公开(公告)号：US20230388015A1

公开(公告)日：2023-11-30

申请号：US18118463

申请日：2023-03-07

Applicant: NEC Corporation

Inventor： Ankith Vinayachandran ,  Shinsuke Fujisawa ,  Naoto Ishii ,  Emmanuel Le Taillandier de Gabory

IPC: H04B10/2507 ,  H04B10/69

CPC classification number: H04B10/2507 ,  H04B10/697

Abstract: This disclosure relates to a signal processing system for an optical communication system including an optical transmitter and an optical receiver. The signal processing system is configured to: identify a distortion of input signals from an optical receiver in an unsupervised manner to output distortion parameters indicating the distortion identified; and utilize the outputted distortion parameters to modify signal inputted to an optical transmitter.

公开(公告)号：US11671963B2

公开(公告)日：2023-06-06

申请号：US17471627

申请日：2021-09-10

Applicant: NEC Corporation

Inventor： Le Liu ,  Yoshikazu Kakura ,  Naoto Ishii ,  Takamichi Inoue

IPC: H04W72/1273 ,  H04J11/00 ,  H04L5/00 ,  H04B7/024 ,  H04W48/12 ,  H04W84/04 ,  H04W72/12 ,  H04W72/23

CPC classification number: H04W72/1273 ,  H04B7/024 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/0053 ,  H04W48/12 ,  H04W72/12 ,  H04W72/23 ,  H04W84/042

Abstract: A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

公开(公告)号：US09787378B2

公开(公告)日：2017-10-10

申请号：US14764736

申请日：2014-01-27

Applicant: NEC Corporation

Inventor： Shinichi Tajima ,  Naoto Ishii ,  Yoshikazu Kakura

IPC: H04B7/02 ,  H04B7/0456 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04W88/02 ,  H04W88/08

CPC classification number: H04B7/0456 ,  H04B7/0478 ,  H04B7/0617 ,  H04B7/0639 ,  H04B7/086 ,  H04W88/02 ,  H04W88/08

Abstract: A communication system, a terminal apparatus, a base station apparatus, and a method for sharing a codebook are provided that make it possible to improve system capacity by using precoding according to a cell environment. In a communication system in which beam directivity control is performed by precoding using a codebook that is common between a base station (10) and a terminal (20), the base station (10) notifies the terminal (20) information for codebook determination k including cell (11)-specific information on the base station, and the base station (10) and the terminal (20) generate the common codebook based on the information for codebook determination.

公开(公告)号：US11831347B2

公开(公告)日：2023-11-28

申请号：US17641187

申请日：2020-09-02

Applicant: NEC Corporation

Inventor： Masaaki Tanio ,  Norifumi Kamiya ,  Naoto Ishii

IPC: H04B1/04 ,  G06N3/08

CPC classification number: H04B1/0475 ,  G06N3/08

Abstract: A parameter determination apparatus (2) includes: a first learning device (2111) learning a weight between a [j−1]-th layer (j is an integer that satisfies a condition that “2≤j≤the number of the layer”) and a [j]-th layer to which an output of the [j−1]-th layer is inputted among a plurality of layers of a neural network; a selecting device (2112) selecting at least one valid path for each node included in the [j]-th layer from a plurality of connection paths that connect nodes in the [j−1]-th layer and nodes in the [j]-th layer, respectively, on the basis of the weight learned by the first learning device; and a second learning device (2113) learning at least one of the weight and a bias as the parameters relating to a network structure between the [j−1]-th layer and the [j]-th layer on the basis of the sample signal, the label signal and the valid path.

