Name

MAEHARA, Fumiaki

Official Title

Professor

Affiliation

(School of Fundamental Science and Engineering)

Contact Information

URL

Web Page URL

http://www.waseda.jp/sem-maehara/

Grant-in-aids for Scientific Researcher Number
80329101

Sub-affiliation

Sub-affiliation

Faculty of Science and Engineering(Graduate School of Fundamental Science and Engineering)

Affiliated Institutes

理工学総合研究センター

兼任研究員 2006-2006

システムLSI研究所

研究員 2008-2010

IT教育研究所

研究員 2008-2010

アンビエントSoC研究所

研究所員 2011-2013

IT・教育研究所

研究所員 2010-2013

理工学術院総合研究所(理工学研究所)

兼任研究員 2006-2018

理工学術院総合研究所(理工学研究所)

兼任研究員 2018-

Educational background・Degree

Educational background

-1993 Waseda University Faculty of Science and Engineering Electronics and Communication Engineering
-1995 Waseda University Graduate School, Division of Science and Engineering Department of Electrical Engineering

Degree

Doctor of Engineering Coursework Waseda University Communication/Network engineering

Career

1995-1999Nippon Telegraph and Telephone Corporation (NTT), Japan
2000-2002Research Associate, School of Science and Engineering, Waseda University, Japan
2002-2005Research Fellow, The Japan Society for the Promotion of Science
2004-2005Visiting Research Fellow, University of Hanover, Germany
2005-2006Visiting Lecturer, The Graduate School of Information, Production and Systems, Waseda University, Japan
2006-2007Assistant Professor, School of Science and Engineering, Waseda University, Japan
2007-2012Associate Professor, School of Science and Engineering, Waseda University, Japan
2012-Professor, School of Science and Engineering, Waseda University, Japan

Academic Society Joined

Institute of Electronics, Information and Communication Engineers (IEICE)

Institute of Electronics, Information and Communication Engineers (IEICE)

Institute of Electronics, Information and Communication Engineers (IEICE)

Institute of Electronics, Information and Communication Engineers (IEICE)

Institute of Electronics, Information and Communication Engineers (IEICE)

Institute of Electronics, Information and Communication Engineers (IEICE) Guest Editor-in-Chief, Special Section on Wideband Systems of IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

Institute of Electronics, Information and Communication Engineers (IEICE) Guest Editor, Special Section on Wideband Systems of IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

Institute of Electronics, Information and Communication Engineers (IEICE)

Award

2nd International Conference on Wireless Communications, Vehicular Technology, Information Theory and Aerospace & Electronic Systems (Wireless Vitae 2011) Best Paper Award

2011/03

Interview Guide

Category
Engineering

Research Field

Keywords

Digital Wireless Communications

Grants-in-Aid for Scientific Research classification

Engineering / Electrical and electronic engineering / Communication/Network engineering

Research interests Career

Wireless communications systems

Individual research allowance

Wireless signal processing

Individual research allowance

Paper

Efficient combination of multi-user MIMO THP and user selection based on spatial orthogonality

Maruko, Tomoki; Yamaguchi, Takahiro; Yoshimura, Tomoki; Tomeba, Hiromichi; Onodera, Takashi; Maehara, Fumiaki

IEEE Wireless Communications and Networking Conference, WCNC 2016-September2016/09-2016/09

DOIScopus

Detail

ISSN:15253511

Outline:© 2016 IEEE.This paper proposes an efficient method for combing multi-user MIMO (MU-MIMO) employing Tomlinson Ha-rashima precoding (THP) with semiorthogonal user selection (SUS). Although the ordering of MU-MIMO THP and SUS create space diversity benefit and multi-user diversity benefit, respectively, a significant computational effort is required, which is expected to be relaxed while retaining the system level performance. The proposed method is inspired by the fact that the ordering calculations of MU-MIMO THP and SUS are commonly based on the spatial orthogonality. If that is the case, the result of the ordering of SUS is fully reused for the ordering of MU-MIMO THP, which can eliminate the calculation process of the ordering of MU-MIMO THP. The effectiveness of the proposed method is demonstrated in comparison with the traditional method with the ordering of MU-MIMO THP by means of computer simulations.

A novel modulo loss suppression scheme employing theoretical BER formula for MU-MIMO THP systems

Nishimura, Kei; Maruko, Tomoki; Tomeba, Hiromichi; Onodera, Takashi; Kubota, Minoru; Maehara, Fumiaki; Takahata, Fumio

2015 IEEE 82nd Vehicular Technology Conference, VTC Fall 2015 - Proceedings 2016/01-2016/01

DOIScopus

Detail

Outline:© 2015 IEEE.This paper proposes a novel modulo loss suppression scheme employing a theoretical BER formula for multi-user multiple-input multiple-output (MU-MIMO) Tomlinson-Harashima Precoding (THP) systems. The main feature of the proposed approach is to control the constellation distance by using the simple theoretical bit error rate (BER) formula in order to overcome the modulo loss. Behind this proposal, there is an interesting fact that the BER performance is dependent on the influence of both the thermal noise and the modulo loss and that its influence is determined by the constellation distance. In the proposed approach, we newly derive a theoretical simple BER formula for MU-MIMO THP and then find out the optimal constellation distance to suppress the modulo loss. The effectiveness of the proposed scheme is demonstrated in comparison to the traditional MU-MIMO THP with fixed distance by means of computer simulations.

