年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ブロードバンドワイヤレス通信システムの輻輳を緩和するために,小型基地局を多数配置しデータオフロードを行う方法が用いられている.しかし,小型基地局の維持費が問題である.一方,光ファイバ無線(RoF: Radio over Fiber)技術による中央一括制御を用いることにより複数のスモールセルを低コストで運用することが可能となる.本研究ではファイバの節約と容易なRoFの導入のために,イーサネットで使用される光OOK信号とRoFの無線信号を同時伝送するシステムを提案し,10Gイーサネットを使用した提案システムの無線信号品質の実験結果について報告する.実験により本システムでは,光OOK信号と無線信号の相互干渉が問題となることを明らかにした.この問題を解決するための干渉除去法および最適復調法を示す.

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  • 光OOK重畳ファイバ無線システムの提案(<特集セッション>無線分散ネットワーク,無線分散ネットワーク,M2M(Machine-to-Machine),D2D(Device-to-Device),一般)

    金子 裕哉, 東野 武史, 侯 亜飛, 岡田 実

    電子情報通信学会技術研究報告. ASN, 知的環境とセンサネットワーク114 ( 166 ) 159 - 160   2014年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ブロードバンドワイヤレス通信システムの輻輳を緩和するために,小型基地局を多数配置しデータオフロードを行う方法が用いられている.しかし,小型基地局の維持費が問題である.一方,光ファイバ無線(RoF: Radio over Fiber)技術による中央一括制御を用いることにより複数のスモールセルを低コストで運用することが可能となる.本研究ではファイバの節約と容易なRoFの導入のために,イーサネットで使用される光OOK信号とRoFの無線信号を同時伝送するシステムを提案し,10Gイーサネットを使用した提案システムの無線信号品質の実験結果について報告する.実験により本システムでは,光OOK信号と無線信号の相互干渉が問題となることを明らかにした.この問題を解決するための干渉除去法および最適復調法を示す.

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  • 光OOK重畳ファイバ無線システムの提案(<特集セッション>無線分散ネットワーク,無線分散ネットワーク,M2M(Machine-to-Machine),D2D(Device-to-Device),一般)

    金子 裕哉, 東野 武史, 侯 亜飛, 岡田 実

    電子情報通信学会技術研究報告. SR, スマート無線114 ( 165 ) 171 - 172   2014年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ブロードバンドワイヤレス通信システムの輻輳を緩和するために,小型基地局を多数配置しデータオフロードを行う方法が用いられている.しかし,小型基地局の維持費が問題である.一方,光ファイバ無線(RoF: Radio over Fiber)技術による中央一括制御を用いることにより複数のスモールセルを低コストで運用することが可能となる.本研究ではファイバの節約と容易なRoFの導入のために,イーサネットで使用される光OOK信号とRoFの無線信号を同時伝送するシステムを提案し,10Gイーサネットを使用した提案システムの無線信号品質の実験結果について報告する.実験により本システムでは,光OOK信号と無線信号の相互干渉が問題となることを明らかにした.この問題を解決するための干渉除去法および最適復調法を示す.

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  • ベクトル摂動に基づく非線形マルチユーザMIMO伝送システムの開発及びフィールド検証結果 (小特集 マルチユーザMIMO : マルチアンテナとマルチユーザの相乗効果による通信速度向上)

    矢野 一人, 塚本 悟司, 薗部 聡司, 候 亜飛, 伴 弘司, 宇野 雅博, 小林 聖

    電子情報通信学会誌 = The journal of the Institute of Electronics, Information and Communication Engineers97 ( 4 ) 307 - 312   2014年4月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    筆者らは,見通し伝搬路のような伝搬路相関の高い環境における伝送特性を改善するため,ベクトル摂動(Vector Perturbation)に基づく8×8アンテナ構成の非線形マルチユーザMIMO-OFDM伝送システムを開発した.本稿ではその概要を述べ,屋外見通し伝搬路における伝送実験を通じ,空間フィルタリングに基づく線形マルチユーザMIMO伝送と比較して本伝送方式が約1.9倍の周波数利用効率を達成可能であることを示す.更に,本伝送実験を通じて明らかになった非線形マルチユーザMIMOの実用化に向けた課題についても述べる.

