Akihiro OKAZAKI


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
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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)