Antenna decision method for downlink multiuser MIMO systems with receive antenna allocation

Murakami, Tomoki; Takatori, Yasushi; Mizoguchi, Masato; Maehara, Fumiaki

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) 2015-Octoberp.304 - 3052015/10-2015/10

DOIScopus

Detail

ISSN:15223965

Outline:© 2015 IEEE.This paper proposes an antenna decision method for downlink multiuser MIMO (MU-MIMO) with receive antenna allocation per subcarrier. When receive antenna allocation is used, each receiver requires the information of the antenna allocation before receiving the data; for this an overhead signal is used. The proposed method decreases the overhead by deciding an antenna with comparison of received power at each antenna of the receiver. Computer simulations show that the proposed method offers highly accurate antenna decision and high channel capacity with one OFDM symbol.

BS-2-6 Study on Packet Transmission Technique for Non-linear MU-MIMO Transmission

TOMEBA Hiromichi;YOSHIMURA Tomoki;ONODERA Takashi;MAEHARA Fumiaki;TAKAHATA Fumio

Proceedings of the Society Conference of IEICE 2015(1) p."S - 41"-"S-42"2015/08-2015/08

CiNii

OFDM Clipping and Filtering Method Employing Theoretical SNDR-Based Transmit Power Control

TAKEBUCHI Shoya;OSADA Gen;ARAI Takuto;KAMIYA Naokuni;MAEHARA Fumiaki

The transactions of the Institute of Electronics, Information and Communication Engineers. B 97(2) p.216 - 2282014/02-2014/02

CiNii

Detail

ISSN:13444697

A cross-layer switching of OFDMA and MU-MIMO for future WLAN systems

Murakami Tomoki;Takatori Yasushi;Mizoguchi Masato;Maehara Fumiaki

IEICE ComEX 3(9) p.263 - 2682014-2014

CiNii

Detail

ISSN:2187-0136

Outline:We propose a cross-layer switching method of orthogonal frequency division multiple access (OFDMA) and multiuser multiple input multiple output (MU-MIMO) for the future wireless local area network systems. The proposed method, employed on the medium access control layer, switches between OFDMA and MU-MIMO as the transmission method after processing by using physical layer information such as an overhead of channel state information feedback, station number, and data length in order to improve the transmission efficiency. Simulation results show that the proposed method achieves higher total throughput than conventional OFDMA or MU-MIMO where switching is not performed.

Theoretical Derivation Method of Bit Error Rate in MB-OFDM UWB

TAKEBUCHI Shoya;KANEKO Ryouhei;MAEHARA Fumiaki

The Transactions of the Institute of Electronics, Information and Communication Engineers. A 96(5) p.273 - 2772013/05-2013/05

CiNii

Detail

ISSN:09135707

Multi-User MIMO Transmission Scheme Employing Redundant Degrees of Freedom

SHIRAI Toru;TAKEBUCHI Shoya;MAEHARA Fumiaki

The transactions of the Institute of Electronics, Information and Communication Engineers. B 96(5) p.551 - 5542013/05-2013/05

CiNii

Detail

ISSN:13444697

Significance of Theoretical Analysis in Wireless Systems and its Fascination

MAEHARA Fumiaki

IEICE Fundamentals Review 7(1) p.60 - 712013-2013

CiNii

Detail

ISSN:1882-0875

Outline:The transmission performance of wireless systems depends on the radio propagation as well as the modulation scheme and signal-to-noise ratio. Therefore, it is essential to evaluate the transmission performance under the radio propagation specified by the target wireless system. Considering the performance evaluation, the theoretical approach is expected to be more attractive than computer simulation because the theoretical approach gives an overview of the transmission performance thanks to being formulated using essential system parameters. We explain the theoretical derivation method of the transmission performance using a simple radio propagation model and then introduce some examples of the theoretical derivation for MIMO and OFDM, which have been widely adopted for recent wireless systems.

A novel clipping and filtering method employing transmit power control for OFDM systems

S. Takebuchi, T. Arai, F. Maehara

Proc. IEEE Wireless Communications and Networking Conference 2012 (WCNC2012) (PHY08) 2012/04-

DOI

Multi-User MIMO transmission scheme aiming to exploit transmit diversity benefit

T. Shirai, M. Shimizu, F. Maehara

Proc. World Telecommunications Congress 2012 (WTC2012) (PS-22) 2012/03-

Performance evaluation of OFDM clipping and filtering method using transmit power control

S. Takebuchi, T. Arai, F. Maehara

Proc. World Telecommunications Congress 2012 (WTC2012) (PS-25) 2012/03-

Coverage performance of UWB in-car wireless communication in the presence of multiple terminals

T. Arai, T. Shirai, Y. Watanabe, F. Maehara

Proc. 2012 IEEE Radio and Wireless Symposium (RWW2012) p.111 - 1142012/01-

DOI

Theoretical BER Controlled Transmission Mode Selection Method for OFDM ISI Suppression Scheme Using Periodic Signals

FUKUI Tatsuya;YAMAKITA Akihiro;MAEHARA Fumiaki

The transactions of the Institute of Electronics, Information and Communication Engineers. B 95(1) p.48 - 602012/01-2012/01

CiNii

Detail

ISSN:13444697

An application of Time Division Multiplexing on multi-user MIMO THP systems in the presence of high mobility terminals

Y. Wang, M. Shimizu, F. Maehara, F. Takahata

Proc. 2011 IEEE 74th Vehicular Technology Conference (VTC2011-Fall) 2011/09-

Theoretical Derivation Method of BER Performance for OFDM Systems in the Presence of Nonlinear Distortion

YAMAKITA Akihiro;KAMIYAMA Akira;GOTO Yuichiro;MAEHARA Fumiaki

The Transactions of the Institute of Electronics, Information and Communication Engineers. A 94(9) p.723 - 7332011/09-2011/09

CiNii

Detail

ISSN:09135707

Bit Metric Derivation Method Using Residual CCI Signals for Adaptive Antenna Array Coupled with Channel Coding