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  • B-5-108 連続切換型アレーアンテナ技術の研究開発 : 超高速移動時の無線通信速度向上に向けて(B-5.無線通信システムB(無線アクセスネットワーク),一般セッション)

    塚本 悟司, 候 亜飛, 有吉 正行, 馬場 亮輔, 山本 真一郎, 相河 聡

    電子情報通信学会総合大会講演論文集2014 ( 1 ) 503 - 503   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • B-5-109 連続切換型アレーアンテナに向けた伝搬路特性の基礎検討(B-5.無線通信システムB(無線アクセスネットワーク),一般セッション)

    馬場 亮輔, 山本 真一郎, 相河 聡, 塚本 悟司, 候 亜飛, 有吉 正行

    電子情報通信学会総合大会講演論文集2014 ( 1 ) 504 - 504   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 連続切換型アレーアンテナの実現に向けた基本特性評価 : 超高速移動時の無線通信速度向上に向けて (ソフトウェア無線)

    馬場 亮輔, 山本 真一郎, 相河 聡, 塚本 悟司, 侯 亜飛, 有吉 正行

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報113 ( 457 ) 47 - 51   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年,スマートフォンなどの携帯通信端末が生活必需品となってきており,列車内などに多数の端末が高密度で存在している.携帯通信端末の増加に伴って公衆無線LANサービスの提供も増加しているが,2020年には通信量が現在の10倍になると予想されていることなどから,エントランス回線の容量不足が懸念されている.新幹線などの高速移動体でも公衆無線LANサービスは提供されているが,従来の等化技術では高速なチャネル変動による性能劣化を抑えきれないため,新たな対策が必要である.そこで列車の進行方向とは逆順に受信アンテナ素子を切換えることにより,実質的に受信点を一定位置に固定し,チャネル変動を低速化する技術に着目した.アンテナ切換え技術では,適切なアンテナ素子間隔の設定,素子切換え周期やタイミング,スイッチや回路での影響低減やMIMOへの対応といった問題がある.本稿では,基礎検討としてアンテナ切換え技術による受信信号の特性のシミュレーションを行った.シミュレーションの結果,アンテナ切換え技術により高速移動時でも静止時と同等の受信特性を得られることがわかったが,素子切換え時の誤差として受信特性に不連続部分が発生する問題が浮かび上がった.

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  • 依頼講演 単一漏洩同軸ケーブルによる2×2MIMOシステムの提案と実験による検討 (アンテナ・伝播)

    塚本 悟司, 前田 隆宏, 侯 亜飛, 阿野 進, 伴 弘司, 有吉 正行, 小林 聖, 丹羽 敦彦, 鈴木 文生, 東野 武史, 岡田 実

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報113 ( 428 ) 51 - 56   2014年2月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    携帯電話や無線LANの通信量が著しく増加しており,会議場や駅構内など多数のユーザが高密度に存在する環境では無線リソースの不足が顕在化しつつある.この対策として,小セル化やMIMOの導入が有効だが,移動時のハンドオーバ頻度の増加や見通し環境でのMIMO性能劣化が避けられない.そこで,筆者らはマイクロ波帯で使用可能な漏洩同軸ケーブル(LCX)を用いてこれらの問題を軽減する方法を検討している.従来のMIMOではアンテナ数分のLCXが必要となるが,単LCXを2アンテナ相当として動作させることでLCX数を半減する手法を提案し,その実現性を実験により確認した.伝搬路のコンディションナンバをMIMO性能指標としてLCXにより形成されるリニアセル内の場所率やスループットの基本評価を行うとともに,ハンドオーバでのトリガとして必要とされる位置検出についても検討を行なったので報告する.

