Akihiro OKAZAKI


A Compact RF Frontend Module of Active Phased Array Antenna for High SHF Wideband Massive MIMO in 5G
Hideyuki NAKAMIZO Shintaro SHINJO Koji TSUTSUMI Satoshi YAMAGUCHI Hideharu YOSHIOKA Akihiro OKAZAKI Akinori TAIRA Kenichi TAJIMA 
Publication:   
Publication Date: 2017/10/01
Vol. E100-C  No. 10  pp. 818-824
Type of Manuscript:  INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
massive MIMOactive phased array antennahigh SHFRF frontend5G
 Summary | Full Text:PDF(1.5MB)

NL-BMD: Nonlinear Block Multi-Diagonalization Precoding for High SHF Wide-Band Massive MIMO in 5G
Hiroshi NISHIMOTO Akinori TAIRA Hiroki IURA Shigeru UCHIDA Akihiro OKAZAKI Atsushi OKAMURA 
Publication:   
Publication Date: 2017/08/01
Vol. E100-B  No. 8  pp. 1215-1227
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Wireless Communication Technologies
Keyword: 
5Gmassive MIMOMU-MIMOinter-user interferenceprecodingnonlinear block multi-diagonalization
 Summary | Full Text:PDF(8.1MB)

Radio Access Technologies for Fifth Generation Mobile Communications System: Review of Recent Research and Developments in Japan
Hidekazu MURATA Eiji OKAMOTO Manabu MIKAMI Akihiro OKAZAKI Satoshi SUYAMA Takamichi INOUE Jun MASHINO Tetsuya YAMAMOTO Makoto TAROMARU 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/08/01
Vol. E99-B  No. 8  pp. 1638-1647
Type of Manuscript:  INVITED PAPER (Special Section on Advanced Information and Communication Technologies and Services in Conjunction with Main Topics of APCC2015)
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
fifth generation mobile communication systemshigher frequency bandmassive MIMOC-Plane/U-Plane splittingC-RAN
 Summary | Full Text:PDF(2.9MB)

Non-coherent MIMO Communication Systems Employing per Transmit Antenna Differential Mapping (PADM)
Hiroshi KUBO Masatsugu HIGASHINAKA Akihiro OKAZAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/10/01
Vol. E95-B  No. 10  pp. 3242-3251
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiple-input multiple-outputtransmit diversityspatial multiplexingdifferential space-time signal processingmaximum-likelihood detectionViterbi detection
 Summary | Full Text:PDF(982.4KB)

Transmission Performance of Space Time Block Coding with Grouped Phase Rotation for Asymmetric MIMO-OFDM System
Akinori NAKAJIMA Kenichiro TANAKA Akinori OHASHI Hiroshi HATTORI Akihiro OKAZAKI Hiroshi KUBO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/12/01
Vol. E94-B  No. 12  pp. 3540-3549
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
asymmetric MIMOOFDMgrouped phase rotationSTBC
 Summary | Full Text:PDF(2.6MB)

Soft Decision Directed Channel Estimation with Interference Cancellation for a MIMO System Using Iterative Equalization and Decoding
Masatsugu HIGASHINAKA Hiroshi KUBO Akihiro OKAZAKI Yasutaka OGAWA Takeo OHGANE Toshihiko NISHIMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/10/01
Vol. E91-A  No. 10  pp. 2787-2797
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication Theory
Keyword: 
MIMOfrequency domain equalizationiterative equalizationchannel estimationinterference cancellation
 Summary | Full Text:PDF(919.9KB)

Likelihood Estimation for Reduced-Complexity ML Detectors in a MIMO Spatial-Multiplexing System
Masatsugu HIGASHINAKA Katsuyuki MOTOYOSHI Akihiro OKAZAKI Takayuki NAGAYASU Hiroshi KUBO Akihiro SHIBUYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/03/01
Vol. E91-B  No. 3  pp. 837-847
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOsphere decodingQRD-M algorithmsoft-decision outputscomputational complexity
 Summary | Full Text:PDF(897.3KB)

Frequency-Domain Equalization Incorporated with Frequency-Domain Redundancy for OFDM Systems
Akihiro OKAZAKI Katsuyuki MOTOYOSHI Masatsugu HIGASHINAKA Takayuki NAGAYASU Hiroshi KUBO Akihiro SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/10/01
Vol. E89-A  No. 10  pp. 2549-2557
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
OFDMFEQISIICI
 Summary | Full Text:PDF(619.5KB)

A Co-channel Interference Cancellation Method Using Low Dimensional Sphere Decoding for MIMO Communication Systems
Masatsugu HIGASHINAKA Akihiro OKAZAKI Katsuyuki MOTOYOSHI Takayuki NAGAYASU Hiroshi KUBO Akihiro SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/10/01
Vol. E89-A  No. 10  pp. 2526-2534
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
MIMOsphere decodingco-channel interferencecomputational complexity
 Summary | Full Text:PDF(954.6KB)

A Multiple-Symbol Differential Detection Based on Channel Prediction for Fast Time-Varying Fading
Hiroshi KUBO Akihiro OKAZAKI Kazuo TANADA Bertrand PENTHER Keishi MURAKAMI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/08/01
Vol. E88-B  No. 8  pp. 3393-3400
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
Viterbi detectionmaximum-likelihood detectiondifferential phase shift keyingfading channels
 Summary | Full Text:PDF(536.5KB)