Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Takenori Ohshima"'
Publikováno v:
2019 49th European Microwave Conference (EuMC).
We propose a configuration of a phased-array receiver with an on-chip built-in self-test (BIST) function. Detection errors caused by asymmetry of the passive circuit are eliminated using a symmetrical layout signal distributor in the BIST path. By co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fa54345706ff6dc0970129a65a33a65
https://doi.org/10.23919/eumc.2019.8910722
https://doi.org/10.23919/eumc.2019.8910722
Autor:
Hikaru Ishikawa, Yoji Ohashi, Toshihiro Shimura, Kenichi Nishikawa, Shohei Ishikawa, Kazuyuki Ozaki, Takenori Ohshima, Masahiko Shimizu, Shunsuke Fujio
Publikováno v:
2018 13th European Microwave Integrated Circuits Conference (EuMIC).
We propose a transmitter configuration with a phase-adjusting function between subarrays for beam multiplexing. We demonstrate a 28-GHz CMOS phased array chip with a phase-adjusting function for a beam-multiplexing transmitter. The phased array chip
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd08bbf9e7ee3e0bfceb6a01b3eb8c9c
https://doi.org/10.23919/eumic.2018.8539933
https://doi.org/10.23919/eumic.2018.8539933
Autor:
Masahiko Shimizu, Yoji Ohashi, Takenori Ohshima, Hiroshi Ashida, Toshihiro Shimura, Kenichi Nishikawa, Chikara Kojima, Shunsuke Fujio, Shohei Ishikawa, Zhengyi Li, Atsushi Honda, Kazuyuki Ozaki
Publikováno v:
PIMRC
In this paper, we propose a novel two-step beam search method for multi-user in millimeter-wave communication and show the experimental evaluation. The numbers of search beams in the first and second steps are theoretically optimized. The evaluation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ee5fa4ffd5de7975e539c46521c1af9
https://doi.org/10.1109/pimrc.2017.8292208
https://doi.org/10.1109/pimrc.2017.8292208
Publikováno v:
2017 47th European Microwave Conference (EuMC).
This paper presents a novel circuit configuration of a vector-sum phase shifter for millimeter-wave beamforming to lower power consumption. The proposed configuration has a 90-degree hybrid circuit and two zero-pi amplifiers. The zero-pi amplifiers h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::552f6a66cbe3100973dbcda3fb34843a
https://doi.org/10.23919/eumc.2017.8230794
https://doi.org/10.23919/eumc.2017.8230794
Autor:
Takenori Ohshima, Zhengyi Li, Kazuyuki Ozaki, Atsushi Honda, Hiroshi Ashida, Chikara Kojima, Masahiko Shimizu, Kenichi Nishikawa, Shohei Ishikawa, Toshihiro Shimura, Yoji Ohashi, Shunsuke Fujio
Publikováno v:
PIMRC
The research on millimeter-wave communication is very hot all over the world because of the large bandwidth and beamforming. However, the high power consumption due to the large number of high speed DACs/ADCs is the obstacle of utilizing full digital
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef9480db222eda9e8d51e51a6495ed5b
https://doi.org/10.1109/pimrc.2017.8292487
https://doi.org/10.1109/pimrc.2017.8292487
System validation of millimeter-wave beam multiplexing with interleaved hybrid beam-forming antennas
Autor:
Atsushi Honda, Kazuyuki Ozaki, Chikara Kojima, Zhengyi Li, Toshihiro Shimura, Takenori Ohshima, Masahiko Shimizu, Kenichi Nishikawa, Hiroshi Ashida, Shohei Ishikawa, Shunsuke Fujio, Yoji Ohashi
Publikováno v:
PIMRC
This paper describes beam division multiplexing at millimeter wave band using interleaved hybrid beam-forming (BF) antennas. The antenna elements are located alternately to make narrow beam-width of about 5 degrees, and the user multiplexing calculat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f8333f1a6913933f0cfcff1389251e6
https://doi.org/10.1109/pimrc.2016.7794711
https://doi.org/10.1109/pimrc.2016.7794711
Autor:
Toshihiro Shimura, Shunsuke Fujio, Hiroshi Ashida, Atsushi Honda, Kenichi Nishikawa, Chikara Kojima, Zhengyi Li, Yoji Ohashi, Takenori Ohshima, Masahiko Shimizu, Shohei Ishikawa, Kazuyuki Ozaki
Publikováno v:
PIMRC
This paper considers millimeter-wave access network systems with space division multiple access using an interleaved subarray hybrid beamforming structure, where antenna elements in each subarray scatter uniformly over the whole antenna array. The st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c9c00165eb44fbc166eb711723b31f4
https://doi.org/10.1109/pimrc.2016.7794677
https://doi.org/10.1109/pimrc.2016.7794677
Autor:
Shunsuke Fujio, Shohei Ishikawa, Toshihiro Shimura, Masahiko Shimizu, Kazuyuki Ozaki, Atsushi Honda, Hiroshi Ashida, Takenori Ohshima, Li Zhengyi, Chikara Kojima, Kenichi Nishikawa, Makoto Yoshida, Yoji Ohashi
Publikováno v:
PIMRC
A millimeter-wave beam multiplexing method using a hybrid beamforming is proposed. We theoretically show that inter-subarray coding at the subarray type interleaved configuration can reduce interference and multiple beams of the same high gain as the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e04e70c6d99472c4825074029a3b3542
https://doi.org/10.1109/pimrc.2016.7794691
https://doi.org/10.1109/pimrc.2016.7794691
Publikováno v:
2015 IEEE MTT-S International Microwave Symposium.
Methods for detecting phase and power difference by using a mixer configured with two symmetrically connected unit mixers with delay lines are proposed. The mixer having two detection curves achieves highly accurate phase detection for all phases, co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::965bc2e88facb3b9a2b063af7e8e71a0
https://doi.org/10.1109/mwsym.2015.7166889
https://doi.org/10.1109/mwsym.2015.7166889
Autor:
Ryosaku Inamura, Takuya Uzumaki, Sanae Takefusa, Takenori Ohshima, Toshio Sugimoto, Kazumasa Shimoda, Daiju Kaneko, Atsushi Tanaka
Publikováno v:
Journal of Magnetism and Magnetic Materials. 287:176-180
The recording characteristics dependence on the intermediate layer (IL) thickness is investigated for CoPtCr–SiO 2 double-layered perpendicular media, which contain antiferromagnetically coupled layers (AFM) formed below soft-magnetic underlayer (S
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39fbe4c992cf6e070e7ca139992efe2f
https://doi.org/10.1016/j.jmmm.2004.10.029
https://doi.org/10.1016/j.jmmm.2004.10.029