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  • BP-1-4 Vector Perturbationに基づく非線形マルチユーザMIMOの低速移動環境における性能評価(BP-1.MIMO技術のさらなる発展,パネルセッション,ソサエティ企画)

    矢野 一人, 薗部 聡司, 候 亜飛, 塚本 悟司, 宇野 雅博, 小林 聖

    電子情報通信学会ソサイエティ大会講演論文集2013 ( 1 ) "SS - 9"-"SS-10"   2013年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • B-5-6 Vector perturbationにおける拡大信号点空間上の信号点シンメトリ配置を用いたMU-MIMOの屋外実験(B-5.無線通信システムA(移動通信))

    薗部 聡司, 塚本 悟司, 前田 隆宏, 侯 亜飛, 矢野 一人, 宇野 雅博, 小林 聖

    電子情報通信学会総合大会講演論文集2013 ( 1 ) 416 - 416   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • Vector perturbationにおけるストリーム間干渉を考慮したmodulo格子サイズ設定に関する一検討 (無線通信システム)

    矢野 一人, 薗部 聡司, 侯 亜飛, 塚本 悟司, 宇野 雅博, 小林 聖

    電子情報通信学会技術研究報告 : 信学技報112 ( 351 ) 251 - 256   2012年12月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本稿ではMMSE空間フィルタリングを用いたvector perturbationにおけるmodulo格子サイズの設定誤差低減に向けて,プリコーディング後の所望波成分とストリーム間干渉成分の双方を考慮してmodulo格子サイズを設定する手法を提案する.そして,WINNER II A1 LOS伝搬路を仮定した下りリンクマルチユーザMIMO-OFDM伝送の計算機シミュレーションにより提案手法の有効性を示す.

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  • 小セル環境への適用に向けた非線形マルチユーザMIMOシステムの研究開発 : 〜効果と実用化に向けた課題〜

    矢野 一人, 薗部 聡司, 侯 亜飛, 塚本 悟司, 伴 弘司, 宇野 雅博, 小林 聖

    電子情報通信学会技術研究報告. RCS, 無線通信システム112 ( 286 ) 43 - 48   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    筆者らはこれまで,vector perturbationに基づく下りリンク非線形マルチユーザMIMO-OFDMシステムに関して,小セル環境における適用効果の評価,ならびにその実用化に向けた課題克服のための技術検討を行っている.本稿では計算機シミュレーション,ならびに開発したマルチユーザMIMO実験システムを用いた屋内伝送実験による性能評価結果を示すと共に,実用化に向けた課題について述べる.

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  • 小セル環境への適用に向けた非線形マルチユーザMIMOシステムの研究開発 : 効果と実用化に向けた課題

    矢野 一人, 薗部 聡司, 候 亜飛, 塚本 悟司, 伴 弘司, 宇野 雅博, 小林 聖

    電子情報通信学会技術研究報告. A・P, アンテナ・伝播112 ( 285 ) 49 - 54   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    筆者らはこれまで,vector perturbationに基づく下りリンク非線形マルチユーザMIMO-OFDMシステムに関して,小セル環境における適用効果の評価,ならびにその実用化に向けた課題克服のための技術検討を行っている.本稿では計算機シミュレーション,ならびに開発したマルチユーザMIMO実験システムを用いた屋内伝送実験による性能評価結果を示すと共に,実用化に向けた課題について述べる.

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  • Vector perturbationにおける拡大信号点空間上の信号点シンメトリ配置の提案

    薗部 聡司, 塚本 悟司, 前田 隆宏, 侯 亜飛, 矢野 一人, 宇野 雅博, 小林 聖

    電子情報通信学会技術研究報告. RCS, 無線通信システム112 ( 286 ) 85 - 90   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    下りリンクMU-MIMOの非線形プリコーディング方式の一種であるvector perturbationは,線形プリコーディング方式と比較して伝搬路相関が大きい場合でもスループットの低下を抑えることができるが,受信側のmodulo演算の境界の設定誤差が大きい場合十分に性能が発揮できない.本提案方式では,これを克服するために,vector perturbationの拡大信号点空間にシンメトリ性を導入し,判定誤りが大きくなるmodulo境界近傍の両側で同じシンボルを配置するものとした.計算機シミュレーションによりBER特性の評価を行い,その効果を確認した.

