2025
conference-abstract
OpenAlex
Kazuyuki Enomoto, Yuto Nagao, Takuya Yabe, Michiko Tsuda et autres
This work describes a chemical approach to identify the source of luminescence emitted during the irradiation of water at 245 keV electrons, below the Cherenkov threshold. The method involves nitrate scavenging and luminescence energy transfer processes. Scavenging techniques are used to reveal …
jp
(code pays fourni par la source)
2023
conference-paper
OpenAlex
Manabu Sakai, Kazuma Obigane, Hiroshi Nishimoto, Akihiro Okazaki et autres
Cellular vehicle-to-everything (C-V2X) is an emerging technology to realize autonomous driving and Mobility as a Service (MaaS). In C-V2X communications, direct device-to-device communication without passing through the mobile core network, called Sidelink, is employed in vehicle-to-vehicle or vehicle-to-infrastructure communication scenarios. To extend …
jp
(code pays fourni par la source)
2021
article
OpenAlex
Manabu Sakai, Hiroki Iura, Kenji Nakagawa, Hiroshi Nishimoto et autres
2020
article
OpenAlex
Manabu Sakai, Kenichiro Kamohara, Hiroki Iura, Hiroshi Nishimoto et autres
The field trial results for massive multi-user multiple-input multiple-output (MU-MIMO) transmission at 28 GHz with 500 MHz bandwidth are reported in this paper. In this experiment, hybrid beamforming with block diagonal precoding is employed, in which channel state information is acquired by …
jp
(code pays fourni par la source)
2019
conference-paper
OpenAlex
Nobuhide Nonaka, Kazushi Muraoka, Satoshi Suyama, Jun Mashino et autres
The fifth-generation (5G) mobile communication system introduces the use of high frequency bands with very wide bandwidth for realizing super high bit rate more than 20 Gbps. To use such high frequency bands, Massive MIMO technologies by hybrid beamforming is a promising …
jp
(code pays fourni par la source)
2019
conference-paper
OpenAlex
Tasuku Kuriyama, Naofumi Yoneda, Satoshi Yamaguchi, Hikaru Watanabe et autres
In the 5th generation mobile communication system, large system capacity, low latency and massive connection will be provided for novel and various applications. In order to realize these features, we are developing high SHF band massive MIMO system which can secure wide …
jp
(code pays fourni par la source)
2019
conference-paper
OpenAlex
Junichi Nakagawa, Shintaro Shinjo, Keigo Nakatani, Hideyuki Nakamizo et autres
In 5G mobile communication systems, superb performances, namely large system capacity, low latency and massive connection are expected. A massive multiple input multiple output (MIMO)antenna has attracted a great attraction to become a key technology to meet such 5G requirements. In this …
jp
(code pays fourni par la source)
2019
article
OpenAlex
Manabu Sakai, Kenji Nakagawa, Kamohara Kenichiro, Hiroki Iura et autres
2018
article
OpenAlex
Hiroki Iura, Manabu Sakai, Nobuhide Nonaka, Naofumi Iwayama et autres
2018
conference-paper
OpenAlex
Manabu Sakai, Kenji Nakagawa, Hiroki Iura, Naofumi Iwayama et autres
Recently, the fifth-generation mobile communications system (5G) in higher frequency bands has been extensively studied. Massive MIMO is one of the promising technologies to dramatically increase spectral efficiency. The authors have been engaged on R&D into wideband massive MIMO and beam control …
jp
(code pays fourni par la source)
2018
article
OpenAlex
Hiroshi Nishimoto, Manabu Sakai, Kenji Nakagawa, Shigeru Uchida et autres
2017
conference-paper
OpenAlex
Kengo Ikeuchi, Manabu Sakai, Hai Feng Lin
We propose a time-domain phase noise (PN) compensation scheme for orthogonal frequency division multiplexing with offset quadrature amplitude modulation (OFDM/OQAM) systems. The proposed scheme fully explores the unique overlapped signal structure of OFDM/OQAM to perform symbol-wise phase noise approximation using discrete cosine …
jp
(code pays fourni par la source)