Yusuke ASAI


User Equipment Centric Downlink Access in Unlicensed Spectrum for Heterogeneous Mobile Network
Riichi KUDO B. A. Hirantha Sithira ABEYSEKERA Yusuke ASAI Takeo ICHIKAWA Yasushi TAKATORI Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/10/01
Vol. E98-B  No. 10  pp. 1969-1977
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
heterogeneous networkCSMA/CAunlicensed spectrumwireless LANRXOPhidden terminal problem
 Summary | Full Text:PDF(3.4MB)

Maximum Likelihood Demodulators and Their Evaluations on Amplify-and-Forward Cooperative OFDM-Based Wireless LAN Systems
Hayato FUKUZONO Yusuke ASAI Riichi KUDO Koichi ISHIHARA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/11/01
Vol. E97-B  No. 11  pp. 2435-2448
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
cooperative communicationorthogonal frequency division multiplexing (OFDM)wireless local area network (LAN)amplify-and-forward (AF) modeGolden codeAlamouti codelog likelihood ratio
 Summary | Full Text:PDF(2.7MB)

Implementation and Evaluation of Real-Time Distributed Zero-Forcing Beamforming for Downlink Multi-User MIMO Systems
Tomoki MURAKAMI Koichi ISHIHARA Riichi KUDO Yusuke ASAI Takeo ICHIKAWA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2521-2529
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMOinter-cell interferencedistributed systemwireless LAN system
 Summary | Full Text:PDF(4.7MB)

Efficient Hybrid DFE Algorithms in Spatial Multiplexing Systems
Wenjie JIANG Yusuke ASAI Satoru AIKAWA Yasutaka OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/02/01
Vol. E92-A  No. 2  pp. 535-546
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
complexity reductionMIMOspatial multiplexingsignal detection
 Summary | Full Text:PDF(1.1MB)

Tree Based Approximate Optimal Signal Detectors for MIMO Spatial Multiplexing Systems
Wenjie JIANG Yusuke ASAI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/02/01
Vol. E92-B  No. 2  pp. 544-558
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
complexity reductionmaximum likelihood detectionMIMO systemspatial multiplexing
 Summary | Full Text:PDF(2.2MB)

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)

Very Fast Recursion Based Algorithm for BLAST Signal Detection in Spatial Multiplexing Systems
Wenjie JIANG Yusuke ASAI Satoru AIKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/07/01
Vol. E90-B  No. 7  pp. 1773-1779
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
complexity reductionsignal detectionspatial multiplexingV-BLAST
 Summary | Full Text:PDF(371.8KB)

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)

Implementation and Performance Evaluation of Simple SDM-COFDM Prototype Using Propagation Coefficient Matrix Tracking for Fast Fading MIMO Channels
Takatoshi SUGIYAMA Satoshi KUROSAKI Daisei UCHIDA Yusuke ASAI Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 58-65
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: 
SDMOFDMMIMOZFfrequency utilization efficiency
 Summary | Full Text:PDF(1.8MB)

A SDM-COFDM Scheme Employing a Simple Feed-Forward Inter-Channel Interference Canceller for MIMO Based Broadband Wireless LANs
Satoshi KUROSAKI Yusuke ASAI Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 283-290
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
SDM-COFDMMIMOpropagation matrixlikelihood-weightingsoft decision Viterbi decoding
 Summary | Full Text:PDF(1.6MB)