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  • 空間フィルタリング重みがvector perturbationを用いたマルチユーザMIMO伝送の性能に与える影響

    矢野 一人, 薗部 聡司, 侯 亜飛, 塚本 悟司, 宇野 雅博, 小林 聖

    電子情報通信学会技術研究報告. RCS, 無線通信システム112 ( 239 ) 189 - 194   2012年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本稿では,8×8下りリンクマルチユーザMIMO-OFDM伝送において,空間フィルタリングにzero-forcing(ZF)重みならびにMMSE重みを用いたvector perturbation(VP)に基づくプリコーディングの効果を,3GPP Release 10下りリンクをベースにしたフレームフォーマットおよびWINNER II A1 LOS伝搬路を仮定した計算機シミュレーションにより評価している.そして,MMSE重みを用いたVPはZF重みを用いたVPよりも送信信号ベクトルのノルムを低減でき,適切に受信側でmodulo格子サイズを設定できれば高いsum-rateが得られること,プリコーディング誤差等により無視できないストリーム間干渉が存在する状況では,プリコーディング後の所望波成分のみならず,ストリーム間干渉成分を考慮してmodulo格子サイズを設定する必要があることを確認している.

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  • マルチユーザMIMO-OFDM伝送の時変伝搬路におけるMMSE受信導入効果

    矢野一人, 薗部 聡司, 侯 亜飛, 宇野 雅博, 小林 聖

    2012年信学ソ大 Sep   421 - 421   2012年

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • フィードバック情報量制限が下りリンク線形・非線形マルチユーザMIMOの性能へ与える影響

    薗部 聡司, 侯 亜飛, 矢野 一人, 宇野 雅博, 上羽 正純

    電子情報通信学会技術研究報告. RCS, 無線通信システム111 ( 12 ) 65 - 70   2011年4月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    本稿では,下りリンクマルチューザMIMO-OFDMシステム上でチャネル情報フィードバックの情報量削減手法としてOFDM信号のサブバンド化を行い,それが線形・非線形マルチューザMIMOアルゴリズムに与える影響の評価を行った.さらに,受信側で計測した伝搬路推定値をそのまま上りリンクの送信シンボルとして送り返すアナログフィードバック方式を用い,同様に評価を行った.有相関チャネルモデル上で計算機シミュレーションの結果,フィードバック情報量をサブバンド数50へ制限した際には,線形・非線形アルゴリズムともに周波数利用効率が劣化傾向となり,特に線形アルゴリズムの飽和周波数利用効率では劣化が大きいことが明らかとなった.さらに,アナログフィードバックを適用した際には,ディジタルフィードバックに対してフィードバック情報量を1/3〜1/4程度に削減しながら,非線形アルゴリズムのVP, BD-VPの周波数利用効率が大きく改善した.特にBD-VPでは高ライスフアクタ,高SNRで飽和周波数利用効率の改善が見られた.

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産業財産権

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受賞

  • IEEE ICACT 2021 Outstanding Paper Award

    2021年2月   IEEE ICACT 2021 委員会  

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  • 2020年度 電子情報通信学会 通信ソサイエティ 活動功労賞

    2020年9月   電子情報通信学会 通信ソサイエティ  

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  • 通信ソサイエティ論文賞

    2020年5月   電子情報通信学会  

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  • 通信ソサイエティ論文賞

    2017年5月   電子情報通信学会  

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  • IEEE GCCE Excellent 5 Years TPC Service Award

    2016年10月   IEEE GCCE 2016 委員会  

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  • IEEE Broadcast Technology Society

    2016年6月   2016 BTS Distinguished Volunteer Award

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  • 通信ソサイエティ論文賞

    2016年5月   電子情報通信学会  

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  • 平成26年度ATR発明考案賞 「漏洩同軸ケーブルを用いた大容量MIMO伝送技術」

