公开(公告)号：US20240022312A1

公开(公告)日：2024-01-18

申请号：US18218887

申请日：2023-07-06

Applicant: NEC Corporation

Inventor： Jun SHIKIDA ,  Kazushi MURAOKA

IPC: H04B7/08 ,  H04B7/0408

CPC classification number: H04B7/088 ,  H04B7/0408

Abstract: A control apparatus controls a communication with a plurality of wireless terminals using a plurality of beams. The control apparatus calculates an index indicating a relationship between the plurality of beams, on the basis of a first information about a success/failure of a communication with at least two of the plurality of wireless terminals, and a second information indicating a combination pattern of at least two of the plurality of beams that are used a communication whose success/failure is indicated by the first information; and selects, from among the plurality of wireless terminals and the plurality of beams, a combination of at least one wireless terminal serving as a communication target and at least one beam used to communicate with the at least one wireless terminal, on the basis of the index.

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：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：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。

公开(公告)号：US20150312796A1

公开(公告)日：2015-10-29

申请号：US14650045

申请日：2013-12-06

Applicant: NEC Corporation

Inventor： Jun SHIKIDA ,  Hiroto SUGAHARA ,  Hiroaki AMINAKA

IPC: H04W28/02 ,  H04J13/00 ,  H04L5/00 ,  H04B17/26

CPC classification number: H04W28/0247 ,  H04B17/26 ,  H04B17/327 ,  H04J13/00 ,  H04L5/005 ,  H04W24/08

Abstract: A method for estimating a network communication load without performing actual communication and a wireless communication terminal are provided. A wireless communication terminal (10) connectable to a network (NW) includes a load estimation section (14), and the load estimation section (14) estimates a communication load of the network NW by using a first quality index that does not depend on a network communication load and a second communication index that depends on a network communication load.

Abstract translation: 提供一种用于在不执行实际通信的情况下估计网络通信负载的方法和无线通信终端。 可连接到网络（NW）的无线通信终端（10）包括负载估计部（14），负载估计部（14）通过使用不依赖于第一质量指标的第一质量指标来估计网络NW的通信负荷 网络通信负载和依赖于网络通信负载的第二通信索引。