Tatsuki OKUYAMA


A Study on Extreme Wideband 6G Radio Access Technologies for Achieving 100Gbps Data Rate in Higher Frequency Bands
Satoshi SUYAMA Tatsuki OKUYAMA Yoshihisa KISHIYAMA Satoshi NAGATA Takahiro ASAI 
Publication:   
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 992-999
Type of Manuscript:  INVITED PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
sixth generation mobile communication systemradio access technologymillimeter waveterahertz waveextreme high data rate
 Summary | Full Text:PDF(2.4MB)

28 GHz-Band Experimental Trial Using the Shinkansen in Ultra High-Mobility Environment for 5G Evolution
Nobuhide NONAKA Kazushi MURAOKA Tatsuki OKUYAMA Satoshi SUYAMA Yukihiko OKUMURA Takahiro ASAI Yoshihiro MATSUMURA 
Publication:   
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 1000-1008
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
5G evolutionmassive MIMOultra high-mobilityhigh speed train28GHz band
 Summary | Full Text:PDF(4.5MB)

Base Station Cooperation Technologies Using 28GHz-Band Digital Beamforming in High-Mobility Environments
Tatsuki OKUYAMA Nobuhide NONAKA Satoshi SUYAMA Yukihiko OKUMURA Takahiro ASAI 
Publication:   
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 1009-1016
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
5G evolutionmillimeter-wavehigh-mobility environmentdigital BFBS cooperation technology
 Summary | Full Text:PDF(3.1MB)

Two-Step User Selection Algorithm in Multi-User Massive MIMO with Hybrid Beamforming for 5G Evolution
Nobuhide NONAKA Satoshi SUYAMA Tatsuki OKUYAMA Kazushi MURAOKA Yukihiko OKUMURA 
Publication:   
Publication Date: 2021/09/01
Vol. E104-B  No. 9  pp. 1089-1096
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond)
Category: 
Keyword: 
5Gmassive-MIMOmulti-user MIMOhybrid beamforminglow-complexity
 Summary | Full Text:PDF(1.3MB)

Field Trial of 28GHz Band 5G Downlink Massive MIMO Employing Beam Tracking in Railway Environment
Yuta TAKAHASHI Tatsuki OKUYAMA Kazushi MURAOKA Satoshi SUYAMA Jun MASHINO Yukihiko OKUMURA 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1411-1417
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category: 
Keyword: 
5Ghigh mobilitymassive MIMObeamformingbeam tracking
 Summary | Full Text:PDF(6MB)

Digital Beamforming Algorithm for 5G Low-SHF Band Massive MIMO
Shohei YOSHIOKA Satoshi SUYAMA Tatsuki OKUYAMA Jun MASHINO Yukihiko OKUMURA 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1371-1381
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category: 
Keyword: 
5Glow-SHF bandmassive MIMOmulti-user MIMOfully-digital beamformingintersite coordination
 Summary | Full Text:PDF(3.7MB)

Performance Evaluation of Low Complexity Digital Beamforming Algorithms by Link-Level Simulations and Outdoor Experimental Trials for 5G Low-SHF-Band Massive MIMO
Tatsuki OKUYAMA Satoshi SUYAMA Jun MASHINO Kazushi MURAOKA Kohei IZUI Kenichiro YAMAZAKI Yukihiko OKUMURA 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1382-1389
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category: 
Keyword: 
5GMassive MIMOdigital beamformingoutdoor experimental trialslow SHF bands
 Summary | Full Text:PDF(3.4MB)

Experimental Study of Large-Scale Coordinated Multi-User MIMO for 5G Ultra High-Density Distributed Antenna Systems
Takaharu KOBAYASHI Masafumi TSUTSUI Takashi DATEKI Hiroyuki SEKI Morihiko MINOWA Chiyoshi AKIYAMA Tatsuki OKUYAMA Jun MASHINO Satoshi SUYAMA Yukihiko OKUMURA 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1390-1400
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category: 
Keyword: 
5Gcell densificationdistributed antenna systemcoordinated multi-user MIMOfield experiment
 Summary | Full Text:PDF(3.5MB)

Performance Evaluation of Downlink Multi-User Massive MIMO with Configurable Active Antenna System and Inter Access Point Coordination in Low-SHF-Band
Yi JIANG Kenichiro YAMAZAKI Toshihiro HAYATA Kohei IZUI Kanada NAKAYASU Toshifumi SATO Tatsuki OKUYAMA Jun MASHINO Satoshi SUYAMA Yukihiko OKUMURA 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1401-1410
Type of Manuscript:  Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category: 
Keyword: 
5GMassive MIMOlow-SHF-bandMU-MIMObeamformingC-RANCBCoMP
 Summary | Full Text:PDF(5.3MB)

5G Distributed Massive MIMO with Ultra-High Density Antenna Deployment in Low SHF Bands
Tatsuki OKUYAMA Satoshi SUYAMA Jun MASHINO Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/10/01
Vol. E100-B  No. 10  pp. 1921-1927
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
5Gultra-high densitydistributed massive MIMOvirtual cellflexible antenna deploymentlow SHF bands
 Summary | Full Text:PDF(2.1MB)

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)