WANG Yunhan;MAEHARA Fumiaki;TAKAHATA Fumio;ONODERA Takashi;URABE Shuuji

The transactions of the Institute of Electronics, Information and Communication Engineers. B 94(8) p.959 - 9692011/08-2011/08

CiNii

Detail

ISSN:13444697

Simple series form formula of BER performance for M-ary QAM/OFDM signals with MRC diversity reception over nonlinear fading channels

A. Yamakita, A. Kamiyama, Y. Goto, F. Maehara

Proc. 2nd International Conference on Wireless Communications, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology (Wireless VITAE2011) 2011/03-

Nonlinear suppression scheme employing transmit power control for MIMO-OFDM systems

T. Arai, Y. Wang, N. Kamiya, F. Maehara

Proc. 2nd International Conference on Wireless Communications, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology (Wireless VITAE2011) 2011/03-

A Coverage area prediction method using theoretical BER formula for in-car MB-OFDM UWB communication

Y. Watanabe, R. Kaneko, A. Yamakita, F. Maehara

Proc. The 10th International Conference on ITS Telecommunications (ITST 2010) TH1-32010/11-

An adaptive SC-FDE transmission enhancing frequency diversity benefit

R. Kaneko, Y. Wang, F. Maehara

Proc. 2010 IEEE 11th International Symposium on Spread Spectrum Techniques and Applications (ISSSTA 2010) p.45 - 492010/10-

OFDM nonlinear distortion suppression scheme for MIMO system

T. Arai, N. Kamiya, F. Maehara

Proc. 2010 Asia-Pacific Radio Science Conference (AP-RASC'10) CP-92010/09-

Coverage performance of 480Mbps MB-OFDM UWB in-car communication

Y. Arai, R. Kaneko, F. Maehara

Proc. 2010 Asia-Pacific Radio Science Conference (AP-RASC'10) CBDEFK2-62010/09-

The effectiveness of bit metric derivation method using residual CCI power in post-FFT type OFDM adaptive array

Y. Wang, F. Maehara, F. Takahata

Proc. 15th International OFDM Workshop 2010 (InOWo'10) p.120 - 1242010/09-

AS-1-4 Coverage Area Performance of In-car MB-OFDM UWB Communication

YAMAKITA Akihiro;WATANABE Yuki;KANEKO Ryouhei;MAEHARA Fumiaki

Proceedings of the Society Conference of IEICE 2010p."S - 7"-"S-8"2010/08-2010/08

CiNii

Coverage performance of MB-OFDM UWB In-car wireless communication

F. Maehara, R. Kaneko, A. Yamakita, S. Goto

Proc. IEEE, IET International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP2010) p.465 - 4692010/07-

Coverage area prediction method of extremely reliable in-car MB-OFDM UWB communication

R. Kaneko, A. Yamakita, F. Maehara

Proc. IEEE International Symposium on Wireless Vehicular Communications (WIVEC 2010) 2010/05-

Permutation Network for Reconfigurable LDPC Decoder Based on Banyan Network

Peng, Xiao;Chen, Zhixiang;Zhao, Xiongxin;Maehara, Fumiaki;Gotto, Satoshi

IEICE TRANSACTIONS ON ELECTRONICS E93C(3) p.270 - 2782010-2010

DOIWoS

Detail

ISSN:0916-8524

Generic Permutation Network for QC-LDPC Decoder

Peng, Xiao;Zhao, Xiongxin;Chen, Zhixiang;Maehara, Fumiaki;Goto, Satoshi

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E93A(12) p.2551 - 25592010-2010

DOIWoS

Detail

ISSN:0916-8508

Coverage area prediction of in-car wireless communications employing MB-OFDM UWB systems

R. Kaneko, F. Maehara

Proc. The 9th International Conference on ITS Telecommunications (ITST2009) p.667 - 6722009/10-

Performance of bit metric derivation method using CCI signals for OFDM adaptive array antenna

Y. Wang, F. Maehara, F. Takahata, T. Onodera, S. Urabe

Proc. Asia-Pacific Conference of Communications (APCC2009) p.174 - 1772009/10-

Simple series form formula of BER performance for DQPSK/OFDM signals in time selective nonlinear fading channels

A. Yamakita, Y. Goto, F. Maehara

Proc. The 12th International Symposium on Wireless Personal Multimedia Communications (WPMC2009) S242009/09-

Nonlinear distortion avoidance employing symbol-wise transmit power control for OFDM transmission

N. Kamiya, F. Maehara

Proc. 14th International OFDM Workshop 2009 (InOWo'09) p.223 - 2272009/09-

Simple Series Form Formula of BER Performance for DBPSK/OFDM Signals in Time Selective Nonlinear Fading Channels

A. Yamakita, Y. Goto, F. Maehara

Proc. IEEE Pacific Rim Conference on Communications, Computers and Signal Processing p.205 - 2102009/08-

Closed form expression for BER performance of Decode-and-Forward relaying over different time selective fading channel

S. Uchida, F. Sasamori, F. Maehara

Proc. ITC-CSCC2009 p.1354 - 13572009/07-

Performance comparison of bit metric derivation method for OFDM adaptive array

Y. Wang, F. Maehara

Proc. ITC-CSCC2009 p.916 - 9192009/07-

Simple series form formula of BER performance of M-ary QAM/OFDM signals over nonlinear fading channels

Y. Goto, A. Yamakita, F. Maehara

Proc. The 7th International Workshop on Multi-Carrier Systems & Solutions (MC-SS 2009) p.281 - 2902009/05-

