公开(公告)号：US20150372729A1

公开(公告)日：2015-12-24

申请号：US14764736

申请日：2013-01-31

Applicant: NEC CORPORATION

Inventor： Shinichi TAJIMA ,  Naoto ISHII ,  Yoshikazu KAKURA

IPC: H04B7/04 ,  H04B7/08

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.

Abstract translation: 提供一种通信系统，终端装置，基站装置以及用于共享码本的方法，可以通过使用根据小区环境的预编码来提高系统容量。 在通过使用基站（10）和终端（20）之间共有的码本进行预编码来进行波束方向性控制的通信系统中，基站（10）向终端（20）通知码本确定k 包括基站上的小区（11）特定信息，并且基站（10）和终端（20）基于码本确定信息生成公共码本。

公开(公告)号：US20150318966A1

公开(公告)日：2015-11-05

申请号：US14649171

申请日：2012-12-05

Applicant: Le LIU ,  Naoto ISHII ,  NEC Corporation

Inventor： Le LIU ,  Naoto ISHII

IPC: H04L5/00 ,  H04W72/12

CPC classification number: H04L5/0035 ,  H04L5/0073 ,  H04W28/16 ,  H04W72/12 ,  H04W72/1231

Abstract: A radio communication system achieving reduction in interference variation can be provided. In a radio communication system includes a plurality of radio nodes each capable of communicating with a user equipment, wherein at least one radio node includes a scheduler which collects the neighbor node information from neighbor radio nodes and performs coordinated scheduling of multiple coordinated radio nodes using the neighbor node information, wherein the neighbor node information includes information related to the transmit power of the neighbor radio nodes.

Abstract translation: 可以提供实现干扰变化减小的无线电通信系统。 在无线电通信系统中，包括能够与用户设备进行通信的多个无线节点，其中至少一个无线节点包括从相邻无线节点收集邻居节点信息的调度器，并使用该协调无线节点 邻居节点信息，其中所述邻居节点信息包括与所述相邻无线电节点的发射功率相关的信息。

公开(公告)号：US20150304018A1

公开(公告)日：2015-10-22

申请号：US14380674

申请日：2013-02-21

Applicant: NEC CORPORATION

Inventor： Boonsarn PITAKDUMRONGKIJA ,  Yoshikazu KAKURA ,  Naoto ISHII

IPC: H04B7/155 ,  H04W72/04

CPC classification number: H04B7/15592 ,  H04W16/26 ,  H04W72/0446 ,  H04W72/082 ,  H04W84/047 ,  H04W92/20

Abstract: A communication system includes a plurality of DeNBs (base stations) and a plurality of RNs (relay nodes), wherein each RN has a radio connection with a DeNB. Each DeNB acquires time resource configuration applied between another base station and a relay node connected with said another base station.

Abstract translation: 通信系统包括多个DeNB（基站）和多个RN（中继节点），其中每个RN具有与DeNB的无线电连接。 每个DeNB获取在另一基站和与所述另一基站连接的中继节点之间应用的时间资源配置。

公开(公告)号：US20240031026A1

公开(公告)日：2024-01-25

申请号：US17870862

申请日：2022-07-22

Applicant: NEC CORPORATION

Inventor： Shinsuke FUJISAWA ,  Naoto ISHII ,  Ankith VINAYACHANDRAN ,  Emmanuel LE TAILLANDIER DE GABORY ,  Fatih YAMAN ,  Hussam G. BATSHON

IPC: H04B10/2507

CPC classification number: H04B10/2507

Abstract: An optical communication system includes a first terminal device configured to receive first data, wherein the first terminal device is configured to generate an optical waveform based on the received first data. The optical system further includes an optical communication path configured to receive the optical waveform from the first terminal device. The optical system further includes a second terminal device configured to receive the optical waveform from the optical communication path, wherein the second terminal device is configured to output second data based on the optical waveform. At least one of the first terminal device or the second terminal device includes a nonlinear waveform distortion compensation device. The nonlinear waveform compensation device is configured to correct nonlinear waveform distortion resulting from the optical waveform propagating along the optical communication path, and the nonlinear waveform compensation device includes at least one recursive intermediate layer.

