公开(公告)号：US20220190894A1

公开(公告)日：2022-06-16

申请号：US17605088

申请日：2020-04-06

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA ,  Mamoru SAWAHASHI

IPC: H04B7/0456 ,  H04J13/22 ,  H04L27/26

Abstract: A modulation apparatus capable of performing highly efficient multiplexing of pilot signals used for equalization and estimation of phase noises for LOS-MIMO (Line Of Sight-Multiple Input Multiple Output) using a single-carrier signal is provided. The modulation apparatus (10) includes means (11) for transforming a time-domain pilot signal sequence into a first number of frequency-domain signals corresponding to a sequence length of the pilot signal sequence, means (12) for mapping the first number of frequency-domain signals at the same number of subcarrier intervals as a number of transmitting antennas of the modulation apparatus by shifting mapping positions of heads of the frequency-domain signals one after another by an amount equivalent to one subcarrier so that the frequency-domain signals do not overlap each other, and means (13) for transforming the mapped frequency-domain signals into time-domain signals.

公开(公告)号：US20240357428A1

公开(公告)日：2024-10-24

申请号：US18569276

申请日：2022-05-16

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA ,  Mamoru SAWAHASHI

IPC: H04W28/18 ,  H04W16/26 ,  H04W72/0457

CPC classification number: H04W28/18 ,  H04W16/26 ,  H04W72/0457

Abstract: An information processing apparatus (10) includes: an acquisition unit (11) configured to acquire information regarding wireless communication of a back-haul link between a first base station (20A) and a second base station (20B) and information regarding wireless communication of an access link between the second base station and a user terminal; a control unit (12) configured to determine a first wireless communication method of the back-haul link and a second wireless communication method of the access link on the basis of the information acquired by the acquisition unit; and a transmission unit (13) configured to transmit information indicating the first wireless communication method determined by the control unit to at least one of the first base station or the second base station and transmit information indicating the second wireless communication method to at least one of the second base station or the user terminal.

公开(公告)号：US20200092155A1

公开(公告)日：2020-03-19

申请号：US16471958

申请日：2016-12-21

Applicant: NEC CORPORATION

Inventor： Norifumi KAMIYA ,  Mamoru SAWAHASHI

IPC: H04L27/34

Abstract: A modulation device includes a mapping circuit configured to map information bits to signal points on a plurality of concentric rings, when a signal space arrangement in which the number of signal points on all of the plurality of rings is the same is used as a basis, reduce the number of signal points on an innermost ring or a plurality of rings from inner to outer rings from among the plurality of rings, generate a new ring outside the signal space arrangement used as the basis, and arrange, on the generated ring, signal points which achieve the same frequency utilization efficiency as that of the signal space arrangement used as the basis.