Theoretical derivation of bit error rate in MB-OFDM UWB system

R. Kaneko, F. Maehara

Proc. Wireless Telecommunications Symposium (WTS 2009) 2009/04-

New bit metric derivation method for adaptive array antenna with channel coding

F. Maehara, F. Takahata

Proc. WPMC 2008 2008/09-

同一チャネル干渉下におけるCOFDMシステム用軟判定ゆう度情報生成法

平明徳,冠美恵子,前原文明,高畑文雄

電子情報通信学会論文誌B Vol. J91-B(No. 5) p.575 - 5842008/05-

適応フィルタによるガードバンドの外挿処理を施したOFDM用周波数領域伝搬路推定法

池田裕司,吉田晴人,平明徳,前原文明,高畑文雄

電子情報通信学会論文誌B Vol. J91-B(No. 4) p.450 - 4562008/04-

鉄橋を渡る列車と畳込みの関係

前原文明

電子情報通信学会通信ソサイエティマガジン (No. 4) p.212008/03-

Simple series form formula of BER performance for DQPSK/OFDM signals in comprehensive nonlinear fading channels

F. Maehara, A. Taira, F. Takahata

Proc. IEEE Radio and Wireless Symposium 2008 p.37 - 402008/01-

A soft bit metric calculation method against co-channel interference in COFDM systems

A. Taira, M. Kammuri, F. Maehara, F. Takahata

Proc. WPMC 2007 p.828 - 8322007/12-

OFDM link adaptation scheme using periodic signals under inter-symbol interference channels

F. Maehara, A. Taira, F. Takahata

Proc. 12th International OFDM-Workshop 2007 (InOWo'07) p.321 - 3252007/08-

Periodic spectrum transmission for single-carrier transmission frequency-domain equalization

F. Maehara, S. Goto, F. Takahata

IEICE Trans. Commun. Vol. E90-B(No.6) p.1407 - 14142007/06-

Channel estimation and interference cancellation for MIMO-OFDM systems

V. D. Nguyen, M. Paetzold, F. Maehara, H. Haas, M. V. Pham

IEICE Trans. Commun. Vol. E90-B(No.2) p.277 - 2902007/02-

Iterative decision feedback channel estimation using metrics comparison for burst mode COFDM transmission

H. Yoshida, F. Maehara, F. Takahata

IEICE Trans. Commun. Vol. E89-B(No.12) p.3475 - 34782006/12-

Performance of periodic spectrum transmission for single-carrier with frequency-domain equalization using channel coding

T. Kuriyama, H. Yoshida, A. Taira, F. Maehara, F. Takahata

Proc. 1st International Conference on Communications and Electronics (ICCE 2006) 2006/10-

Frequency-domain channel estimation scheme using RLS-Based guard band channel frequency response extrapolation for OFDM systems

Y. Ikeda, H. Yoshida, F. Maehara, F. Takahata

Proc. WPMC 2006 p.302 - 3062006/09-

Adaptive forgetting factor control scheme for decision feedback channel estimation in COFDM transmission

H. Yoshida, F. Maehara, F. Takahata

Proc. 11th International OFDM-Workshop 2006 (InOWo'06) p.218 - 2222006/08-

Inter-symbol interference suppression scheme using periodic signal waveform for fixed-rate COFDM systems

F. Maehara, S. Goto, F. Takahata

Proc. IEEE VTC2006-Spring 2006/05-

Periodic spectrum transmission for single-carrier frequency-domain equalization employing space-time transmit diversity

H. Yoshida, T. Kuriyama, F. Maehara, F. Takahata

Proc. IEEE ISWPC 2006 F1-32006/01-

バーストの両端にパイロットシンボルを配置したCOFDM伝送におけるメトリック比較を用いたフェージング補償法

吉田晴人,前原文明,高畑文雄

電子情報通信学会論文誌(B) Vol. J88-B(No. 10) p.2119 - 21222005/10-

Inter-symbol interference suppression employing sub-carrier group selection for OFDM-TDD transmit diversity

F. Maehara,T. Ikenaga, F. Takahata, S. Goto

Proc. IEEE ISWCS 2005 2005/09-

Closed form expression of average bit error rate for TDD transmit diversity employing maximal ratio combining

F. Maehara

IEICE Trans. Commun. Vol. E88-B(No. 5) p.2136 - 21412005/05-

Series form expression of BER performance for DQPSK/OFDM signals employing selection combining diversity reception over nonlinear fading channels

F. Maehara

Proc. IEEE VTC2005-Spring 2005/05-

A dual-mode decision feedback channel estimation over fast fading channels for COFDM transmission

H. Yoshida, F. Maehara, F. Takahata

Proc. IASTED International Conference on Networks and Communication Systems (NCS 2005) p.457 - 4612005/04-

Performance comparison of carrier Interferometry OFDM and OFDM using space diversity reception and channel Coding

F. Maehara, H.-P. Kuchenbecker

IEICE Trans. Commun. Vol. E87-B(No.12) p.3801 - 38082004/12-

Inter-symbol interference suppression scheme employing sub-carrier group selection for fixed-rate OFDM systems

F. Maehara, H.-P. Kuchenbecker

Proc. 9th International OFDM-Workshop 2004 (InOWo'04) 2004/09-

Frequency diversity application to single-carrier transmission with frequency-domain equalization

F. Maehara, H.-P. Kuchenbecker

Proc. WPMC 2004 Vol.1p.324 - 3282004/08-

Performance of diversity reception for coded carrier interferometry OFDM

F. Maehara, H.-P. Kuchenbecker

Proc. IEEE VTC2004-Spring 2004/05-

Inter-symbol interference suppression scheme using even-numbered sub-carriers for fixed-rate OFDM systems

F. Maehara, F. Sasamori, F. Takahata

IEICE Trans. Commun. Vol. E87-B(No.4) p.866 - 8722004/04-

A novel design of transmit diversity using space-time block Ccoding for coded carrier interferometry OFDM

