Takeshi ONIZAWA


Path Loss Model for Outdoor-to-Indoor Corridor Up to 40GHz Band in Microcell Environments
Minoru INOMATA Motoharu SASAKI Wataru YAMADA Takeshi ONIZAWA Masashi NAKATSUGAWA Nobutaka OMAKI Koshiro KITAO Tetsuro IMAI Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 242-251
Type of Manuscript:  Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Realization of Next Generation Wireless Systems)
Category: 
Keyword: 
propagation5Goutdoor-to-indoor path loss modelmillimeter wavehigh frequency bandsmicrocell environments
 Summary | Full Text:PDF(2.7MB)

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)

A New Ordered Decision Feedback Equalization Algorithm for Spatial Multiplexing Systems in MIMO Channel
Wenjie JIANG Yusuke ASAI Takeshi ONIZAWA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/11/01
Vol. E90-A  No. 11  pp. 2546-2555
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
BLASTcomplexity reductionorderingsequential detector
 Summary | Full Text:PDF(683.2KB)

Experimental Studies on a Decision-Feedback Channel Tracking Scheme Implemented in FPGA for MIMO-OFDM Systems
Yusuke ASAI Wenjie JIANG Takeshi ONIZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/11/01
Vol. E90-A  No. 11  pp. 2423-2430
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: MIMO-OFDM
Keyword: 
MIMOOFDMchannel trackingchannel estimationDoppler shiftIEEE 802.11nwireless LANframe aggregation
 Summary | Full Text:PDF(1.5MB)

A Simple and Feasible Decision-Feedback Channel Tracking Scheme for MIMO-OFDM Systems
Yusuke ASAI Wenjie JIANG Takeshi ONIZAWA Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/05/01
Vol. E90-B  No. 5  pp. 1052-1060
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Transfer Technologies for the Next Generation Network)
Category: 
Keyword: 
MIMOOFDMchannel trackingchannel estimationDoppler frequencyIEEE 802.11nwireless LANframe aggregation
 Summary | Full Text:PDF(1.4MB)

A Synchronization Scheme for Packet Mode MIMO-OFDM Signals in Wireless LAN
Takeshi ONIZAWA Takafumi FUJITA Yusuke ASAI Daisei UCHIDA Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 92-104
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
wireless LANMIMOOFDMpacket modesynchronization
 Summary | Full Text:PDF(1.4MB)

FPGA Implementation of Eigenbeam MIMO-OFDM for Wireless LAN and Its Experimental Performance
Takeshi ONIZAWA Atsushi OHTA Yusuke ASAI Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/12/01
Vol. E89-B  No. 12  pp. 3233-3241
Type of Manuscript:  Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
software-defined radiofield programmable gate arrayMIMO-OFDMeigenbeamwireless LAN
 Summary | Full Text:PDF(3.5MB)

A Simplified Maximum Likelihood Detector for OFDM-SDM Systems in Wireless LAN
Wenjie JIANG Takeshi ONIZAWA Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Vol. E88-B  No. 6  pp. 2427-2437
Type of Manuscript:  Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
OFDM-SDMMLDZFcomplexity reductionWLAN
 Summary | Full Text:PDF(1.6MB)

A Reduced-Complexity Signal Detection Scheme Employing ZF and K-Best Algorithms for OFDM/SDM
Takafumi FUJITA Atsushi OHTA Takeshi ONIZAWA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 66-75
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: 
OFDMSDMMIMOMLDZero-ForcingK-bestM-algorithmIEEE 802.11a
 Summary | Full Text:PDF(806.4KB)

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 Scheme to Evaluate Cell Throughput of Multi-Rate Wireless LAN Systems with CSMA/CA
Takafumi FUJITA Takeshi ONIZAWA Satoru HORI Atsushi OHTA Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 880-890
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
wireless LANsOFDMCSMA/CAcell throughputsystem capacity
 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 Novel Channel Estimation Scheme Employing Adaptive Selection of Frequency-Domain Filters for OFDM Systems
Takeshi ONIZAWA Masato MIZOGUCHI Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 1923-1931
Type of Manuscript:  Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
wireless LANOFDMQAMcoherent detectionchannel estimationadaptive filterbit shifter
 Summary | Full Text:PDF(387.9KB)

A Novel Coherent Preambleless Demodulator Employing Sequential Processing for PSK Packet Signals--AFC and Carrier Recovery Circuits--
Takeshi ONIZAWA Kiyoshi KOBAYASHI Masahiro MORIKURA Toshiaki TANAKA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/03/25
Vol. E82-B  No. 3  pp. 542-550
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
packetAFCpreamblelessphase signalssequentialcarrier recoverysample hold
 Summary | Full Text:PDF(424.5KB)

A Fast Synchronization Scheme of OFDM Signals for High-Rate Wireless LAN
Takeshi ONIZAWA Masato MIZOGUCHI Masahiro MORIKURA Toshiaki TANAKA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/02/25
Vol. E82-B  No. 2  pp. 455-463
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
wireless LANpacket transmissionOFDMmulti-carrier modulationAFCsymbol timing detectioncarrier frequency error
 Summary | Full Text:PDF(442.1KB)

The Spread Spectrum Code Hopping System
Takeshi ONIZAWA Takaaki HASEGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/07/25
Vol. E78-A  No. 7  pp. 795-804
Type of Manuscript:  Special Section PAPER (Special Section on Mobile Information Network)
Category: 
Keyword: 
spread spectrumcode hoppingcode interferencemobileconsumer
 Summary | Full Text:PDF(692.4KB)