公开(公告)号：US20230254858A1

公开(公告)日：2023-08-10

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

CPC classification number: H04W72/1273 ,  H04J11/0053 ,  H04L5/0053 ,  H04L5/0035 ,  H04W72/12 ,  H04W72/23 ,  H04B7/024 ,  H04W48/12 ,  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：US20230075680A1

公开(公告)日：2023-03-09

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

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：US20210021446A1

公开(公告)日：2021-01-21

申请号：US17043308

申请日：2019-01-30

Applicant: NEC CORPORATION

Inventor： Jun SHIKIDA ,  Kazushi MURAOKA ,  Naoto ISHII

IPC: H04L25/02 ,  H04L27/26

Abstract: A radio apparatus (10) includes an estimation unit (2) configured to calculate an estimated value of a channel response for each of a plurality of antennas, a padding unit (3) configured to generate a first antenna-space channel vector having dimensions larger than the number of the antennas by combining the estimated value with a padding value, a spatial transformation unit (4) configured to calculate a first beam-space channel vector by spatial transforming the first antenna-space channel vector, a noise suppression unit (5) configured to generate a second beam-space channel vector by suppressing at least one element of the first beam-space channel vector, an inverse spatial transformation unit (6) configured to calculate a second antenna-space channel vector by inversely and spatial transforming the second beam-space channel vector, and an extraction unit (7) configured to determine an estimated value of each channel based on the second antenna-space channel vector.

公开(公告)号：US20190215853A1

公开(公告)日：2019-07-11

申请号：US16358288

申请日：2019-03-19

Applicant: NEC Corporation

Inventor： Le LIU ,  Yoshikazu KAKURA ,  Naoto ISHII ,  Takamichi INOUE

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

CPC classification number: H04W72/1273 ,  H04B7/024 ,  H04J11/0053 ,  H04L5/0035 ,  H04L5/0053 ,  H04W48/12 ,  H04W72/1205 ,  H04W72/1289 ,  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：US20180013598A1

公开(公告)日：2018-01-11

申请号：US15550107

申请日：2016-02-15

Applicant: NEC Corporation

Inventor： Yasunori FUTATSUGI ,  Naoto ISHII

IPC: H04L27/26 ,  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：US20160295500A1

公开(公告)日：2016-10-06

申请号：US15023275

申请日：2013-09-25

Applicant: NEC CORPORATION

Inventor： Le LIU ,  Naoto ISHII ,  Hisashi FUTAKI ,  Jun SHIKIDA

IPC: H04W48/16 ,  H04W28/02

CPC classification number: H04W48/16 ,  H04W28/0289 ,  H04W84/045

Abstract: In one embodiment, an apparatus, a system or a network (1) sets a discovery period for a node (2B). The discovery period is a time period in which the node (2B) sends a signal (e.g., PSS, SSS, and CRS) necessary for cell detection and radio measurement performed by a user equipment (3A) before a cell (20B), controlled by the node (2B), is to be turned on in order to send a signal (e.g., data signal) for either or both of user data reception and transmission. It is achieved, for example, that the user equipment (3A) is able to detect the signal (e.g., PSS, SSS, and CRS) for cell detection and radio measurement in the discovery period by using legacy behavior of radio measurement.

Abstract translation: 在一个实施例中，设备，系统或网络（1）设置节点（2B）的发现周期。 发现周期是节点（2B）在小区（20B）之前发送由用户设备（3A）执行的小区检测和无线电测量所需的信号（例如，PSS，SSS和CRS）的时间段，被控制 为了发送用户数据接收和发送中的任一个或两者的信号（例如，数据信号），由节点（2B）导通。 例如，通过使用无线电测量的遗留行为，用户设备（3A）能够在发现时段中检测用于小区检测和无线电测量的信号（例如，PSS，SSS和CRS）。