F. Maehara, H.-P. Kuchenbecker,

Proc. First IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) p.98 - 1022004/01-

Approximate expression of BER performance in DS-CDMA systems over multi-path fading channels

F. Sasamori, S. Handa, F. Maehara, F. Takahata and S. Oshita

IEICE Trans. Commun. Vol. E86-B(No.8) p.2523 - 25282003/08-

Inter-symbol interference suppression scheme using even-numbered sub-carriers for OFDM systems

F. Maehara, F. Sasamori, F. Takahata

Proc. IST Mobile & Wireless Communications Summit 2003 Vol. 1p.83 - 872003/06-

Approximate equation of average bit-error rate in DS-CDMA systems over fading channels

F. Sasamori, F. Maehara, S. Handa, S. Oshita and F. Takahata

IEEE Trans. Commun. Vol. 51(No.3) p.409 - 4152003/03-

Approximate equation of bit error rate in OFDM systems over specular multipath fading channels

F. Sasamori, A. Yamano, S. Handa, F. Maehara, F. Takahata, S. Ohshita

Proc. IEEE WCNC 2003 TS78-22003/03-

Linear predictive maximal ratio combining transmitter diversity for OFDM-TDMA/TDD systems

F. Maehara, F. Sasamori, F. Takahata

IEICE Trans. Commun. Vol. E86-B(No. 1) p.221 - 2292003/01-

OFDM伝送におけるSIR重み付け受信ダイバーシチ

前原文明,栗田明,笹森文仁,高畑文雄

電子情報通信学会論文誌(B) Vol. J85-B(No. 12) p.2399 - 24032002/12-

高速フェージング環境下におけるOFDM伝送を対象としたフェージング補償方式

吉田晴人,前原文明,笹森文仁,高畑文雄

電子情報通信学会論文誌(B) Vol. J85-B(No. 11) p.1874 - 18832002/11-

Theoretical derivation method of bit error rate in maximal ratio combining TDD transmitter diversity

F. Maehara, F. Sasamori, F. Takahata

Proc. IEEE MWCN 2002 2002/09-

Theoretical derivation method of bit error rate in TDMA/TDD transmitter diversity under cochannel interference

F. Maehara, F. Sasamori, F. Takahata

IEICE Trans. Commun. Vol. E85-B(No. 3) p.663 - 6662002/03-

2波隣接チャネル干渉に起因するBPSK-BER特性の解析的近似導出法

山田智紀,斎藤朋彰,前原文明,高畑文雄

電子情報通信学会論文誌(B) Vol. J85-B(No. 3) p.417 - 4232002/03-

Approximate equation of bit error rate in DQPSK/OFDM systems over fading channels

F. Sasamori, H. Umeda, S. Handa, F. Maehara, F. Takahata, S. Ohshita

Proc. European Wireless 2002 Vol. 1p.602 - 6072002/02-

OFDM伝送における非線形歪みの再帰的処理に基づく補償法

細野博之, 細川泰輔, 前田毅, 前原文明, 高畑文雄

電子情報通信学会論文誌(B) Vol. J85-B(No. 1) p.9 - 192002/01-

TDMA/TDD送信ダイバーシチにおける希望信号レベルに基づく最大比合成法の効果

前原文明, 高畑文雄

電子情報通信学会論文誌(B) Vol. J84-B(No. 11) p.2062 - 20662001/11-

New derivation method of BPSK bit error rate performance in cochannel interference

F. Maehara, T. Saito, F. Takahata

IEICE Trans. Commun. Vol. E84-B(No.9) p.2701 - 27042001/09-

Linear predictive maximal ratio combining transmitter diversity for broadband wireless communications systems

F. Maehara, F. Takahata

Proc. WPMC 2001 p.1065 - 10702001/09-

A transmitter diversity with desired signal power using matched filter

F. Maehara, F. Sasamori, and F. Takahata

IEICE Trans.Commun. Vol. E84-B(No.2) p.255 - 2622001/02-

SIR weighting combining diversity using matched filter for personal communication systems

F. Maehara, O. Nakamura, H. Takanashi

Wireless Personal Communications, Kluwer Academic Publishers Vol. 15(Issue 3) p.181 - 1972000/12-

New Derivation Methods of BER Performance in Channel Interference of PSK signals

F. Maehara, T. Saito, F. Takahata

Proc. IEEE ICPWC 2000 p.123 - 1272000/12-

Derivation Method of BER Performance in Adjacent Channel Interference and Cochannel Interference of PSK signals

T. Yamada, D. Ikuta, F. Maehara, F. Takahata

Proc. APCC 2000 Vol. 2p.1102 - 11062000/11-

ディジタル移動通信におけるSIR重み付け合成ダイバーシチ

前原文明, 笹森文仁, 高畑文雄

電子情報通信学会論文誌(B) Vol. J83-B(No. 10) p.1374 - 13802000/10-

Theoretical Performance of Bit Error Rate in TDMA/TDD Transmitter Diversity under Cochannel Interference

F. Maehara, F. Sasamori, F. Takahata

Proc. ISAP 2000 Vol. 4p.1489 - 14922000/08-

周波数選択性レイリーフェージング環境下におけるDS-CDMA方式の平均ビット誤り率の近似的導出法

笹森文仁, 前原文明, 高畑文雄

電子情報通信学会論文誌(B) Vol. J83-B(No. 7) p.960 - 9692000/07-

16値QAM変調方式を適用した広帯域陸上移動通信用復調器

境田博,前原文明,高畑文雄

電子情報通信学会論文誌(B-II) Vol.J79-B-II(No. 8) p.431 - 4401996/08-

Inter-symbol interference suppression scheme employing periodic signals in network MIMO-OFDM systems

