Daisuke UMEHARA


Simplified Maximum Likelihood Detection with Unitary Precoding for XOR Physical Layer Network Coding
Satoshi DENNO Daisuke UMEHARA 
Publication:   
Publication Date: 2017/01/01
Vol. E100-B  No. 1  pp. 167-176
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
physical layer network codingdetection and forward relayforward error correctionmaximum likelihood detectioncomplexity reduction
 Summary | Full Text:PDF(416.9KB)

An Iterative MIMO Receiver Employing Virtual Channels with a Turbo Decoder for OFDM Wireless Systems
Akihito TAYA Satoshi DENNO Koji YAMAMOTO Masahiro MORIKURA Daisuke UMEHARA Hidekazu MURATA Susumu YOSHIDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/05/01
Vol. E98-B  No. 5  pp. 878-889
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiple-input multiple-outputvirtual channelsoft-input soft-outputlog likelihood ratioiterative scheme
 Summary | Full Text:PDF(1.5MB)

Software Radio-Based Distributed Multi-User MIMO Testbed: Towards Green Wireless Communications
Hidekazu MURATA Susumu YOSHIDA Koji YAMAMOTO Daisuke UMEHARA Satoshi DENNO Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/01/01
Vol. E96-A  No. 1  pp. 247-254
Type of Manuscript:  INVITED PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
green wirelessmulti-user MIMOsoftware radiodistributed antenna systemfield experiment
 Summary | Full Text:PDF(2.8MB)

A Least Bit Error Rate Adaptive Array for MultiLevel Modulations
Satoshi DENNO Daisuke UMEHARA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/01/01
Vol. E95-B  No. 1  pp. 69-76
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2010)
Category: Radio Systems
Keyword: 
adaptive arrayadaptive algorithmAPSKerror ratenon-linear equationinterference cancellation
 Summary | Full Text:PDF(643.4KB)

A Virtual Layered Space-Frequency Receiver Architecture with Iterative Decoding
Jun IMAMURA Satoshi DENNO Daisuke UMEHARA Masahiro MORIKURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/07/01
Vol. E94-B  No. 7  pp. 1994-2002
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOOFDMspatial multiplexingiterative decodingsuccessive detection
 Summary | Full Text:PDF(862.5KB)

Enhancement of CSMA/CA and Network Coding in Single-Relay Multi-User Wireless Networks
Chun-Hsiang HUANG Daisuke UMEHARA Satoshi DENNO Masahiro MORIKURA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3371-3380
Type of Manuscript:  Special Section PAPER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
single-relay multi-user networksnetwork codingCSMA/CACWmin optimizationwireless throughputfairness
 Summary | Full Text:PDF(1MB)

A Synchronization Method for Synchronous CDMA Broadband Communication Systems with GEO Satellites
Takuya SAKAMOTO Daisuke UMEHARA Yoshiteru MORIHIRO Makoto KAWAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/08/01
Vol. E87-B  No. 8  pp. 2111-2118
Type of Manuscript:  Special Section PAPER (Special Section on Recent Fundamental Technologies for Broadband Satellite Communications)
Category: 
Keyword: 
synchronous CDMAGEO satellitesynchronization methodKalman filter
 Summary | Full Text:PDF(613.4KB)

One-Point Algebraic Geometric Codes from Artin-Schreier Extensions of Hermitian Function Fields
Daisuke UMEHARA Tomohiko UYEMATSU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/10/25
Vol. E81-A  No. 10  pp. 2025-2031
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
one-point AG codesminimal set of generators of semigroup of nongapsArtin-Schreier extensionsHermitian function fields
 Summary | Full Text:PDF(543.7KB)