Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Keishi Murakami"'
Autor:
Shun Ishikawa, Keishi Murakami
Publikováno v:
Japan Journal of Human Growth and Development Research. 2022:45-54
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6737b968287e2fe65ae4a26605dcd077
https://doi.org/10.5332/hatsuhatsu.2022.93_45
https://doi.org/10.5332/hatsuhatsu.2022.93_45
Autor:
Keishi Murakami, Shinichi Nakasuka, Makoto Mita, Takahisa Tomoda, Noriyuki Kawano, Akira Hirose, Yuhei Nagao, Hirobumi Saito, Kei-ichi Hirako, Hiromi Watanabe, Seiko Shirasaka, Tomoki Kaneko
Publikováno v:
IEICE Transactions on Communications. :1-12
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41c8eb502ca2be813912861c0958ad69
https://doi.org/10.1587/transcom.2019ebn0009
https://doi.org/10.1587/transcom.2019ebn0009
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 89:36-45
This paper presents the results of a study of the OFDM adaptive modulation technique. The adaptive modulation technique, which selects the modulation scheme according to the transmission conditions, is effective in improving system throughput. Then,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe9192f72edc995cc27bc203de4429e0
https://doi.org/10.1002/ecja.20254
https://doi.org/10.1002/ecja.20254
Autor:
Koji Tsutsumi, Keishi Murakami, Noriharu Suematsu, Hiroshi Kubo, Yoji Isota, Gakushi Kanazawa, Tomotsugu Sekine
Publikováno v:
IEEJ Transactions on Electronics, Information and Systems. 126:1093-1100
For the next generation wireless terminals used in the software defined radio (SDR), multi-band / multi-mode transceivers and their MMIC are required which cover the wide RF frequency range from several hundreds MHz up to several GHz. In this paper,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eff904f833cf5f3a50dc988ea243c0e5
https://doi.org/10.1541/ieejeiss.126.1093
https://doi.org/10.1541/ieejeiss.126.1093
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 89:44-54
In this paper, based on an adaptive algorithm, an adaptive peak power reduction scheme (APPR) is proposed that can reduce the peak power and suppress radiated power outside the bandwidth. In the proposed method, no sudden nonlinear processing such as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0adfebe5a5440774d2cf4090719b96b
https://doi.org/10.1002/ecja.20244
https://doi.org/10.1002/ecja.20244
Publikováno v:
IEICE Transactions on Communications. :3393-3400
This paper discusses a generalized concept of multiple-symbol differential detection (MDD) and analytically derives weight parameters based on channel prediction for MDD on fast time-varying channels. At first, this paper shows that adaptive maximum-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c2dbaf10b1ea2152594ad15236d434f
https://doi.org/10.1093/ietcom/e88-b.8.3393
https://doi.org/10.1093/ietcom/e88-b.8.3393
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 89:10-21
This paper considers a multicarrier system performing burst transmission and discusses the channel estimation method, together with the estimation accuracy. In a multicarrier system such as OFDM, the channel state information of each subcarrier is es
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::260770e8d7450e75f0d3b1261c60ec12
https://doi.org/10.1002/ecja.20261
https://doi.org/10.1002/ecja.20261
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 87:12-21
In this paper, we discuss techniques for transmitting signals over the same frequency by synchronizing multiple base stations in order to achieve both high communication quality and excellent spectral efficiency in broadcast (P-MP: Point to Multipoin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a7de1ae44a75f13281292edfa2cc4cb
https://doi.org/10.1002/ecja.10167
https://doi.org/10.1002/ecja.10167
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 83:76-85
As a receiving method suitable for channels with intersymbol interference such as frequency selective fading, a method is proposed in which the soft decision using the hard decision sequence generated from the data after forward error correction (FEC
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d05ded03efce2f76a4e6964bedca65b
https://doi.org/10.1002/(sici)1520-6424(200009)83:9<76::aid-ecja8>3.0.co
https://doi.org/10.1002/(sici)1520-6424(200009)83:9<76::aid-ecja8>3.0.co
Publikováno v:
Electronics and Communications in Japan (Part I: Communications). 81:31-39
In this paper, an adaptive soft-output Viterbi equalizer (SOVE) is proposed for fast time-varying frequency-selective fading. The demodulator can make a symbol-by-symbol or bit-by-bit soft-decision based on a posteriori probabilities. The proposed ad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1fabe645f2f0df821281815290474d5
https://doi.org/10.1002/(sici)1520-6424(199804)81:4<31::aid-ecja4>3.0.co
https://doi.org/10.1002/(sici)1520-6424(199804)81:4<31::aid-ecja4>3.0.co