Shuji KUBOTA


A New User Selection Measure in Block Diagonalization Algorithm for Multiuser MIMO Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/10/01
Vol. E92-B  No. 10  pp. 3206-3218
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMOuser selectionblock diagonalizationchannel capacity
 Summary | Full Text:PDF

Tree Based Approximate Optimal Signal Detectors for MIMO Spatial Multiplexing Systems
Wenjie JIANG Yusuke ASAI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/02/01
Vol. E92-B  No. 2  pp. 544-558
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
complexity reductionmaximum likelihood detectionMIMO systemspatial multiplexing
 Summary | Full Text:PDF

Antenna Selection Method for Terminal Antennas Employing Orthogonal Polarizations and Patterns in Outdoor Multiuser MIMO System
Naoki HONMA Riichi KUDO Kentaro NISHIMORI Yasushi TAKATORI Atsushi OHTA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1752-1759
Type of Manuscript:  Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation)
Category: Smart Antennas & MIMO
Keyword: 
MIMOmultiuserurban environmentpolarizationpatternantenna selection
 Summary | Full Text:PDF

Proposal of Wireless Traffic Control Schemes for Wireless LANs
Takefumi HIRAGURI Takeo ICHIKAWA Masataka IIZUKA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/05/01
Vol. E91-B  No. 5  pp. 1340-1348
Type of Manuscript:  Special Section PAPER (Special Section on Communication Quality)
Category: QoS Control Mechanism and System
Keyword: 
wireless LANIEEE802.11traffic controlload barancingQoS
 Summary | Full Text:PDF

New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
Yasushi TAKATORI Riichi KUDO Atsushi OHTA Koichi ISHIHARA Kentaro NISHIMORI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2312-2320
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Smart Antennas
Keyword: 
multiuser MIMOuplinkbeamformingfrequency offset
 Summary | Full Text:PDF

New Downlink Beamforming Method for Cooperative Multiple Access Point Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2303-2311
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Smart Antennas
Keyword: 
MIMOdownlinkbeamformingmultiple access point system
 Summary | Full Text:PDF

Proposal for System Diversity on Software Defined Radio
Takashi SHONO Kazuhiro UEHARA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/09/01
Vol. E84-A  No. 9  pp. 2346-2358
Type of Manuscript:  PAPER
Category: Mobile Information Network and Personal Communications
Keyword: 
software defined radioalgorithm diversitysystem diversityQoS
 Summary | Full Text:PDF

An Effective Data Transmission Control Method for Mobile Terminals in Spot Communication Systems
Hiroshi YOSHIOKA Masashi NAKATSUGAWA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/07/25
Vol. E83-A  No. 7  pp. 1328-1337
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
spot communication systemsdata transmission methodintelligent transport systems (ITS)DSRC protocol
 Summary | Full Text:PDF

Software Radio Base and Personal Station Prototypes
Yasuo SUZUKI Kazuhiro UEHARA Masashi NAKATSUGAWA Yushi SHIRATO Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/06/25
Vol. E83-B  No. 6  pp. 1261-1268
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio and Its Technologies)
Category: 
Keyword: 
softwaresoftware radiodigital signal processorpersonal handy phone system
 Summary | Full Text:PDF

High Capacity and Wide Coverage Cell Station for Personal Communication Systems
Kiyoshi KOBAYASHI Tomoaki KUMAGAI Shuji KUBOTA Shigeaki OGOSE Takeshi HATTORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/01/25
Vol. E82-B  No. 1  pp. 112-119
Type of Manuscript:  PAPER
Category: Communication Systems and Transmission Equipment
Keyword: 
personal communicationcell stationdiversitycoherent detectionburst-by-burst AFC
 Summary | Full Text:PDF

Bit-Stream-Arranged Weighted Modulation Scheme for Low Delay Spread Frequency Selective Fading Channels
Kiyoshi KOBAYASHI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/07/25
Vol. E81-A  No. 7  pp. 1452-1458
Type of Manuscript:  Special Section PAPER (Special Section on Fundamentals of Multi-dimensional Mobile Information Network)
Category: 
Keyword: 
weighted modulationfrequency selective fadingmicro-cell systemADPCMPCM
 Summary | Full Text:PDF

Bit Significance Selective Frequency Diversity Transmission
Tomoaki KUMAGAI Kiyoshi KOBAYASHI Katsuhiko KAWAZOE Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/03/25
Vol. E81-B  No. 3  pp. 545-552
Type of Manuscript:  PAPER
Category: Communication Theory
Keyword: 
frequency diversityspectrum efficiencyfadingADPCM
 Summary | Full Text:PDF

An FFT Interference Detection Scheme for Interference Suppression in Digital Satellite Communication Systems
Takatoshi SUGIYAMA Masanobu SUZUKI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/09/25
Vol. E80-B  No. 9  pp. 1352-1362
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
digital satellite communicationco-channel interferenceinterference suppressionnotch filterFECFFT
 Summary | Full Text:PDF

Fully Digital Burst Modem for Satellite Multimedia Communication Systems
Kiyoshi KOBAYASHI Tetsu SAKATA Yoichi MATSUMOTO Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/01/25
Vol. E80-B  No. 1  pp. 8-15
Type of Manuscript:  Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Modem and Coding
Keyword: 
digital burst modemTDMAsatellite communicationVLSIC
 Summary | Full Text:PDF

