E
Eiji Okamoto
Researcher at Nagoya Institute of Technology
Publications - 123
Citations - 618
Eiji Okamoto is an academic researcher from Nagoya Institute of Technology. The author has contributed to research in topics: Transmission (telecommunications) & MIMO. The author has an hindex of 11, co-authored 123 publications receiving 510 citations. Previous affiliations of Eiji Okamoto include National Institute of Information and Communications Technology.
Papers
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Proceedings ArticleDOI
In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links
Hideki Takenaka,Yoshisada Koyama,Maki Akioka,Dimitar Kolev,Naohiko Iwakiri,Hiroo Kunimori,Alberto Carrasco-Casado,Yasushi Munemasa,Eiji Okamoto,Morio Toyoshima +9 more
TL;DR: The in-orbit verification results of SOTA are presented including the characteristic of the functions, the communication performance with the LDGM code via satellite-to-ground atmospheric paths, and the link budget analysis and the comparison between theoretical and experimental results.
Journal ArticleDOI
A Chaos MIMO Transmission Scheme for Channel Coding and Physical-Layer Security
TL;DR: A chaos multiple-input multiple-output (MIMO) transmission scheme which achieves physical-layer security and additional channelcoding gain and the conventional chaos modulation suffers from bit error rate (BER) performance degradation, while the coding gain is obtained in the proposed scheme by the chaos modulation in MIMO.
Proceedings ArticleDOI
Multimode transmission using wavelet packet modulation and OFDM
TL;DR: This work proposes an adaptive transmission in those interference environments using multimode transmission of WPM and OFDM, and evaluates its performances through computer simulations.
Proceedings ArticleDOI
An Improved Proportional Fair Scheduling in Downlink Non-Orthogonal Multiple Access System
TL;DR: An improved downlink NOMA scheduling scheme is proposed that takes the fairness of the target frame into consideration, and orders the allocation subband based on the instantaneous fairness, and shows an improved performance in the average user throughput and fairness.
Journal ArticleDOI
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 +8 more
TL;DR: This paper focuses on providing a comprehensive survey of research and development activities on fifth generation mobile communication systems in Japan, and tries to survey a vast area of wireless communication systems and the developments that led to future 5G systems.