公开(公告)号：US20250070877A1

公开(公告)日：2025-02-27

申请号：US18726472

申请日：2022-01-18

Applicant: NEC Corporation

Inventor： Ankith VINAYACHANDRAN ,  Shinsuke FUJISAWA ,  Naoto ISHII ,  Hidemi NOGUCHI ,  Emmanuel LE TAILLANDIER DE GABORY

IPC: H04B10/2507 ,  H04B10/58 ,  H04B10/60

Abstract: A calibration apparatus trains a first machine learning-based model with a first training dataset to determine configuration parameters of an intermediate pre-distortion compensator in an optical communication system that includes a transmitter, a receiver, and an optical communication channel. The transmitter includes a pre-distortion compensator, the intermediate pre-distortion compensator, and an MZM compensator. The calibration apparatus trains a second machine learning-based model with a second training dataset to determine configuration parameters of the post-distortion compensator in the receiver. The calibration apparatus trains a third machine learning-based model with a third training dataset to determine configuration parameters of the pre-distortion compensator. When generating the second training data, the intermediate pre-distortion compensator is configured with the configuration parameters generated using the first machine learning-based model. When generating the third training data, the post-distortion compensator is configured with the configuration parameters generated using the second machine learning-based model.

公开(公告)号：US20240106550A1

公开(公告)日：2024-03-28

申请号：US18222584

申请日：2023-07-17

Applicant: NEC Corporation

Inventor： Takanobu DOI ,  Kazushi MURAOKA ,  Naoto ISHII ,  Jun SHIKIDA

IPC: H04B17/21 ,  H04B17/336

CPC classification number: H04B17/21 ,  H04B17/336

Abstract: A base station, a method for a base station, and a program capable of appropriately selecting radio terminals for which spatial multiplexing is performed and an MCS, and thereby increasing throughput in multi-user MIMO are provided. A base station 11 according to the present disclosure includes: a correction parameter storage unit 1141 configured to store a plurality of correction parameters for each of a plurality of radio terminals 12, the plurality of correction parameters being provided for each of the radio terminals 12; a correction parameter selection unit 1131 configured to select a predetermined correction parameter from among the plurality of correction parameters based on a combination of radio terminals 12 that are spatially multiplexed in the same radio resource; a correction value calculation unit 1132 configured to calculate a correction value of the radio terminal 12 based on the predetermined correction parameter.

公开(公告)号：US20220030608A1

公开(公告)日：2022-01-27

申请号：US17471627

申请日：2021-09-10

Applicant: NEC Corporation

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

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

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：US20210328654A1

公开(公告)日：2021-10-21

申请号：US17228832

申请日：2021-04-13

Applicant: NEC Corporation

Inventor： Jun SHIKIDA ,  Naoto ISHII

IPC: H04B7/08

Abstract: A control apparatus includes a determination unit configured to determine first and second reception weight matrixes by using first and second channel matrixes between first and second radio apparatuses and the first and second terminals, a first calculation unit configured to calculate a data channel matrix of a data signal transmitted from the first radio apparatus to the first terminal by using the first channel matrix and the first reception weight matrix, a second calculation unit configured to calculate an interference channel matrix of interference to the second terminal caused by the first radio apparatus by using a third channel matrix between the first radio apparatus and the second terminal and the second reception weight matrix, and a third calculation unit configured to calculate a transmission weight matrix for transmitting a data signal so that the interference is suppressed by using the data channel matrix and the interference channel matrix.

公开(公告)号：US20210126683A1

公开(公告)日：2021-04-29

申请号：US17078595

申请日：2020-10-23

Applicant: NEC CORPORATION

Inventor： Jun SHIKIDA ,  Naoto ISHII

IPC: H04B7/0456 ,  H04L5/00

Abstract: A control apparatus includes a calculation unit configured to calculate, for each of radio apparatuses, a combination of a pre-coding weight and a post-coding weight using a first channel information matrix based on estimated values of channel responses between each of the radio apparatuses and each of terminals, a selection unit configured to select one combination from the combinations calculated using the first channel information matrices as a first combination, and an orthogonalization unit configured to generate a second channel information matrix for each of the radio apparatuses by projecting each first channel information matrix onto the subspace that is orthogonal to the post-coding weight included in the first combination. The calculation unit calculates a combination for each of the radio apparatuses using a second channel information matrix, and the selection unit selects one combination from the combinations calculated using the second channel information matrix as a second combination.