Suganuma, Hirofumi; Maruko, Tomoki; Maehara, Fumiaki

ISAP 2016 - International Symposium on Antennas and Propagation p.276 - 2772017/01-2017/01

Scopus

Detail

Outline:© 2016 IEICE. This paper proposes an inter-symbol interference (ISI) suppression scheme employing periodic signals for network MIMO-OFDM systems. Network MIMO-OFDM suffers from the ISI due to long time difference of arrival (TDOA) among the users especially in large cells. In the proposed scheme, the periodic signals generated by only the even-numbered sub-carriers is adopted for suppressing the ISI and the appropriate transmission mode is chosen between the traditional non-periodic and periodic signals based on the theoretical BER obtained by means of correlation operation. The proposed approach makes the most of the useful properties that a certain ISI-affected user does not interfere at all with the other users, which enables us to make the counter-measure individually. The effectiveness of the proposed method is demonstrated in comparison with the traditional non-periodic transmission by means of computer simulations.

Downlink multiuser MIMO-OFDM transmission using simple receive antenna selection

Murakami, Tomoki; Ujihara, Keisuke; Takatori, Yasushi; Mizoguchi, Masato; Maehara, Fumiaki

ISAP 2016 - International Symposium on Antennas and Propagation p.604 - 6052017/01-2017/01

Scopus

Detail

Outline:© 2016 IEICE. This paper proposes a downlink MU-MIMO-OFDM transmission using simple receive antenna selection. In the proposal, base station transmits to users with selected receive antenna per subcarrier to obtain diversity gain. The proposal also decreases computational complexity by narrowing down the number of antenna combination in accordance with correlation value between receive antennas at each user. From experimental evaluations, it is indicated that the proposal offers high channel capacity with greatly reduced antenna combination.

Theoretical Shannon capacity performance of nonlinearly amplified uplink OFDMA signals in the presence of terminal mobility

Yamaguchi, Takahiro; Nishimura, Kei; Maehara, Fumiaki

IEEE Vehicular Technology Conference 2017/03-2017/03

DOIScopus

Detail

ISSN:15502252

Outline:© 2016 IEEE. This paper proposes the theoretical derivation method of the Shannon capacity for nonlinearly amplified uplink Orthogonal Frequency Division Multiple Access (OFDMA) in the presence of terminal mobility. In our theoretical derivation, the impact of the intercarrier interference (ICI) arising from terminal mobility as well as the multiuser interference (MUI) caused by nonlinear amplification of the mobile stations (MSs) on OFDMA signals is taken into account. Considering the fact that these interferences differ with the sub-carrier allocation methods such as localized FDMA (LFDMA) and interleaved FDMA (IFDMA), we derive the probability density function (PDF) of the instantaneous signal-to-noise-plus-distortion-plus-interference ratio (SNDIR) for each sub-carrier allocation method. Since the SNDIR is successfully expressed in the closed form, the proposed formula enables us to evaluate the Shannon capacity without conducting time consuming computer simulations.

A simple CoMP transmission method employing vehicle position information for taxi radio systems

Kurihara, Naoki; Ujihara, Keisuke; Maehara, Fumiaki

Proceedings - 2017 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet 2017 p.73 - 752017/03-2017/03

DOIScopus

Detail

Outline:© 2017 IEEE. This paper proposes a simple coordinated multipoint (CoMP) transmission method for taxi radio systems in order to prevent inter-cell interference (ICI) without a significant renewal of facilities. The proposed method takes advantage of the interesting property that the ICI which is essential for CoMP can be represented by the communication distance easily obtained from vehicle position information in a 2-cells scenario. Moreover, the proposed approach can be adopted for more than 3 cells by combining the ICI between 2 cells. The proposed method exploits diversity reception in the case of time division multiplexing (TDM), which makes it possible to improve the channel capacity in overlapped area. The effectiveness of the proposed method is demonstrated in comparison with the case of no coordination (w/o CoMP) under the practical scenario based on the taxi radio system in Japan.

An enhanced MMSE subchannel decision feedback equalizer with ICI suppression for FBMC/OQAM systems

Chen, Chih Wei; Maehara, Fumiaki

2017 International Conference on Computing, Networking and Communications, ICNC 2017 p.1041 - 10452017/03-2017/03

DOIScopus

Detail

Outline:© 2017 IEEE. This paper proposes an enhanced decision feedback equalizer (DFE) for filter bank multicarrier (FBMC) systems over offset quadrature amplitude modulation (OQAM) based on a minimal mean square error (MMSE) criterion. For each subcarrier, besides one feedforward (FF) filter and one feedback (FB) filter, we add two intercarrier interference (ICI)-suppressing filters, which feed back detected precursors extracted from neighboring subchannels to enhance ICI suppression in the presence of multipath channels. Our simulation results indicate our proposal makes a considerable improvement comparing with MMSE-DFE under a severe ICI and ISI scenario despite few extra costs in computational complexity.

Inter-symbol interference suppression scheme employing periodic signals in coded network MIMO-OFDM systems

Suganuma, Hirofumi; Saito, Shuhei; Maruko, Tomoki; Maehara, Fumiaki

IEEE Radio and Wireless Symposium, RWS p.42 - 442017/03-2017/03

DOIScopus

Detail

ISSN:21642958

Outline:© 2017 IEEE. This paper proposes an inter-symbol interference (ISI) suppression scheme employing periodic signals for network MIMO-OFDM systems. Network MIMO-OFDM suffers from the ISI due to long time difference of arrival (TDOA) especially in large cells. In the proposed scheme, the periodic signals generated by only the even-numbered sub-carriers are adopted for ISI-affected users while the traditional non-periodic signals are used for ISI-free users. Moreover, to realize the transmission mode selection between the periodic and non-periodic signals, the theoretical derivation method of the BER is newly derived considering the impact of channel coding. The effectiveness of the proposed method is demonstrated in comparison with the traditional non-periodic transmission by means of computer simulations.

