Akihisa USHIROKAWA


Likelihood Function for QRM-MLD Suitable for Soft-Decision Turbo Decoding and Its Performance for OFCDM MIMO Multiplexing in Multipath Fading Channel
Hiroyuki KAWAI Kenichi HIGUCHI Noriyuki MAEDA Mamoru SAWAHASHI Takumi ITO Yoshikazu KAKURA Akihisa USHIROKAWA Hiroyuki SEKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 47-57
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: MIMO
Keyword: 
MIMOOFCDMQR decompositionmaximum likelihood detectionturbo coding
 Summary | Full Text:PDF(1.7MB)

Performance Evaluation of CDMA Adaptive Interference Canceller with RAKE Structure Using Developed Testbed in Multiuser and Multipath Fading Environment
Hironori MIZUGUCHI Shousei YOSHIDA Akihisa USHIROKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/11/25
Vol. E81-A  No. 11  pp. 2311-2318
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
DS-CDMAadaptive interference canceller (AIC)near-far resistance transmission power control (TPC)
 Summary | Full Text:PDF(713.6KB)

Principles of Turbo Codes and Their Application to Mobile Communications
Akihisa USHIROKAWA Toshihiko OKAMURA Norifumi KAMIYA Branka VUCETIC 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/07/25
Vol. E81-A  No. 7  pp. 1320-1329
Type of Manuscript:  INVITED PAPER (Special Section on Fundamentals of Multi-dimensional Mobile Information Network)
Category: 
Keyword: 
Turbo codesiterative decodingMAPSOVAmobile communication
 Summary | Full Text:PDF(864.6KB)

Performance Evaluation on Power Control and Diversity of Next-Generation CDMA System
Hironori MIZUGUCHI Akio AOYAMA Shousei YOSHIDA Akihisa USHIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/07/25
Vol. E81-B  No. 7  pp. 1345-1354
Type of Manuscript:  Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
IMT-2000CDMA/FDDtransmission power control (TPC)space diversitypath diversity
 Summary | Full Text:PDF(931KB)

CDMA-AIC: Highly Spectrum-Efficient CDMA Cellular System Based on Adaptive Interference Cancellation
Shousei YOSHIDA Akihisa USHIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/03/25
Vol. E79-B  No. 3  pp. 353-360
Type of Manuscript:  Special Section PAPER (Special Issue on Advanced Adaptive Radio Communication Technologies)
Category: Modulation, Demodulation
Keyword: 
personal communicationCDMA-AIC cellularadaptive interference cancellercode-orthogonalizing filtercoherent detector
 Summary | Full Text:PDF(666.2KB)

A Fast Tracking Adaptive MLSE for TDMA Digital Cellular Systems
Kazuhiro OKANOUE Akihisa USHIROKAWA Hideho TOMITA Yukitsuna FURUYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/05/25
Vol. E77-B  No. 5  pp. 557-565
Type of Manuscript:  Special Section PAPER (Special Issue on Adaptive Signal Processing in Mobile Radio Communications)
Category: 
Keyword: 
inter symbol interferencestime-varying fading channel adaptive equalizationautomatic gain controllerchannel tracking algorithm
 Summary | Full Text:PDF(715.6KB)