Zobrazeno 1 - 10
of 16
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
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
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
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
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
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
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
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
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
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