Performance of adaptive movable access point system in the presence of positioning error

Oka, Shingo; Murakami, Tomoki; Takatori, Yasushi; Mizoguchi, Masato; Maehara, Fumiaki

IEEE Radio and Wireless Symposium, RWS p.150 - 1522017/03-2017/03

DOIScopus

Detail

ISSN:21642958

Outline:© 2017 IEEE. This paper proposes an adaptive movable access point (AMAP) system to enhance the system capacity in dense wireless-device environments. In the proposed approach, the positions of access points (APs) are adaptively moved in accordance with clustered user distribution, which is sure to be effective in ununiform user distribution due to dense device environments. In order to derive the appropriate positions of APs, we utilize k-means method and estimate the user's position which is essential for k-means method by means of receive signal strength indicator (RSSI) or time of arrival (ToA). The effectiveness of the proposed systems is evaluated in the presence of the positioning error obtained from the experimental results concerning RSSI and ToA and is demonstrated in comparison with the fixed position of AP with equal intervals.

Efficient Ordering Calculation Method Using Frequency Correlation for MU-MIMO-OFDM THP

Hiruma, Nobuhiro; Maruko, Tomoki; Tomeba, Hiromichi; Onodera, Takashi; Maehara, Fumiaki

IEEE Vehicular Technology Conference 2017-June2017/11-2017/11

DOIScopus

Detail

ISSN:15502252

Outline:© 2017 IEEE. This paper proposes an efficient ordering calculation method employing frequency correlation in multiuser multiple-input multiple-output orthogonal frequency division multiplexing (MU-MIMO-OFDM) Tomlinson Harashima Precoding (THP). Although the ordering process is effective to improve the transmission performance of THP, it requires a large amount of computational effort due to sub-carrier-based operation. To cope with this problem, the proposed method thins out the sub-carriers conducting the ordering process based on the frequency correlation. The basic idea behind this proposal is that the ordering results are considered to be the same among the neighboring sub-carriers in a relatively small delay spread. Moreover, the frequency correlation is derived from a delay profile which can be determined by multiple transmit antennas. The effectiveness of the proposed method is demonstrated in terms of calculation cost and the bit error rate (BER) by comparing with the traditional MU-MIMO-OFDM THP without thinning.

Books And Publication

ディジタル無線通信入門

高畑文雄,前原文明,笹森文仁

培風館2002/06-

Patent

Reference Number:871

通信システムおよび通信方法(日本)

髙畑 文雄, 前原 文明

2008-198093、2010- 41075、5053200

Reference Number:872

受信装置、通信システムおよび受信方法(日本)

髙畑 文雄, 前原 文明

2008-198092、2010- 41074

Reference Number:951

通信装置及び通信システム(日本)

髙畑 文雄, 前原 文明

2009- 37705、2010-193350

Reference Number:1244

送信装置、受信装置および通信システム(日本)

髙畑 文雄, 前原 文明

2011-274542、2013-126144

Reference Number:1491

無線通信システム、無線通信装置及び無線通信方法(日本)

前原 文明

2014- 20500、2015-149556、6098980

Reference Number:1510

無線通信装置及び無線通信方法(日本)

前原 文明

2014- 34301、2015-159498、6108554

Reference Number:1623

無線通信方法および無線通信装置(日本)

前原 文明

2015-029495、2016-152535、6319768

Reference Number:1938

無線通信システム、集中制御局および可動基地局配置方法(日本)

前原 文明

2017-154584、2019- 33435

Reference Number:295-JP

送信装置、受信装置および通信システム(日本)

前原 文明, 髙畑 文雄

2014-554552、6280508

Research Grants & Projects

Grant-in-aids for Scientific Research Adoption Situation

Research Classification:

Research on robust SC-FDE transmission over time selective fading channels

2013/-0-2016/-0

Allocation Class:¥4810000

Research Classification:

Theoretical Derivation Method of Bit Error Rate for OFDM Signals over Nonlinear Channels

Allocation Class:¥3870000

Research Classification:

Application of Laguerre-Gaussian beams to optical wireless communications

2017/-0-2020/-0

Allocation Class:¥4680000

Research Classification:

Research on system capacity enhancement using network MIMO-OFDM for mobile communications

2016/-0-2019/-0

Allocation Class:¥4810000

On-campus Research System

Special Research Project

移動通信のためのネットワーク MIMO-OFDMによる通信容量拡大に関する研究

2017

Research Results Outline:In this work, we proposed the inter-symbolinterference suppression method eIn this work, we proposed the inter-symbolinterference suppression method employing compressed sensing for OFDM systemswhich...In this work, we proposed the inter-symbolinterference suppression method employing compressed sensing for OFDM systemswhich can be seen as a promising transmission technique in 5th generation (5G)mobile networks. The feature of the proposed approach is to demodulate thelatter part of the time domain OFDM symbol by using compressed sensing underthe assumption of sparse subcarrier allocation. Numerical results by means ofcomputer simulation showed that the superiority of the proposed method over thetradition method using FFT demodulation can be found in the mid-range delayspread.

