Distributed file management techniques based on an autonomous decentralized system concept. - Masayuki Orimo; Sigeki Hirasawa; Akihiro Okazaki; Hirosi Fujise; Masuyuki Takeuchi; Kinji Mori (Comput. Commun., 1993)

A parallel blind demodulator in the presence of intersymbol interference. - Hiroshi Kubo; Akihiro Okazaki; Kazuo Tanada; Bertrand Penther; Makoto Miyake (ICC, 2001)

Experimental evaluation of a parallel blind demodulator combined with a Reed-Solomon decoder in the presence of intersymbol interference. - Kazuo Tanada; Hiroshi Kubo; Akihiro Okazaki; Takeshi Uraguchi; Shuichi Hayashi; Hisashi Ishikawa; Atsushi Iwase; Jun Taniguchi (VTC Fall, 2001)

Performance Improvement for MIMO Communication Systems Employing Per Transmit Antenna Differential Encoding (PADE). - Hiroshi Kubo; Masatsugu Higashinaka; Akihiro Okazaki; Keishi Murakami (PIMRC, 2005)

A Multiple-Symbol Differential Detection Based on Channel Prediction for Fast Time-Varying Fading. - Hiroshi Kubo; Akihiro Okazaki; Kazuo Tanada; Bertrand Penther; Keishi Murakami (IEICE Trans. Commun., 2005)

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 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Frequency-Domain Equalization Incorporated with Frequency-Domain Redundancy for OFDM Systems. - Akihiro Okazaki; Katsuyuki Motoyoshi; Masatsugu Higashinaka; Takayuki Nagayasu; Hiroshi Kubo; Akihiro Shibuya (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Capacity Evaluation of MIMO-OFDM Systems using Reduced-Complexity ML Detectors in a Spatially Correlated Channel. - Masatsugu Higashinaka; Katsuyuki Motoyoshi; Takayuki Nagayasu; Hiroshi Kubo; Akihiro Shibuya; Akihiro Okazaki (PIMRC, 2007)

Likelihood Estimation for Reduced-Complexity ML Detectors in a MIMO System. - Masatsugu Higashinaka; Katsuyuki Motoyoshi; Takayuki Nagayasu; Hiroshi Kubo; Akihiro Shibuya; Akihiro Okazaki (VTC Spring, 2007)

Channel Quality Indicator Estimation for OFDMA Systems in the Downlink. - Abdel-Majid Mourad; Loïc Brunel; Akihiro Okazaki; Umer Salim (VTC Spring, 2007)

Channel estimation with interference cancellation for a MIMO receiver using iterative equalization and decoding. - Masatsugu Higashinaka; Hiroshi Kubo; Akihiro Okazaki (PIMRC, 2008)

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 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

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 (IEICE Trans. Commun., 2008)

Low complexity frame synchronization methods for fading channels. - Fumihiro Hasegawa; Hiroyasu Sano; Akihiro Okazaki; Hiroshi Kubo (PIMRC, 2010)

Super-Resolution Blind Channel Modeling. - Man-On Pun; Andreas F. Molisch; Philip V. Orlik; Akihiro Okazaki (ICC, 2011)

Peak power reduction techniques for multi-channel SC-OFDM. - Fumihiro Hasegawa; Akihiro Okazaki; Hiroshi Kubo (PIMRC, 2011)

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 (IEICE Trans. Commun., 2011)

Channel estimation technique for OFDM systems spread by chirp sequences. - Keisuke Ozaki; Koji Tomitsuka; Akihiro Okazaki; Hiroyasu Sano; Hiroshi Kubo (PIMRC, 2012)

A Novel PAPR Reduction Scheme for SC-OFDM with Frequency Domain Multiplexed Pilots. - Fumihiro Hasegawa; Akihiro Okazaki; Hiroshi Kubo; Damien Castelain; David Mottier (IEEE Commun. Lett., 2012)

Non-coherent MIMO Communication Systems Employing per Transmit Antenna Differential Mapping (PADM). - Hiroshi Kubo; Masatsugu Higashinaka; Akihiro Okazaki (IEICE Trans. Commun., 2012)

Phase-Anchored SC-OFDM. - Fumihiro Hasegawa; Masatsugu Higashinaka; Akihiro Okazaki; Fumio Ishizu; Damien Castelain; Loïc Brunel; David Mottier (IEEE Wirel. Commun. Lett., 2014)

R&D activities for 5G in IEICE technical committee on radio communication systems. - Hidekazu Murata; Eiji Okamoto; Manabu Mikami; Akihiro Okazaki; Satoshi Suyama; Takamichi Inoue; Jun Mashino; Tetsuya Yamamoto; Makoto Taromaru (APCC, 2015)

Performance Evaluation of 44GHz Band Massive MIMO Based on Channel Measurement. - Akinori Taira; Hiroki Iura; Kenji Nakagawa; Shigeru Uchida; Kazuaki Ishioka; Akihiro Okazaki; Satoshi Suyama; Tatsunori Obara; Yukihiko Okumura; Atsushi Okamura (GLOBECOM Workshops, 2015)

