Yoshitaka HARA


A Simple Cooperative Relaying with Alamouti Coded Transmission
Tomoya YAMAOKA Yoshitaka HARA Noriyuki FUKUI Hiroshi KUBO Takaya YAMAZATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/02/01
Vol. E95-B  No. 2  pp. 643-646
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
cooperative diversityAlamouti codeABBA code
 Summary | Full Text:PDF(259.6KB)

3-Hop Cooperative Diversity Using Quasi-Orthogonal Space-Time Block Code
Tomoya YAMAOKA Yoshitaka HARA Noriyuki FUKUI Hiroshi KUBO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/06/01
Vol. E93-B  No. 6  pp. 1636-1640
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
cooperative diversitymulti-hopquasi-orthogonal space-time block code
 Summary | Full Text:PDF(192.4KB)

An Efficient Multiuser Relay Scheme for OFDMA Systems
Yoshitaka HARA Hiroshi KUBO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/04/01
Vol. E93-B  No. 4  pp. 938-947
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communicationsOFDMArelaymultiuserscheduling
 Summary | Full Text:PDF(704.2KB)

Antenna Array Calibration Based on Frequency Selection in OFDMA/TDD Systems
Yoshitaka HARA Yasuhiro YANO Hiroshi KUBO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/10/01
Vol. E92-B  No. 10  pp. 3195-3205
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communicationsOFDMATDDcalibrationantenna arraysMIMOchannel reciprocity
 Summary | Full Text:PDF(879.4KB)

Pilot-Based Channel State Feedback in TDD/MIMO Systems with Co-channel Interference
Yoshitaka HARA Kazuyoshi OSHIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/03/01
Vol. E92-B  No. 3  pp. 933-945
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communicationsfeedbackMIMOsignallingbeamformingSINR
 Summary | Full Text:PDF(1.2MB)

Remote Control of Transmit Beamforming for Multiuser TDD/MIMO Systems
Yoshitaka HARA Kazuyoshi OSHIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1922-1931
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
mobile communicationsMIMObeamformingremote controlTDD
 Summary | Full Text:PDF(723.1KB)

Partial CSI Reporting for Spatial Scheduling in Multiuser MIMO Systems
Yoshitaka HARA Kazuyoshi OSHIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/02/01
Vol. E91-B  No. 2  pp. 479-487
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communicationsmultiuser MIMOpartial channel state informationspatial schedulingthroughput
 Summary | Full Text:PDF(707.2KB)

Pilot-Based Channel Quality Reporting for OFDMA/TDD Systems with Cochannel Interference
Yoshitaka HARA Abdel-Majid MOURAD Kazuyoshi OSHIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2532-2540
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communicationsOFDMATDDSINRsignallingchannel quality
 Summary | Full Text:PDF(1MB)

Multiband Mobile Communication System for Wide Coverage and High Data Rate
Yoshitaka HARA Kazuyoshi OSHIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/09/01
Vol. E89-B  No. 9  pp. 2537-2547
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
mobile communicationswireless accessmultibandradio resource controlblocking probability
 Summary | Full Text:PDF(648.6KB)

A Pre-FFT OFDM Adaptive Array Antenna with Eigenvector Combining
Shinsuke HARA Quoc Tuan TRAN Yunjian JIA Montree BUDSABATHON Yoshitaka HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/08/01
Vol. E89-B  No. 8  pp. 2180-2188
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
OFDMadaptive array antennaco-channel interference suppressioneigenvector
 Summary | Full Text:PDF(810.9KB)

Throughput Maximization Transmission Control Scheme for MIMO Systems
Kenji SUTO Yoshitaka HARA Tomoaki OHTSUKI Yoshikazu TAKEI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/10/01
Vol. E88-B  No. 10  pp. 4040-4046
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOthroughputtransmission control
 Summary | Full Text:PDF(476.2KB)

Radio Resource Management and Power Control for W-CDMA Uplink with High Data Rate Packet Transmission
Yoshitaka HARA Kuniyuki SUZUKI Koji KANEKO Takashi SEKIGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/05/01
Vol. E88-B  No. 5  pp. 2102-2109
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
code division multiaccessradio resource managementpower controlpacket transmission
 Summary | Full Text:PDF(954.8KB)

A Frequency Scheduling Method for MC-CDM
Shigehiko TSUMURA Yoshitaka HARA Shinsuke HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/02/01
Vol. E88-B  No. 2  pp. 706-715
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
frequency selective fading channelmulti-carrier code division multiplexing (MC-CDM)multi-user channelresource management
 Summary | Full Text:PDF(667.4KB)

Time Slot Assignment for Cellular SDMA/TDMA Systems with Adaptive Antennas
Yoshitaka HARA Yunjian JIA Toshihisa NABETANI Shinsuke HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 858-865
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
SDMAslot assignmentadaptive arraysland mobile radio cellular systemswireless communication
 Summary | Full Text:PDF(696.7KB)

On a Novel Pre-FFT OFDM Adaptive Antenna Array for Delayed Signal Suppression
Montree BUDSABATHON Shuichi HANE Yoshitaka HARA Shinsuke HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/06/01
Vol. E86-B  No. 6  pp. 1936-1945
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
pre-FFT OFDMadaptive antenna arraydelayed signalmaximum SNIR criterionMMSE criterion
 Summary | Full Text:PDF(669.3KB)

Multiuser Interference Suppression in Uplink Multicarrier CDMA Systems
Chihiro FUJITA Yoshitaka HARA Yukiyoshi KAMIO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/10/01
Vol. E85-A  No. 10  pp. 2256-2262
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Spread Spectrum Technologies and Applications
Keyword: 
multiuser interferencemulticarrier CDMAminimum mean squared error combiningimpulse response
 Summary | Full Text:PDF(631.8KB)

Performance Evaluation of Base Station Antenna Arrays Using Common Correlation Matrix for W-CDMA System under Multipath Fading Environment
Duk-Kyu PARK Yoshitaka HARA Yukiyoshi KAMIO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/12/01
Vol. E84-A  No. 12  pp. 3026-3034
Type of Manuscript:  Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
adaptive arraycorrelation matrixmultipath Rayleigh fading environmentW-CDMA
 Summary | Full Text:PDF(1.2MB)

Data Access Control for CDMA Systems with Adaptive Antennas
Yoshitaka HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/07/01
Vol. E84-B  No. 7  pp. 1816-1822
Type of Manuscript:  Special Section PAPER (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)
Category: Application to CDMA
Keyword: 
CDMAdata access controladaptive antennablocking probabilitycapacity
 Summary | Full Text:PDF(604.4KB)

Time Slot Assignment Algorithms for SDMA/TDMA System Based on Estimated SINR
Yoshitaka HARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/02/01
Vol. E84-B  No. 2  pp. 220-227
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
mobile communicationSDMAslot assignmentadaptive arraycapacity
 Summary | Full Text:PDF(980.1KB)

Upper Bounds on the Average BER of Adaptive Arrays in Fading Environments
Yoshitaka HARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/07/25
Vol. E83-A  No. 7  pp. 1365-1369
Type of Manuscript:  Special Section LETTER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
mobile communicationadaptive arraysaverage BERfading environmentupper bounds
 Summary | Full Text:PDF(397.3KB)