Koichi OKAWA


Field Experiments on Pilot Symbol-Assisted Coherent Multistage Interference Canceller in DS-CDMA Reverse Link
Kenichi HIGUCHI Koichi OKAWA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 181-190
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
mobile radio communicationDS-CDMAinterference cancellertransmit power controlchannel estimation
 Summary | Full Text:PDF(1.6MB)

Experiments on Parallel-Type Coherent Multistage Interference Canceller with Iterative Channel Estimation for W-CDMA Mobile Radio
Yoshihisa KISHIYAMA Koichi OKAWA Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/12/01
Vol. E84-A  No. 12  pp. 3000-3011
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
mobile radioW-CDMAparallel-type coherent multistage interference cancelleriterative channel estimationdecision-feedback data symbol
 Summary | Full Text:PDF(2.1MB)

Outer Loop Control of Fast Transmit Power Control Based on Intermediate Block Error Rate in Concatenated Channel Coding for DS-CDMA Mobile Radio
Koichi OKAWA Kenichi HIGUCHI Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/07/01
Vol. E84-A  No. 7  pp. 1691-1701
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
mobile radioW-CDMAconcatenated channel codingtransmit power controlouter loop control
 Summary | Full Text:PDF(2.1MB)

Experimental Evaluation of Coherent Rake Combining for Broadband Single-Carrier DS-CDMA Wireless Communications
Takehiro IKEDA Koichi OKAWA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 415-424
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
wireless communicationbroadband DS-CDMARake combiningtransmit power control
 Summary | Full Text:PDF(864.1KB)

Parallel-Type Coherent Multi-Stage Interference Canceller with Iterative Channel Estimation Using Both Pilot and Decision-Feedback Data Symbols for W-CDMA Mobile Radio
Koichi OKAWA Kenichi HIGUCHI Mamoru SAWAHASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 446-456
Type of Manuscript:  Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21st Century)
Category: 
Keyword: 
mobile radioW-CDMAparallel-type coherent multistage interference cancelleriterative channel estimationdecision-feedback data symbol
 Summary | Full Text:PDF(1.3MB)

Path Search Performance and Its Parameter Optimization of Pilot Symbol-Assisted Coherent Rake Receiver for W-CDMA Mobile Radio
Satoru FUKUMOTO Koichi OKAWA Kenichi HIGUCHI Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/11/25
Vol. E83-A  No. 11  pp. 2110-2119
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
mobile radio communicationDS-CDMARake receiverpath search
 Summary | Full Text:PDF(3MB)

Experiments on 2-Mbps Data Transmission Applying Antenna Diversity Reception over 5-MHz W-CDMA Mobile Radio Link
Koichi OKAWA Satoru FUKUMOTO Kenichi HIGUCHI Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1602-1609
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
mobile radioW-CDMA2-Mbps data transmissionantenna diversityTPC
 Summary | Full Text:PDF(1.5MB)

1. 92 Mbps Data Transmission Experiments over a Coherent W-CDMA Radio Link
Koichi OKAWA Yukihiko OKUMURA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/07/25
Vol. E81-B  No. 7  pp. 1330-1336
Type of Manuscript:  Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
wideband CDMAmobile radioorthogonal multicode transmission
 Summary | Full Text:PDF(648.5KB)

Orthogonal Forward Link Using Orthogonal Multi-Spreading Factor Codes for Coherent DS-CDMA Mobile Radio
Koichi OKAWA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/04/25
Vol. E81-B  No. 4  pp. 777-784
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
DS-CDMAforward linkorthogonal spreading codesmobile radio
 Summary | Full Text:PDF(658.9KB)