    2015年3月   株式会社 国際電気通信基礎技術研究所  

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  • メダル受賞

    2015年1月   IEEE関西支部  

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  • IEEE GCCE 2014 Excellent Paper Award 1st Prize

    2014年10月   IEEE Consumer Electronics Society  

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  • 平成24年度 ATR優秀研究賞 「非線形マルチユーザMIMO技術の実用化研究と性能の実証」

    2014年3月   株式会社 国際電気通信基礎技術研究所  

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  • IEEE ICACT 2013 Outstanding Paper Award

    2013年1月   IEEE ICACT 2013 委員会  

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共同研究・競争的資金等の研究

  • 無線マルチホップネットワークにおける過負荷通信の研究

    研究課題/領域番号:21K04061  2021年04月 - 2024年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    田野 哲, 侯 亜飛, 上原 一浩, 冨里 繁

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    担当区分:研究分担者 

    配分額:4160000円 ( 直接経費:3200000円 、 間接経費:960000円 )

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

    2021年04月 - 2022年03月

    公益財団法人 電気通信普及財団  2020年度研究調査助成  研究調査助成

    侯 亜飛

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    担当区分:研究代表者 

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  • 2D/3D indoor localization using multiple leaky coaxial cables over irregular wireless coverage environment.

    研究課題/領域番号:20K04484  2020年04月 - 2023年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    侯 亜飛, 上原 一浩, 冨里 繁, 田野 哲

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

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  • 過負荷MIMO無線通信システムのための線形受信器の研究

    2020年04月 - 2022年03月

    公益財団法人 電気通信普及財団  2019年度研究調査助成  研究調査助成

    田野 哲、 侯 亜飛

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    担当区分:研究分担者 

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  • 狭空間における周波数稠密利用のための周波数有効利用技術の研究開発

    2017年10月 - 2021年03月

    総務省  電波資源拡大のための研究開発 

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    担当区分:研究分担者 

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  • スマートフォンアプリケーションによる斜面崩壊検出センサネットワーク構築技術の研究開発

    2015年07月 - 2016年03月

    総務省  戦略的情報通信研究開発推進事業(SCOPE) 

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    担当区分:研究代表者 

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  • 超高速移動時の無線通信速度向上に向けた受信点移動型等化技術の研究開発

    2013年09月 - 2014年03月

    総務省  戦略的情報通信研究開発推進事業(SCOPE) 

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    担当区分:研究分担者 

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  • 漏洩同軸ケーブルによる高密度配置リニアセルMIMO システムの研究開発

    2013年04月 - 2015年03月

    総務省  創造的情報通信技術研究開発推進制度(SCOPE) 

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    担当区分:研究分担者 

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  • M2M型動的無線通信ネットワーク構築技術の研究開発

    2012年09月 - 2015年03月

    総務省  電波資源拡大のための研究開発 

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    担当区分:研究分担者 

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  • 非線形マルチユーザMIMO技術の研究開発

    2010年10月 - 2013年03月

    総務省  電波資源拡大のための研究開発 

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    担当区分:研究分担者 

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担当授業科目

  • イノベーション概論 (2020年度) 後期  - 月7,月8,金7,金8

  • イノベーション概論 (2020年度) 後期  - 月7~8,金7~8

  • 工学基礎実験実習 (2020年度) 1・2学期  - 火4,火5,火6,火7

  • 工学基礎実験実習 (2020年度) 1・2学期  - 火4,火5,火6,火7

  • 特別講義 (2020年度) 特別  - その他

  • 特別講義Ⅱ (2020年度) 特別  - その他

  • 特別講義I (2020年度) 特別  - その他

  • 電子情報システム工学特別研究 (2020年度) 通年  - その他

  • 電気通信系実験B (2020年度) 3・4学期  - 水2,水3,水4,水5,水6

  • 電気通信系実験Ⅱ (2020年度) 3・4学期  - 水2,水3,水4,水5,水6

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