Static sequence assisted out-of-band power suppression for DFT-s-OFDM. - Fumihiro Hasegawa; Shintaro Shinjo; Akihiro Okazaki; Atsushi Okamura; Loïc Brunel; David Mottier (PIMRC, 2015)

Cell Structure for High-Speed Land-Mobile Communications. - Shusaku Umeda; Akihiro Okazaki; Hiroshi Nishimoto; Kaoru Tsukamoto; Kanako Yamaguchi; Atsushi Okamura (VTC Fall, 2015)

Novel Dynamic and Static Methods for Out-of-Band Power Suppression in SC-OFDM. - Fumihiro Hasegawa; Akihiro Okazaki; Atsushi Okamura; Damien Castelain; Cristina Ciochina-Duchesne; Loïc Brunel; David Mottier (IEEE Wirel. Commun. Lett., 2015)

Two-dimensional diversity with serial concatenation of spectral precoding and DSTBC. - Kanako Yamaguchi; Nicolas Gresset; Hiroshi Nishimoto; Akihiro Okazaki; Shusaku Umeda; Kaoru Tsukamoto; Hiroyasu Sano; Atsushi Okamura (ISITA, 2016)

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 (PIMRC, 2016)

Block lower multi-diagonalization for multiuser MIMO downlink. - Hiroshi Nishimoto; Hiroki Iura; Akinori Taira; Akihiro Okazaki; Atsushi Okamura (WCNC, 2016)

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 (IEICE Trans. Commun., 2016)

3GPP standardization activities in relay based 5G high speed train scenarios for the SHF band. - Fumihiro Hasegawa; Akinori Taira; Hiroshi Nishimoto; Akihiro Okazaki; Atsushi Okamura; Gosan Noh; Bing Hui; Junhwan Lee; Ilgyu Kim (CSCN, 2017)

Static sequence wrapped DFT-s-OFDM for high-speed train scenarios in high-SHF bands. - Fumihiro Hasegawa; Hiroshi Nishimoto; Akihiro Okazaki; Atsushi Okamura (EuCNC, 2017)

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 (IEICE Trans. Electron., 2017)

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 (IEICE Trans. Commun., 2017)

Performance Evaluation of NL-BMD Precoding over Analog-Digital Hybrid Beamforming for High SHF Wide-Band Massive MIMO in 5G. - Hiroshi Nishimoto; Akinori Taira; Hiroki Iura; Shigeru Uchida; Akihiro Okazaki; Atsushi Okamura (Int. J. Wirel. Inf. Networks, 2017)

Non-Linear Precoding for 5G NR. - Fumihiro Hasegawa; Hiroshi Nishimoto; Nuan Song; Mihail Enescu; Akinori Taira; Akihiro Okazaki; Atsushi Okamura (CSCN, 2018)

Indoor Experimental Trial on Hybrid 16-Beam Spatial-Multiplexing for High SHF Wide-Band Massive MIMO in 5G. - Manabu Sakai; Kenji Nakagawa; Hiroki Iura; Naofumi Iwayama; Akihiro Okazaki; Nobuhide Nonaka; Satoshi Suyama; Jun Mashino; Atsushi Okamura; Yukihiko Okumura (VTC Fall, 2018)

High-Speed Train Communications Standardization in 3GPP 5G NR. - Fumihiro Hasegawa; Akinori Taira; Gosan Noh; Bing Hui; Hiroshi Nishimoto; Akihiro Okazaki; Atsushi Okamura; Junhwan Lee; Ilgyu Kim (IEEE Commun. Stand. Mag., 2018)

5G R&D Achievements for High-Data-Rate and Low-Power-Consumption Radio Access Technologies with Higher-Frequency-Band and Wider-Bandwidth Massive MIMO. - Yukihiko Okumura; Satoshi Suyama; Naoto Ishii; Yasushi Maruta; Akihiro Okazaki; Atsushi Okamura; Jun Terada; Takeshi Onizawa (VTC Spring, 2019)

An Equalization of PN-DSTBC for Concatenating with Spectral Precoding. - Kanako Yamaguchi; Nicolas Gresset; Hiroshi Nishimoto; Akihiro Okazaki; Hiroyasu Sano; Shusaku Umeda; Kaoru Tsukamoto; Atsushi Okamura (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Experimental Field Trials on MU-MIMO Transmissions for High SHF Wide-Band Massive MIMO in 5G. - Manabu Sakai; Kenichiro Kamohara; Hiroki Iura; Hiroshi Nishimoto; Kazuaki Ishioka; Yoshitaka Murata; Masayuki Yamamoto; Akihiro Okazaki; Nobuhide Nonaka; Satoshi Suyama; Jun Mashino; Atsushi Okamura; et al. (IEEE Trans. Wirel. Commun., 2020)

Experimental Trials on Sidelink Multi-hop Communications. - Manabu Sakai; Kazuma Obigane; Hiroshi Nishimoto; Akihiro Okazaki; Masaki Noda (VTC2023-Spring, 2023)

Heartbeat Interval Estimation Method Using Sub-Terahertz Sensing. - Shusaku Umeda; Kazuaki Ishioka; Kota Nakamura; Michiya Hayama; Akinori Taira; Akihiro Okazaki (CCNC, 2024)