Tatsunori OBARA


Experimental Trial of 5G Super Wideband Wireless Systems Using Massive MIMO Beamforming and Beam Tracking Control in 28GHz Band
Tatsunori OBARA Tatsuki OKUYAMA Yuki INOUE Yuuichi AOKI Satoshi SUYAMA Jaekon LEE Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/08/01
Vol. E100-B  No. 8  pp. 1256-1268
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Wireless Communication Technologies
Keyword: 
5Ghigher frequency bandsmassive MIMObeamformingspatial multiplexingbeam tracking
 Summary | Full Text:PDF(10.2MB)

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)