公开(公告)号：US20200274591A1

公开(公告)日：2020-08-27

申请号：US16753697

申请日：2017-10-04

Applicant: NEC Corporation

Inventor： Dileep KUMAR ,  Kazushi MURAOKA ,  Naoto ISHII

IPC: H04B7/06 ,  H04W88/08 ,  H04W24/08 ,  H04W16/28

Abstract: A RRH has multiple antennas in a wireless communication system. The RRH generates a plurality of analog beams to serve at least one user terminal. The RRH includes a parameter calculator, a metric calculator and a beam former. The parameter calculator is configured to calculate at least one parameter including an un-scanned duration for each spatial direction. The metric calculator is configured to calculate at least one metric based on the calculated parameter(s) for each the spatial direction. The beam former is configured to generate analog beams directed towards spatial direction(s) according to the calculated metric(s).

公开(公告)号：US20200245412A1

公开(公告)日：2020-07-30

申请号：US16652731

申请日：2017-10-04

Applicant: NEC Corporation

Inventor： Dileep KUMAR ,  Kazushi MURAOKA ,  Naoto ISHII

IPC: H04W88/08 ,  H04B7/06 ,  H04B7/024 ,  H04W16/28 ,  H04W24/02

Abstract: Provided a Remote Radio Head (RRH) with multiple antennas generating a plurality of analog beams in a wireless communication system serving at least one user terminal, including a metric calculator that calculates at least one metric representing a traffic demand as a function of spatial direction by using at least a signal of each Radio Frequency chain and a beam former that generates analog beams directed towards a spatial direction determined based on the calculated at least one metric.

公开(公告)号：US20200212971A1

公开(公告)日：2020-07-02

申请号：US16616681

申请日：2018-05-28

Applicant: NEC Corporation

Inventor： Jun SHIKIDA ,  Naoto ISHII

IPC: H04B7/0456 ,  H04B17/318 ,  H04W16/28 ,  H04L25/02

Abstract: A wireless apparatus includes a first weight multiplication part, a channel estimation part, a channel response conversion part, and a second weight generation part. The first weight multiplication part includes first weights, each of which corresponds to an individual one of a plurality of beams, and multiplies a signal(s) corresponding to a reference signal(s) transmitted from a wireless terminal(s) by the first weights. The channel estimation part estimates first channel responses for the respective beams by using the signals obtained by the multiplication by the first weights. The channel response conversion part converts the first channel responses into second channel responses by using the first weights. The second weight generation part generates second weights used for wireless communication with the wireless terminal(s) by using the second channel responses.

公开(公告)号：US20170244513A1

公开(公告)日：2017-08-24

申请号：US15521844

申请日：2014-10-29

Applicant: NEC Corporation

Inventor： Boonsarn PITAKDUMRONGKIJA ,  Naoto ISHII

IPC: H04L1/00 ,  H04B7/06 ,  H04L5/00 ,  H04B7/0456

CPC classification number: H04L1/0003 ,  H04B7/0452 ,  H04B7/0456 ,  H04B7/0617 ,  H04L1/0026 ,  H04L5/0048 ,  H04L5/0053 ,  H04L25/0391

Abstract: Provided a method in a mobile communication system comprising a base station adapted to create a precoding matrix for applying to data to be transmitted to a user terminal by using a channel estimate determined from a Reference Signal (RS) transmitted from the user terminal to the base station, the user terminal being adapted to transmit to the base station a Channel State Information (CSI) report, wherein the method comprises: the base station creating a relationship between the received CSI report and Interference pluses Noise covariance matrix that reflects amount of interference and noise observed at the user terminal's antennas, the base station determining the Interference pluses Noise covariance matrix based on the created relationship, and the base station using the determined Interference pluses Noise covariance matrix to estimate SINR for each data layer conditioned on the precoding matrix.

公开(公告)号：US20160248495A1

公开(公告)日：2016-08-25

申请号：US15031798

申请日：2014-05-22

Applicant: NEC CORPORATION

Inventor： Jun SHIKIDA ,  Naoto ISHII

IPC: H04B7/06 ,  H04L5/00 ,  H04B7/04

CPC classification number: H04B7/0617 ,  H04B7/0413 ,  H04L5/0007 ,  H04L27/2647

Abstract: A radio communication apparatus provided with a plurality of antennas (101-1 to 101-M) includes: a channel information acquisition unit (105) that acquires information related to channels between the radio communication apparatus and another radio communication apparatus; an index calculation unit (106) that uses that information to calculate indices related to an angular spread of the channels; a weighting factor generation unit (107) that uses that information and the indices to generate weighting factors corresponding to the respective antennas; and a weighting factor multiplication unit (110) that multiplies signals to be processed by each antenna by the weighting factor corresponding to the antenna that processes the signal.

Abstract translation: 具备多个天线（101-1〜101-M）的无线通信装置包括：信道信息获取单元，其获取与所述无线通信装置与所述无线通信装置之间的信道有关的信息; 索引计算单元，使用该信息来计算与频道的角度扩展有关的索引; 加权因子生成单元，其使用该信息和索引来生成与各个天线对应的加权因子; 以及加权因子乘法单元（110），其将由每个天线处理的信号乘以对应于处理该信号的天线的加权因子。