公开(公告)号：US11777585B2

公开(公告)日：2023-10-03

申请号：US17899086

申请日：2022-08-30

Applicant: NEC CORPORATION ,  OSAKA UNIVERSITY ,  THE DOSHISHA

Inventor： Takanobu Doi ,  Kazushi Muraoka ,  Naoto Ishii ,  Takumi Takahashi ,  Shinsuke Ibi

IPC: H04B7/08

CPC classification number: H04B7/086

Abstract: A wireless receiving apparatus generates an N′×B′ weight matrix W whose columns are orthogonal to each other by decomposing an estimated N′×M′ channel matrix into the N′×B′ weight matrix W and a B′×M′ matrix containing two or more non-zero matrix elements in each column, where B′ is an integer less than or equal to N′-1 and greater than or equal to M′. Alternatively, the wireless receiving apparatus generates a combination of an N′×B′ sub-weight matrix W1 and at least one second sub-weight matrix, where the product of the sub-weight matrix W1 with the at least one second sub-weight matrix is equal to the weight matrix W. The wireless receiving apparatus performs receive beamforming on received signals of N′ receiving antennas using the weight matrix W or the sub-weight matrix W1. The wireless receiving apparatus then performs a BP algorithm using receive-beamformed signals.

公开(公告)号：US10686637B2

公开(公告)日：2020-06-16

申请号：US15550107

申请日：2016-02-15

Applicant: NEC Corporation

Inventor： Yasunori Futatsugi ,  Naoto Ishii

IPC: H04L27/26 ,  H04B17/336 ,  H04J11/00

Abstract: The present invention improves reception characteristics of a receiving apparatus based on OFDM. The receiving apparatus includes: a window timing selection unit that determines Fourier transform window start and end timings for a received signal(s) based on OFDM, based on a signal-to-interference power ratio and signal power in a Fourier transform window; and a Fourier transform unit that performs Fourier transform on the received signal(s) in accordance with the Fourier transform window start and end timings outputted by the window timing selection unit.

公开(公告)号：US10285192B2

公开(公告)日：2019-05-07

申请号：US15459410

申请日：2017-03-15

Applicant: NEC Corporation

Inventor： Le Liu ,  Yoshikazu Kakura ,  Naoto Ishii ,  Takamichi Inoue

IPC: H04W72/12 ,  H04B7/024 ,  H04J11/00 ,  H04L5/00 ,  H04W48/12 ,  H04W84/04

Abstract: A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

公开(公告)号：US12016020B2

公开(公告)日：2024-06-18

申请号：US18508558

申请日：2023-11-14

Applicant: NEC Corporation

Inventor： Le Liu ,  Yoshikazu Kakura ,  Naoto Ishii ,  Takamichi Inoue

IPC: H04W72/1273 ,  H04B7/024 ,  H04J11/00 ,  H04L5/00 ,  H04W48/12 ,  H04W72/12 ,  H04W72/23 ,  H04W84/04

CPC classification number: H04W72/1273 ,  H04B7/024 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/0053 ,  H04W48/12 ,  H04W72/12 ,  H04W72/23 ,  H04W84/042

Abstract: A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

公开(公告)号：US20240097791A1

公开(公告)日：2024-03-21

申请号：US18275484

申请日：2021-02-08

Applicant: NEC Corporation

Inventor： Ankith Vinayachandran ,  Emmanuel Le Taillandier de Gabory ,  Naoto Ishii ,  Norifumi Kamiya

IPC: H04B10/516 ,  H04B10/2507

CPC classification number: H04B10/516 ,  H04B10/2507

Abstract: A symbol constellation generation apparatus (2000) acquires specification information (10) of the optical communication system (100). The symbol constellation generation apparatus (2000) uses a first prediction model (50) to generate noise characteristics information (20) based on the specification information (10). The symbol constellation generation apparatus (2000) uses a second prediction model (60) to generate symbol constellation (30) suited to the optical communication system having the noise characteristics represented by the noise characteristics information (20).

公开(公告)号：US11864180B2

公开(公告)日：2024-01-02

申请号：US18134917

申请日：2023-04-14

Applicant: NEC Corporation

Inventor： Le Liu ,  Yoshikazu Kakura ,  Naoto Ishii ,  Takamichi Inoue

IPC: H04W72/1273 ,  H04J11/00 ,  H04L5/00 ,  H04W72/12 ,  H04W72/23 ,  H04B7/024 ,  H04W48/12 ,  H04W84/04

CPC classification number: H04W72/1273 ,  H04B7/024 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/0053 ,  H04W48/12 ,  H04W72/12 ,  H04W72/23 ,  H04W84/042

Abstract: A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.