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    Precoding with a codebook for a wireless system
    32.
    发明授权
    Precoding with a codebook for a wireless system 有权
    用无线系统的码本进行预编码

    公开(公告)号：US09444536B2

    公开(公告)日：2016-09-13

    申请号：US14819734

    申请日：2015-08-06

    Applicant: NEC Corporation

    Inventor： Mohammad Khojastepour

    IPC: H04B7/04 ,  H04B7/06 ,  H04W52/42

    CPC classification number: H04B7/0617 ,  H04B7/04 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/046 ,  H04B7/0486 ,  H04W52/42 ,  H04W88/02 ,  H04W88/08

    Abstract: A base station used in a wireless communications system with multiple transmission ranks is disclosed. The base station comprises a memory to store a codebook for a transmission rank, a beamforming controller to precode data with a precoding matrix selected from the codebook, and a transmitter to transmit the precoded data to a user equipment, wherein the precoding matrix is selected according to a first description and a second description, which are unique to the precoding matrix, and wherein the second description provides a finer description of the codebook than the first description. Other methods, systems, and apparatuses also are disclosed.

    Abstract translation: 公开了一种在具有多个传输级别的无线通信系统中使用的基站。 基站包括存储器，用于存储用于传输等级的码本，波束成形控制器，用从码本中选择的预编码矩阵预编码数据;以及发射机，用于将预编码数据发送到用户设备，其中，预编码矩阵根据 涉及预编码矩阵唯一的第一描述和第二描述，并且其中第二描述提供了与第一描述相比对码本的更精细的描述。 还公开了其它方法，系统和装置。

    4TX codebook enhancement in LTE
    34.
    发明授权
    4TX codebook enhancement in LTE 有权

    公开(公告)号：US09425871B2

    公开(公告)日：2016-08-23

    申请号：US15055195

    申请日：2016-02-26

    Applicant: TEXAS INSTRUMENTS INCORPORATED

    Inventor： Eko Onggosanusi ,  Runhua Chen ,  Ralf Bendlin

    IPC: H04B7/04 ,  H04B7/06

    CPC classification number: H04B7/0456 ,  H04B7/0417 ,  H04B7/046 ,  H04B7/0469 ,  H04B7/0478 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/0639

    Abstract: Channel state information (CSI) feedback in a wireless communication system is disclosed. A precoding matrix is generated for multi-antenna transmission based on precoding matrix indicator (PMI) feedback, wherein the PMI indicates a choice of precoding matrix derived from a matrix multiplication of two matrices from a first codebook and a second codebook. In one embodiment, the first codebook comprises at least a first precoding matrix constructed with a first group of adjacent Discrete-Fourier-Transform (DFT) vectors. In another embodiment, the first codebook comprises at least a second precoding matrix constructed with a second group of uniformly distributed non-adjacent DFT vectors. In yet another embodiment, the first codebook comprises at least a first precoding matrix and a second precoding matrix, where said first precoding matrix is constructed with a first group of adjacent DFT vectors, and said second precoding matrix is constructed with a second group of uniformly distributed non-adjacent DFT vectors.

    Positioning of Wireless Devices
    36.
    发明申请
    Positioning of Wireless Devices 有权
    无线设备定位

    公开(公告)号：US20160212738A1

    公开(公告)日：2016-07-21

    申请号：US14913544

    申请日：2013-08-27

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

    Inventor： Magnus THURFJELL ,  Kjell LARSSON ,  Peter ÖKVIST

    IPC: H04W72/04 ,  H04L5/00 ,  H04B7/04

    CPC classification number: H04W72/048 ,  G01S1/44 ,  G01S3/38 ,  G01S5/12 ,  H04B7/0408 ,  H04B7/0456 ,  H04B7/046 ,  H04B7/0617 ,  H04B7/0639 ,  H04L5/0051 ,  H04L25/03 ,  H04L25/03949 ,  H04W64/00

    Abstract: A method performed by a network node (10) for finding a direction to a wireless device (20) in a wireless communication network is provided. The method comprises the step (S1) of the network node transmitting reference signal pairs on at least one pair of correlated antennas. Each reference signal pair has a unique phase difference between the signals in the signal pair, and the unique phase differences of the reference signal pairs are distributed over a given angular interval. The method further comprises the step (S2) of the network node receiving from the wireless device, in response to each pair of reference signals, a respective indication of a preferred pre-coding matrix, and the step (S3) of the network node determining a direction to the wireless device based on the received indications, information representative of the phase differences of the reference signal pairs, and phase information related to the indicated preferred pre-coding matrices.

