Tetsu SAKATA


Frame Collision Reduction Method Employing Adaptive Transmission Control for IEEE802.11 Wireless LAN System
Akira KISHIDA Masashi IWABUCHI Toshiyuki SHINTAKU Takeshi ONIZAWA Tetsu SAKATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/09/01
Vol. E97-B  No. 9  pp. 1790-1799
Type of Manuscript:  Special Section PAPER (Special Section on Ambient Intelligence and Sensor Networks)
Category: 
Keyword: 
CSMA/CAIEEE802.11collision reductiondenseIFS
 Summary | Full Text:PDF(2.5MB)

A New Simple Packet Combining Scheme Employing Maximum Likelihood Detection for MIMO-OFDM Transmission in Relay Channels
Takeshi ONIZAWA Hiroki SHIBAYAMA Masashi IWABUCHI Akira KISHIDA Makoto UMEUCHI Tetsu SAKATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/05/01
Vol. E97-B  No. 5  pp. 1094-1102
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
relay channeldecode-and-forwardpacket combiningcyclic shift delayMIMO-OFDMMLD
 Summary | Full Text:PDF(4.1MB)

User-Oriented QoS Control Method Based on CSMA/CA for IEEE802.11 Wireless LAN System
Akira KISHIDA Masashi IWABUCHI Toshiyuki SHINTAKU Tetsu SAKATA Takefumi HIRAGURI Kentaro NISHIMORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/02/01
Vol. E96-B  No. 2  pp. 419-429
Type of Manuscript:  Special Section PAPER (Special Section on Quality of Communication Services Improving Quality of Life)
Category: 
Keyword: 
user-orientedQoSfixed backoffCSMA/CAIEEE802.11
 Summary | Full Text:PDF(3.1MB)

A Novel Interference Avoidance Technique on Mobile Wireless Routers Using IEEE802.11n PSMP
Akira KISHIDA Takefumi HIRAGURI Masakatsu OGAWA Kentaro NISHIMORI Naoki HONMA Tetsu SAKATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/08/01
Vol. E93-B  No. 8  pp. 2053-2062
Type of Manuscript:  Special Section PAPER (Special Section on Implementation, Experiments, and Practice for Ad Hoc and Mesh Networks)
Category: 
Keyword: 
IEEE802.11nIEEE802.16emutual system interferencePSMPwireless relay
 Summary | Full Text:PDF(2.2MB)

Power Saving Scheme Suitable for Wireless LAN in Multimedia Communications
Takefumi HIRAGURI Masakatsu OGAWA Makoto UMEUCHI Tetsu SAKATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/09/01
Vol. E92-A  No. 9  pp. 2184-2190
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: Wireless LAN System
Keyword: 
wireless LANpower savingquality of servicemulticastingbroadcasting
 Summary | Full Text:PDF(971.7KB)

A New Very High-Rate Wireless LAN System Employing OFDM and MC/CDMA Signals
Takeshi ONIZAWA Takafumi FUJITA Tetsu SAKATA Masahiro MORIKURA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/05/01
Vol. E87-B  No. 5  pp. 1227-1234
Type of Manuscript:  Special Section PAPER (Special Section on Mobile Multimedia Communications)
Category: Wireless LAN
Keyword: 
wireless LANmultiple-cell environmentuniversal frequency reuseOFDMMC/CDMAfallback
 Summary | Full Text:PDF(1.3MB)

A New Simple Adaptive Phase Tracking Scheme Employing Phase Noise Estimation for OFDM Signals
Takeshi ONIZAWA Masato MIZOGUCHI Tetsu SAKATA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 247-256
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
wireless LANOFDMphase trackingresidual carrier frequency errorphase noise
 Summary | Full Text:PDF(1.9MB)

A New Branch Metric Generation Method for Soft-Decision Viterbi Decoding in Coded OFDM-SDM Systems Employing MLD over Frequency Selective MIMO Channels
Satoru HORI Masato MIZOGUCHI Tetsu SAKATA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1675-1684
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
wireless LANOFDM-SDMMLDViterbi decodebranch metric
 Summary | Full Text:PDF(1.5MB)

A Maximal Ratio Combining Frequency Diversity ARQ Scheme for High-Speed OFDM Systems
Tomoaki KUMAGAI Tetsu SAKATA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1914-1922
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
ARQpacket combiningOFDMfrequency diversitymaximal ratio combining
 Summary | Full Text:PDF(394.1KB)

A New Vector Error Measurement Scheme for Transmit Modulation Accuracy of OFDM Systems
Satoru HORI Tomoaki KUMAGAI Tetsu SAKATA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1906-1913
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
OFDMinter-operabilitytransmit modulation accuracyvector errorpilot signal
 Summary | Full Text:PDF(554.9KB)

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(852.9KB)

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(493.8KB)

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(794.8KB)

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(448.5KB)

A Digitalized Quadrature Modulator for Fast Frequency Hopping
Kazuhiko SEKI Tetsu SAKATA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/05/25
Vol. E77-B  No. 5  pp. 656-662
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
TDMA/TDDmodulatorsynthesizerfrequency hopping
 Summary | Full Text:PDF(601.3KB)