Autonomous grouping scheme for selfish DSC introduced spectrum sharing in asynchronous transmit timing conditions. - Tatsuki Okuyama; Shinsuke Ibi; Seiichi Sampei (PIMRC, 2012)

Delay properties in non-orthogonal spectrum sharing with adaptively rate controlled selfish dynamic spectrum control. - Tatsuki Okuyama; Shinsuke Ibi; Seiichi Sampei (ICSPCS, 2013)

Indoor and outdoor experimental trials in 28-GHz band for 5G wireless communication systems. - Tatsunori Obara; Tatsuki Okuyama; Yuuichi Aoki; Satoshi Suyama; Jaekon Lee; Yukihiko Okumura (PIMRC, 2015)

Antenna deployment for 5G ultra high-density distributed antenna system at low SHF bands. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Yukihiko Okumura (CSCN, 2016)

Flexible antenna deployment for 5G distributed Massive MIMO in low SHF bands. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Yukihiko Okumura (ICSPCS, 2016)

User Selection and Rank Adaptation for Multi-User Massive MIMO with Hybrid Beamforming. - Hiroyuki Miyazaki; Satoshi Suyama; Tatsuki Okuyama; Jun Mashino; Yukihiko Okumura (VTC Fall, 2017)

Antenna Deployment of 5G Ultra High-Density Distributed Massive MIMO by Low-SHF-Band Indoor and Outdoor Experiments. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Yukihiko Okumura; Kotaro Shiizaki; Chiyoshi Akiyama; Masafumi Tsutsui; Hiroyuki Seki; Morihiko Minowa (VTC Fall, 2017)

Field Experiment of High-Capacity Technologies for 5G Ultra High-Density Distributed Antenna Systems. - Hiroyuki Seki; Masafumi Tsutsui; Morihiko Minowa; Kotaro Shiizaki; Chiyoshi Akiyama; Tatsuki Okuyama; Jun Mashino; Satoshi Suyama; Yukihiko Okumura (VTC Spring, 2017)

DL MU-MIMO Field Trial with 5G Low SHF Band Massive MIMO Antenna. - Kenichiro Yamazaki; Toshifumi Sato; Yasushi Maruta; Tatsuki Okuyama; Jun Mashino; Satoshi Suyama; Yukihiko Okumura (VTC Spring, 2017)

5G massive MIMO with digital beamforming and two-stage channel estimation for low SHF band. - Shohei Yoshioka; Satoshi Suyama; Tatsuki Okuyama; Jun Mashino; Yukihiko Okumura (Wireless Days, 2017)

Experimental evaluation of digital beamforming for 5G multi-site massive MIMO. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Shohei Yoshioka; Yukihiko Okumura; Kenichiro Yamazaki; Daisuke Nose; Yasushi Maruta (WPMC, 2017)

Digital beamforming algorithm for 5G low-SHF-band massive MIMO with intersite coordination. - Shohei Yoshioka; Satoshi Suyama; Tatsuki Okuyama; Jun Mashino; Yukihiko Okumura (WPMC, 2017)

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 (IEICE Trans. Commun., 2017)

5G Distributed Massive MIMO with Ultra-High Density Antenna Deployment in Low SHF Bands. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Yukihiko Okumura (IEICE Trans. Commun., 2017)

5G Experimental Trials of 4.5 GHz Band Digital Beamforming in Dense Urban Area. - Tatsuki Okuyama; Satoshi Suyama; Jun Mashino; Yukihiko Okumura; Kohei Izui; Kenichiro Yamazaki (PIMRC, 2018)

Outdoor DL MU-MIMO and Inter Access Point Coordination Performance of Low-SHF-Band C-RAN Massive MIMO System for 5G. - Yasushi Maruta; Kenichiro Yamazaki; Kohei Izui; Tatsuki Okuyama; Jun Mashino; Satoshi Suyama; Kanada Nakayasu; Toshifumi Sato; Yukihiko Okumura (VTC Spring, 2018)

Field Experimental DL MU-MIMO Evaluations of Low-SHF-Band C-RAN Massive MIMO System with over 100 Antenna Elements for 5G. - Kenichiro Yamazaki; Kohei Izui; Kanada Nakayasu; Tatsuki Okuyama; Jun Mashino; Satoshi Suyama; Toshifumi Sato; Yukihiko Okumura (VTC Fall, 2018)