A Time Division Multiple Access-Time Division Duplex combined with an Alternated Frequency Duplexer for Wireless Personal Communications
Katsuhiko KAWAZOE Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/11/25
Vol. E79-B  No. 11  pp. 1688-1695
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
TDMATDDFDDfadingdiversitymicrocell
 Summary | Full Text:PDF

A Half-Chip Offset QPSK Modulation CDMA Scheme Employing Differential Detection for Advanced Wireless LAN Systems
Takatoshi SUGIYAMA Masato MIZOGUCHI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/05/25
Vol. E79-B  No. 5  pp. 693-700
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
offset QPSK-CDMAnonlinear channeldifferential detectionforward error correctiontime diversityfrequency utilization efficiency
 Summary | Full Text:PDF

A Reliable Packet Transmission Method for TDMA Based Wireless Multimedia Communications
Katsuhiko KAWAZOE Yoshihisa SUGIMURA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/03/25
Vol. E79-B  No. 3  pp. 251-256
Type of Manuscript:  Special Section PAPER (Special Issue on Advanced Adaptive Radio Communication Technologies)
Category: Access, Network
Keyword: 
packetmultimediapersonal communicationTDMAfadingdiversity
 Summary | Full Text:PDF

An Integrated Interference Suppression Scheme with An Adaptive Equalizer for Digital Satellite Communication Systems
Takatoshi SUGIYAMA Masanobu SUZUKI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/02/25
Vol. E79-B  No. 2  pp. 191-197
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
satellite communicationco-channel interferenceinterference suppressionnotch filterFECadaptive equalizer
 Summary | Full Text:PDF

Open Loop Reverse Modulation Carrier Recovery Scheme for Rician and Rayleigh Fading Environments
Tetsu SAKATA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/01/25
Vol. E79-B  No. 1  pp. 45-51
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
radio communicationcarrier recoveryopen loopreverse modulationanti-fading
 Summary | Full Text:PDF

Phase Ambiguity Resolver for PCM Sound Broadcasting Satellite Service with Low Power Consumption Viterbi Decoder Employing SST Scheme
Kazuhiko SEKI Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/09/25
Vol. E78-B  No. 9  pp. 1269-1277
Type of Manuscript:  PAPER
Category: Communication Systems and Transmission Equipment
Keyword: 
phase ambiguityViterbi decoderPCM sound broadcastingcommunication satellites
 Summary | Full Text:PDF

Ultra-High-Speed and Universal-Coding-Rate Viterbi Decoder VLSIC--SNUFEC VLSI--
Katsuhiko KAWAZOE Shunji HONDA Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1994/12/25
Vol. E77-C  No. 12  pp. 1888-1894
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia, Analog and Processing LSIs)
Category: Multimedia System LSIs
Keyword: 
FECViterbi decodingconvolutional encodingVLSICsatellite communication systems
 Summary | Full Text:PDF

VLSI Implemented 60 Mb/s QPSK/OQPSK Burst Digital Demodulator for Radio Application
Yoichi MATSUMOTO Kiyoshi KOBAYASHI Tetsu SAKATA Kazuhiko SEKI Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1994/12/25
Vol. E77-C  No. 12  pp. 1873-1880
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia, Analog and Processing LSIs)
Category: Multimedia System LSIs
Keyword: 
demodulatorcarrier recoverybit-timing recoveryVLSITDMA
 Summary | Full Text:PDF

A New Burst Coherent Demodulator for Microcellular TDMA/TDD Systems
Yoichi MATSUMOTO Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/07/25
Vol. E77-B  No. 7  pp. 927-933
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
demodulatorcarrier-recovelyclock-recoverycoherent-detectionTDMA/TDD
 Summary | Full Text:PDF

A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals
Tetsu SAKATA Kazuhiko SEKI Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/07/25
Vol. E77-B  No. 7  pp. 921-926
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
digitalized modulatorπ/4-shift QPSKlow power consumption
 Summary | Full Text:PDF

A Frequency Utilization Ffficiency Improvement on Superposed SSMA-QPSK Signal Transmission over High Speed QPSK Signals in Nonlinear Channels
Takatoshi SUGIYAMA Hiroshi KAZAMA Masahiro MORIKURA Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/05/25
Vol. E76-B  No. 5  pp. 480-487
Type of Manuscript:  Special Section PAPER (Special Issue on Satellite Communications Networking and Applications)
Category: 
Keyword: 
SSMA-QPSK signalshigh speed QPSK signalssuperposed transmissionFECinterference cancellationnon-linear channel
 Summary | Full Text:PDF

A Suitable Combination of Modulation and FEC Schemes for Satellite Digital Video Communication Networks
Shuji KUBOTA Masahiro MORIKURA Kiyoshi ENOMOTO Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/05/25
Vol. E76-B  No. 5  pp. 497-507
Type of Manuscript:  Special Section PAPER (Special Issue on Satellite Communications Networking and Applications)
Category: 
Keyword: 
satellite communicationmodulationFECdigital video communication
 Summary | Full Text:PDF

DSD (Double Soft Decision) Concatenated Forward Error Correction Scheme
Shunji HONDA Shuji KUBOTA Masahiro MORIKURA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1992/08/25
Vol. E75-B  No. 8  pp. 747-754
Type of Manuscript:  Special Section PAPER (Special Issue on the 4th Japan-Korea Joint Conference on Communications, Networks, Switching Systems and Satellite Communications (4th JC-CNSS))
Category: 
Keyword: 
concatenated codessoft decisionViterbi decoding
 Summary | Full Text:PDF