Lecture Course

Course TitleSchoolYearTerm
Introduction to Computer Science and Communications EngineeringSchool of Fundamental Science and Engineering2019spring semester
Introduction to Computer Science and Communications Engineering [S Grade]School of Fundamental Science and Engineering2019spring semester
Computer Science and Engineering Laboratory A (2)School of Fundamental Science and Engineering2019fall semester
Computer Science and Engineering Laboratory A [S Grade]School of Fundamental Science and Engineering2019fall semester
Computer Science and Engineering Laboratory BSchool of Fundamental Science and Engineering2019spring semester
Computer Science and Engineering Laboratory B [S Grade]School of Fundamental Science and Engineering2019spring semester
Bachelor Thesis ASchool of Fundamental Science and Engineering2019full year
Bachelor Thesis A [S Grade]School of Fundamental Science and Engineering2019full year
Bachelor Thesis BSchool of Fundamental Science and Engineering2019full year
Bachelor Thesis B [S Grade]School of Fundamental Science and Engineering2019full year
Project Research ASchool of Fundamental Science and Engineering2019spring semester
Project Research BSchool of Fundamental Science and Engineering2019fall semester
Information Theory ASchool of Fundamental Science and Engineering2019spring semester
Information Theory ASchool of Fundamental Science and Engineering2019spring semester
Information Theory A [S Grade]School of Fundamental Science and Engineering2019spring semester
Communication TheorySchool of Fundamental Science and Engineering2019fall semester
Communication TheorySchool of Fundamental Science and Engineering2019fall semester
Communication Theory [S Grade]School of Fundamental Science and Engineering2019fall semester
Communications and Computer Engineering Laboratory ASchool of Fundamental Science and Engineering2019fall semester
Communications and Computer Engineering Laboratory A [S Grade]School of Fundamental Science and Engineering2019fall semester
Communications and Computer Engineering Laboratory BSchool of Fundamental Science and Engineering2019spring semester
Communications and Computer Engineering Laboratory B [S Grade]School of Fundamental Science and Engineering2019spring semester
Communications and Computer Engineering Laboratory CSchool of Fundamental Science and Engineering2019fall semester
Communications and Computer Engineering Laboratory C [S Grade]School of Fundamental Science and Engineering2019fall semester
Bachelor Thesis ASchool of Fundamental Science and Engineering2019full year
Bachelor Thesis A [S Grade]School of Fundamental Science and Engineering2019full year
Bachelor Thesis BSchool of Fundamental Science and Engineering2019full year
Bachelor Thesis B [S Grade]School of Fundamental Science and Engineering2019full year
Project Research ASchool of Fundamental Science and Engineering2019spring semester
Mobile Communications TechnologiesSchool of Fundamental Science and Engineering2019fall semester
Mobile Communications TechnologiesSchool of Fundamental Science and Engineering2019fall semester
Project Research BSchool of Fundamental Science and Engineering2019fall semester
Wireless Signal ProcessingSchool of Fundamental Science and Engineering2019spring semester
Wireless Signal ProcessingSchool of Fundamental Science and Engineering2019spring semester
Wireless Signal ProcessingSchool of Fundamental Science and Engineering2019spring semester
Wireless Signal ProcessingSchool of Fundamental Science and Engineering2019spring semester
Research Project BSchool of Fundamental Science and Engineering2019spring semester
Research Project BSchool of Fundamental Science and Engineering2019spring semester
Research Project BSchool of Fundamental Science and Engineering2019spring semester
Research Project B [S Grade]School of Fundamental Science and Engineering2019spring semester
Research Project CSchool of Fundamental Science and Engineering2019fall semester
Research Project CSchool of Fundamental Science and Engineering2019fall semester
Research Project C [S Grade]School of Fundamental Science and Engineering2019fall semester
Research Project C [S Grade]School of Fundamental Science and Engineering2019fall semester
Research Project ASchool of Fundamental Science and Engineering2019fall semester
Research Project ASchool of Fundamental Science and Engineering2019fall semester
Research Project DSchool of Fundamental Science and Engineering2019spring semester
Research Project DSchool of Fundamental Science and Engineering2019spring semester
Computer Science and Communications Engineering Laboratory ASchool of Fundamental Science and Engineering2019fall semester
Computer Science and Engineering LaboratorySchool of Fundamental Science and Engineering2019fall semester
Computer Science and Engineering LaboratorySchool of Fundamental Science and Engineering2019fall semester
Computer Science and Communications Engineering Laboratory A [S Grade]School of Fundamental Science and Engineering2019fall semester
Introduction to Computers and NetworksSchool of Fundamental Science and Engineering2019spring semester
Master's Thesis (Department of Computer Science and Communications Engineering)Graduate School of Fundamental Science and Engineering2019full year
Research on Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019full year
Research on Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019full year
Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019spring semester
Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019spring semester
Special Laboratory A in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019spring semester
Special Laboratory A in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019spring semester
Special Laboratory B in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019fall semester
Special Laboratory B in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019fall semester
Seminar on Wireless Signal Processing AGraduate School of Fundamental Science and Engineering2019spring semester
Seminar on Wireless Signal Processing AGraduate School of Fundamental Science and Engineering2019spring semester
Seminar on Wireless Signal Processing BGraduate School of Fundamental Science and Engineering2019fall semester
Seminar on Wireless Signal Processing BGraduate School of Fundamental Science and Engineering2019fall semester
Seminar on Wireless Signal Processing CGraduate School of Fundamental Science and Engineering2019spring semester
Seminar on Wireless Signal Processing CGraduate School of Fundamental Science and Engineering2019spring semester
Seminar on Wireless Signal Processing DGraduate School of Fundamental Science and Engineering2019fall semester
Seminar on Wireless Signal Processing DGraduate School of Fundamental Science and Engineering2019fall semester
Master's Thesis (Department of Computer Science and Communications Engineering)Graduate School of Fundamental Science and Engineering2019full year
Research on Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019full year
Research on Wireless Signal ProcessingGraduate School of Fundamental Science and Engineering2019full year
Special Seminar A in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019spring semester
Special Seminar B in Computer Science and Communications EngineeringGraduate School of Fundamental Science and Engineering2019fall semester