Tatsunori OBARA


Joint Processing of Analog Fixed Beamforming and CSI-Based Precoding for Super High Bit Rate Massive MIMO Transmission Using Higher Frequency Bands
Tatsunori OBARA Satoshi SUYAMA Jiyun SHEN Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/08/01
Vol. E98-B  No. 8  pp. 1474-1481
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part I: Radio Access Technologies and System Design)
Category: 
Keyword: 
5Ghigher frequency bandsMassive MIMOanalog fixed beamformingCSI-based precoding
 Summary | Full Text:PDF(1.6MB)

Interference-Aware Channel Segregation Based Dynamic Channel Assignment for Wireless Networks
Yuki MATSUMURA Katsuhiro TEMMA Ren SUGAI Tatsunori OBARA Tetsuya YAMAMOTO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/05/01
Vol. E98-B  No. 5  pp. 854-860
Type of Manuscript:  PAPER
Category: Network Management/Operation
Keyword: 
channel segregationdynamic channel assignmentco-channel interference
 Summary | Full Text:PDF(1.8MB)

Excess-Bandwidth Transmit Filtering Based on Minimization of Variance of Instantaneous Transmit Power for Low-PAPR SC-FDE
Amnart BOONKAJAY Tatsunori OBARA Tetsuya YAMAMOTO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/04/01
Vol. E98-B  No. 4  pp. 673-685
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
single-carrier transmissiontransmit filteringpeak-to-average power ratio (PAPR)
 Summary | Full Text:PDF(2.8MB)

Analog Single-Carrier Transmission with Frequency-Domain Equalization
Thanh Hai VO Shinya KUMAGAI Tatsunori OBARA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/09/01
Vol. E97-B  No. 9  pp. 1958-1966
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
analog signal transmissionfrequency-domain equalizationsingle-carrier transmission
 Summary | Full Text:PDF(3MB)

Joint Tx/Rx MMSE Filtering for Single-Carrier MIMO Transmission
Shinya KUMAGAI Tatsunori OBARA Tetsuya YAMAMOTO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/09/01
Vol. E97-B  No. 9  pp. 1967-1976
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
single-carrier transmissionMIMOMMSE filteringrank adaptationadaptive modulation
 Summary | Full Text:PDF(2.5MB)

Signal-Carrier Cooperative DF Relay Using Adaptive Modulation
Kazuhiro KIMURA Hiroyuki MIYAZAKI Tatsunori OBARA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/02/01
Vol. E97-B  No. 2  pp. 387-395
Type of Manuscript:  PAPER
Category: Fundamental Theories for Communications
Keyword: 
cooperative decode-and-forward (DF) relaysingle-carrier transmissionadaptive modulation
 Summary | Full Text:PDF(1.3MB)

Joint Transmit/Receive MMSE-FDE for Analog Network Coded Single-Carrier Bi-directional Multi-Antenna Relay
Hiroyuki MIYAZAKI Tatsunori OBARA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/12/01
Vol. E96-B  No. 12  pp. 3153-3162
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
analog network codingsingle-carrier transmissionjoint transmit/receive frequency-domain equalization
 Summary | Full Text:PDF(2.8MB)

Outage Channel Capacity of Direct/Cooperative AF Relay Switched SC-FDMA Using Spectrum Division/Adaptive Subcarrier Allocation
Masayuki NAKADA Tatsunori OBARA Tetsuya YAMAMOTO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/04/01
Vol. E96-B  No. 4  pp. 1001-1011
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
cooperative AF relaySC-FDMAspectrum division/adaptive subcarrier allocation
 Summary | Full Text:PDF(1.9MB)

Iterative Superimposed Pilot-Assisted Channel Estimation Using Sliding Wiener Filtering for Single-Carrier Block Transmission
Tetsuya UCHIUMI Tatsunori OBARA Kazuki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/03/01
Vol. E95-B  No. 3  pp. 924-932
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
superimposed pilotWiener filterautocorrelation function estimation
 Summary | Full Text:PDF(1.7MB)

Joint MMSE-FDE & Spectrum Combining for a Broadband Single-Carrier Transmission in the Presence of Timing Offset
Tatsunori OBARA Kazuki TAKEDA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/05/01
Vol. E94-B  No. 5  pp. 1366-1375
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
frequency-domain equalizationsingle-carrier transmissionNyquist filtertiming offsetoversampling
 Summary | Full Text:PDF(1.8MB)

Performance Comparison of Overlap FDE and Sliding-Window Chip Equalization for Multi-Code DS-CDMA in a Frequency-Selective Fading Channel
Tatsunori OBARA Kazuki TAKEDA Kyesan LEE Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/03/01
Vol. E94-B  No. 3  pp. 750-757
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
overlap FDEsliding-window chip equalization (SWCE)DS-CDMA
 Summary | Full Text:PDF(1.9MB)

Recent Advances in Single-Carrier Frequency-Domain Equalization and Distributed Antenna Network
Fumiyuki ADACHI Kazuki TAKEDA Tatsunori OBARA Tetsuya YAMAMOTO Hiroki MATSUDA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 2201-2211
Type of Manuscript:  INVITED PAPER (Special Section on Signal Design and its Application in Communications)
Category: 
Keyword: 
single-carrierfrequency-domain equalizationdistributed antenna networkMIMOsignal detection
 Summary | Full Text:PDF(1.5MB)