Experimental Trials of 5G Ultra High-Density Distributed Antenna Systems. - Shinya Kumagai; Morihiko Minowa; Tatsuki Okuyama; Jun Mashino; Satoshi Suyama; Yukihiko Okumura; Takaharu Kobayashi; Teppei Oyama; Chiyoshi Akiyama; Masafumi Tsutsui; Daisuke Jitsukawa; Takashi Seyama; et al. (VTC Fall, 2019)

Uplink Multi-User Massive MIMO Using Gaussian BP in Highly Correlated Actual Environments. - Tatsuki Okuyama; Kazushi Muraoka; Shinsuke Ibi; Takumi Takahashi; Satoshi Suyama; Jun Mashino; Seiichi Sampei; Yukihiko Okumura (VTC Fall, 2019)

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 (IEICE Trans. Commun., 2019)

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 (IEICE Trans. Commun., 2019)

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 (IEICE Trans. Commun., 2019)

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 (IEICE Trans. Commun., 2019)

Digital Beamforming Algorithm for 5G Low-SHF Band Massive MIMO. - Shohei Yoshioka; Satoshi Suyama; Tatsuki Okuyama; Jun Mashino; Yukihiko Okumura (IEICE Trans. Commun., 2019)

28 GHz-Band Experimental Trial at 283 km/h Using the Shinkansen for 5G Evolution. - Nobuhide Nonaka; Kazushi Muraoka; Tatsuki Okuyama; Satoshi Suyama; Yukihiko Okumura; Takahiro Asai; Yoshihiro Matsumura (VTC Spring, 2020)

Two Millimeter-Wave Base Station Cooperation Technologies in High-Mobility Environments for 5G Evolution. - Tatsuki Okuyama; Satoshi Suyama; Nobuhide Nonaka; Yukihiko Okumura; Takahiro Asai (VTC Spring, 2020)

Outdoor Experimental Trials of Millimeter-Wave Base Station Cooperation with Digital Beamforming in High-Mobility Environments for 5G Evolution. - Tatsuki Okuyama; Satoshi Suyama; Nobuhide Nonaka; Yukihiko Okumura; Takahiro Asai (VTC Fall, 2020)

Millimeter-Wave Base Station Cooperation Technologies for High-Mobility Environments. - Tatsuki Okuyama; Satoshi Suyama; Nobuhide Nonaka; Takahiro Asai (APWCS, 2021)

Outdoor Experimental Trials of 28 GHz Band Base Station Cooperation in High-Mobility Environment of Multiple Mobile Stations. - Tatsuki Okuyama; Satoshi Suyama; Nobuhide Nonaka; Takahiro Asai (VTC Fall, 2021)

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 (IEICE Trans. Commun., 2021)

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 (IEICE Trans. Commun., 2021)

Base Station Cooperation Technologies Using 28GHz-Band Digital Beamforming in High-Mobility Environments. - Tatsuki Okuyama; Nobuhide Nonaka; Satoshi Suyama; Yukihiko Okumura; Takahiro Asai (IEICE Trans. Commun., 2021)

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 (IEICE Trans. Commun., 2021)

Recent Studies on Massive MIMO Technologies for 5G Evolution and 6G. - Satoshi Suyama; Tatsuki Okuyama; Nobuhide Nonaka; Takahiro Asai (RWS, 2022)

Experimental Trial aboard Shinkansen Test Train Running at 360 km/h for 5G Evolution. - Nobuhide Nonaka; Satoshi Suyama; Tatsuki Okuyama; Yuto Hama; Daisuke Kitayama; Takahiro Asai; Shoji Itoh; Anders Carlsson; Johan Furuskog; Magnus Wikström; Qiang Zhang; Kenichiro Kamohara; et al. (VTC Spring, 2022)

Outdoor Experimental Trials on Deployments of Multiple Base Station Antennas for 28 GHz-Band Cooperated Digital Beamforming. - Tatsuki Okuyama; Satoshi Suyama; Nobuhide Nonaka; Takahiro Asai (VTC Spring, 2022)

Evaluation of Indoor Area Improvement in the High Frequency Band Using Metasurface Lenses, FSS Technology and Relay Stations. - Jun Tsuboi; Takeshi Motegi; Osamu Kagaya; Daisuke Kitayama; Kensuke Miyachi; Tatsuki Okuyama; Satoshi Suyama; Takahiro Asai (VTC Spring, 2022)