Masahiro UMEHIRA


Improving Performance by Countering Human Body Shadowing in 60GHz Band Wireless Systems by Using Two Transmit and Two Receive Antennas
Tomoaki NAGAYAMA Shigeki TAKEDA Masahiro UMEHIRA Kenichi KAGOSHIMA Teruyuki MIYAJIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/02/01
Vol. E99-B  No. 2  pp. 422-429
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
60GHz bandshadowinghuman bodyarray antenna
 Summary | Full Text:PDF(2.6MB)

Feasibility of Guard Band Utilization for Cognitive Radio Using TV White Space
Noriyuki YAGINUMA Masahiro UMEHIRA Hiroshi HARADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/02/01
Vol. E97-B  No. 2  pp. 343-349
Type of Manuscript:  Special Section PAPER (Special Section on Technologies for Effective Utilization of Spectrum White Space)
Category: 
Keyword: 
Cognitive RadioWhite SpaceISDB-TGuard Band
 Summary | Full Text:PDF(2.3MB)

Design and Performance of Overlap FFT Filter-Bank for Dynamic Spectrum Access Applications
Motohiro TANABE Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/04/01
Vol. E95-B  No. 4  pp. 1249-1255
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Heterogeneous Wireless Networks in Conjunction with Main Topics of CrownCom2011)
Category: 
Keyword: 
dynamic spectrum accessoverlap FFTfilter-bankadjacent channel interference
 Summary | Full Text:PDF(1.4MB)

A Novel Dynamic Channel Access Scheme Using Overlap FFT Filter-Bank for Cognitive Radio
Motohiro TANABE Masahiro UMEHIRA Koichi ISHIHARA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3589-3596
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Spectrum Allocation
Keyword: 
dynamic spectrum accesschannel accessoverlap FFTfilter-bank
 Summary | Full Text:PDF(1.1MB)

Recent Japanese R&D in Satellite Communications
Masahiro UMEHIRA Kiyoshi KOBAYASHI Yoshitsugu YASUI Masato TANAKA Ryutaro SUZUKI Hideyuki SHINONAGA Nobuyuki KAWAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/11/01
Vol. E92-B  No. 11  pp. 3290-3299
Type of Manuscript:  INVITED PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2008)
Category: 
Keyword: 
satellite communicationsR&DJapan
 Summary | Full Text:PDF(4.7MB)

Interference Analysis from Impulse Radio UWB Systems Using Simple Signal Models
Yasuo SUZUKI Ichihiko TOYODA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/11/01
Vol. E88-A  No. 11  pp. 3092-3099
Type of Manuscript:  Special Section PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
UWBimpulse radiointerferenceDirac delta functionkurtosisGaussian noise
 Summary | Full Text:PDF(553.7KB)

Implementation and Performance Evaluation of Simple SDM-COFDM Prototype Using Propagation Coefficient Matrix Tracking for Fast Fading MIMO Channels
Takatoshi SUGIYAMA Satoshi KUROSAKI Daisei UCHIDA Yusuke ASAI Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 58-65
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Space Division Multiplexing
Keyword: 
SDMOFDMMIMOZFfrequency utilization efficiency
 Summary | Full Text:PDF(1.8MB)

25 GHz Band Active Integrated Antenna for Broadband Mobile Wireless Access Systems
Tomohiro SEKI Fusao NUNO Takeo ATSUGI Masahiro UMEHIRA Junji SATO Takashi ENOKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/08/01
Vol. E86-C  No. 8  pp. 1520-1526
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: 
Keyword: 
active integrated antennaMSL/slot transitionspatial power combining schemesbroadband mobile wireless accessquasi-millimeter and millimeter-wave frequency band
 Summary | Full Text:PDF(566.9KB)

A SDM-COFDM Scheme Employing a Simple Feed-Forward Inter-Channel Interference Canceller for MIMO Based Broadband Wireless LANs
Satoshi KUROSAKI Yusuke ASAI Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 283-290
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
SDM-COFDMMIMOpropagation matrixlikelihood-weightingsoft decision Viterbi decoding
 Summary | Full Text:PDF(1.6MB)

OFDM/CDMA Technologies for Future Broadband Mobile Communication Systems
Masahiro UMEHIRA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/12/01
Vol. E85-A  No. 12  pp. 2804-2812
Type of Manuscript:  INVITED PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMAOFDMSDMMIMOlink adaptation
 Summary | Full Text:PDF(3.8MB)

