公开(公告)号：US20240267091A1

公开(公告)日：2024-08-08

申请号：US18567711

申请日：2022-06-08

Applicant: Tokyo Institute of Technology

Inventor： Kenichi Okada

IPC: H04B7/0413

CPC classification number: H04B7/0413

Abstract: A wireless communication device includes an antenna section configured to be provided with a plurality of antenna units that transmit and receive n communication signals having different directivities, a multiplexer configured to be connected to the antenna section, and n signal transmitting and receiving units configured to be connected to the multiplexer, to generate transmission signals, to demodulate reception signals, and to be provided corresponding to the n communication signals. The multiplexer switches connections between the antenna section and the n signal transmitting and receiving units in a time-division manner in a sampling period shorter than a period of a symbol of each of n reception signals to sequentially sample the n reception signals for each of the directivities at a time of reception. The antenna section sequentially receives divided reception signals obtained by dividing the reception signal corresponding to the directivity in the sampling period. Each of the signal transmitting and receiving units individually demodulates the reception signal corresponding to the divided reception signals that correspond to the directivity of the signal transmitting and receiving unit and have been sequentially acquired at a timing of the connection to the multiplexer.

公开(公告)号：US10998627B2

公开(公告)日：2021-05-04

申请号：US16757949

申请日：2018-10-23

Applicant: NEC CORPORATION ,  TOKYO INSTITUTE OF TECHNOLOGY

Inventor： Kenichi Okada ,  Keiichi Motoi ,  Naoki Oshima ,  Rui Wu ,  Jian Pang

IPC: H04M1/00 ,  H01Q3/36 ,  H01Q3/28 ,  H01Q21/22 ,  H04B7/06 ,  H04L5/00

Abstract: A phase adjustment circuit includes: a local frequency band phase shifter that adjusts a phase of a signal in a local signal frequency band and that outputs the adjusted signal; a frequency-converting mixer that receives the adjusted signal and another signal different from the adjusted signal, and that mixes the adjusted signal with the other signal; and a buffer amplifier that is provided between the local frequency band phase shifter and the frequency-converting mixer, and that is capable of amplifying an input power that is to be input to the frequency-converting mixer so that the input power is up to be in an input power range in which an input-output characteristic of power of the frequency-converting mixer is out of a linear region.