Software Defined Radio Prototype for PHS and IEEE 802.11 Wireless LAN
Hiroyuki SHIBA Takashi SHONO Yushi SHIRATO Ichihiko TOYODA Kazuhiro UEHARA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/12/01
Vol. E85-B  No. 12  pp. 2694-2702
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
software defined radio (SDR)PHSwireless LANmultiprocessor architectureover-the-air download
 Summary | Full Text:PDF(2.4MB)

PRIME ARQ: A Novel ARQ Scheme for High-Speed Wireless ATM
Atsushi OHTA Masafumi YOSHIOKA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 474-483
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
ARQwireless ATMquality of service (QoS)selective repeat ARQerror compensation
 Summary | Full Text:PDF(9.1MB)

A Path Loss Model in Residential Areas Based on Measurement Studies Using a 5.2-GHz/2.2-GHz Dual Band Antenna
Naoki KITA Shuta UWANO Akio SATO Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 368-376
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
2.2 GHz5.2 GHz5.2-GHz/2.2-GHz dual band antennapath lossresidential areas
 Summary | Full Text:PDF(1.3MB)

FOREWORD
Susumu YOSHIDA Fumiyuki ADACHI Jun HORIKOSHI Masahiro UMEHIRA Shingo OHMORI Yasutaka OGAWA Takahiko OGINO Tadashi FUJINO Yukitsuna FURUYA Koichi HONMA Yasushi YAMAO Yoshihide YAMADA Fumio WATANABE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 355-358
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(549.9KB)

Design and Performance of ATM Wireless Access Prototype
Hideaki MATSUE Masahiro UMEHIRA Takehiro MURASE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1731-1739
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
wirelessaccessATMmultimediaAWAportable terminal
 Summary | Full Text:PDF(503.1KB)

Linearized Constant Peak-Power Coded OFDM Transmission for Broadband Wireless Access Systems
Shuta UWANO Yoichi MATSUMOTO Masato MIZOGUCHI Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1932-1938
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
OFDMPAPRnonlinear distortionpredistorterout-of-band emission
 Summary | Full Text:PDF(602.7KB)

Dynamic Time-Slot Assignment Schemes for TDMA-Based Wireless ATM
Makoto UMEUCHI Atsushi OHTA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/08/25
Vol. E80-B  No. 8  pp. 1182-1191
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Computing)
Category: 
Keyword: 
ATMwireless accessTDMAtime-slot assignment
 Summary | Full Text:PDF(741.2KB)

A Novel FEC Scheme for Differentially Detected QPSK Signals in Mobile Computing Using High-Speed Wireless Access
Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/08/25
Vol. E80-B  No. 8  pp. 1153-1159
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Computing)
Category: 
Keyword: 
mobile computinghigh-speed wireless accessdifferential detectionnonredundant error correctiondouble symbol errorparallel encoding random FECrician fading
 Summary | Full Text:PDF(540.1KB)

New DQPSK Simultaneous Carrier and Bit-Timing Recovery Coherent Demodulator for Wireless Broadband Communication Systems
Yoichi MATSUMOTO Takeyuki NAGURA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/08/25
Vol. E80-B  No. 8  pp. 1145-1152
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Computing)
Category: 
Keyword: 
coherent demodulatorcarrier recoverybit-timing recoveryDQPSKbroadband communication
 Summary | Full Text:PDF(632KB)

Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery SchemeApplication to Wireless ATM Systems
Yoichi MATSUMOTO Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/07/25
Vol. E80-A  No. 7  pp. 1175-1182
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Network)
Category: 
Keyword: 
coherent detectioncarrier recoverbit-timing recoveryOQPSKwireless ATM
 Summary | Full Text:PDF(607.2KB)

A New AFC Circuit Employing Double-Product Type Frequency Discriminator in Very-Low CNR Environments
Nobuaki MOCHIZUKI Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/01/25
Vol. E80-B  No. 1  pp. 25-32
Type of Manuscript:  Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Modem and Coding
Keyword: 
multimedia satellite communicationhigh coding gain FECvery-low CNR environmentsAFCdouble-product type frequency discriminatorclick noise
 Summary | Full Text:PDF(603KB)

Reverse Modulation Carrier Recovery for Offset QPSK Burst Signals
Masahiro UMEHIRA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/04/25
Vol. E78-B  No. 4  pp. 616-624
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
satellite communicationoffset QPSKcarrier recoveryreverse modulationburst
 Summary | Full Text:PDF(672.7KB)