    Abstract translation: 提供了一种由网络节点（10）执行的用于在无线通信网络中找到无线设备（20）的方向的方法。 该方法包括网络节点在至少一对相关天线上发送参考信号对的步骤（S1）。 每个参考信号对在信号对中的信号之间具有唯一的相位差，并且参考信号对的唯一相位差在给定的角度间隔上分布。 该方法还包括网络节点从无线设备接收的响应于每对参考信号的优选预编码矩阵的相应指示的步骤（S2），以及网络节点确定的步骤（S3） 基于接收到的指示到无线设备的方向，表示参考信号对的相位差的信息以及与所指示的优选预编码矩阵相关的相位信息。

    Low Complexity Soft Output MIMO Decoder
    38.
    发明申请
    Low Complexity Soft Output MIMO Decoder 审中-公开

    公开(公告)号：US20160164582A1

    公开(公告)日：2016-06-09

    申请号：US15019651

    申请日：2016-02-09

    Applicant: Imagination Technologies Limited

    Inventor： Sriram Kankipati ,  Somya Sharma ,  Vellenki Umapathireddy

    IPC: H04B7/04

    CPC classification number: H04B7/0456 ,  H04B7/046 ,  H04B7/0882 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/03318

    Abstract: A method and processing block for receiving data transmitted in a MIMO system is provided. Data is transmitted as a transmit vector of values from multiple transmitting antennas and received as a receive vector of values at multiple receiving antennas. Candidate vectors are determined based on each of a plurality of constellation points of the constellation configuration used in the transmission scheme. A channel matrix is decomposed into a unitary matrix and a triangular matrix, such that a relationship links: (i) a function of the unitary matrix and the receive vector, and (ii) a multiplication of the triangular matrix and the transmit vector. A best candidate vector from the set of candidate vectors is utilized for the computation of soft bits representing the values of the transmit vector.

    METHOD AND APPARATUS FOR MAPPING VIRTUAL ANTENNA TO PHYSICAL ANTENNA
    39.
    发明申请
    METHOD AND APPARATUS FOR MAPPING VIRTUAL ANTENNA TO PHYSICAL ANTENNA 有权
    用于将虚拟天线映射到物理天线的方法和装置

    公开(公告)号：US20160149619A1

    公开(公告)日：2016-05-26

    申请号：US14937960

    申请日：2015-11-11

    Applicant: Electronics and Telecommunications Research Institute

    Inventor： Seok Ho WON ,  Seyoung CHO ,  Suchang CHAE ,  Il Gyu KIM ,  Seung Chan BANG

    IPC: H04B7/04 ,  H04L5/00

    CPC classification number: H04B7/046 ,  H04B7/0417 ,  H04B7/0669

    Abstract: A transmitter generates a first precoding vector for a first virtual antenna port among a plurality of virtual antenna ports using a first sequence having a constant magnitude and a discrete Fourier transform (DFT) vector sequence in a time domain and a frequency domain. The transmitter generates a plurality of second precoding vectors for the remaining virtual antenna port, except for the first virtual antenna port of the plurality of virtual antenna ports by circular shifting the first precoding vector. The transmitter maps a plurality of first data streams for the plurality of virtual antenna ports to a plurality of physical antenna ports using the first precoding vector and the plurality of second precoding vectors.

    Abstract translation: 发射机使用具有恒定幅度的第一序列和在时域和频域中的离散傅里叶变换（DFT）矢量序列来生成多个虚拟天线端口中的第一虚拟天线端口的第一预编码矢量。 发射机通过循环移位第一预编码矢量，除了多个虚拟天线端口中的第一虚拟天线端口之外，为剩余的虚拟天线端口生成多个第二预编码向量。 发射机使用第一预编码向量和多个第二预编码向量将多个虚拟天线端口的多个第一数据流映射到多个物理天线端口。

    Transmitting apparatus, receiving apparatus, transmitting method and receiving method that wirelessly communicate with each other using plurality of antennas
    40.
    发明授权
    Transmitting apparatus, receiving apparatus, transmitting method and receiving method that wirelessly communicate with each other using plurality of antennas 有权
    使用多个天线进行无线通信的发送装置，接收装置，发送方法和接收方法

    公开(公告)号：US09350433B2

    公开(公告)日：2016-05-24

    申请号：US14260016

    申请日：2014-04-23

    Applicant: JVC KENWOOD Corporation

    Inventor： Seiwa Nojiri

    IPC: H04W4/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08

    CPC classification number: H04B7/046 ,  H04B7/0413 ,  H04B7/0615 ,  H04B7/0842

    Abstract: An acquiring unit acquires a channel matrix, which has elements representing the channel characteristics between a plurality of antennas at a transmitting side and a plurality of antennas at a receiving side, respectively. A first derivation unit derives not only a singular value matrix that is a diagonal matrix where singular values are arranged, by subjecting the channel matrix to the singular value decomposition, but also a weight matrix which is a unitary matrix corresponding to the singular value matrix. A second derivation unit derives the degree of difference between the singular values arranged in the singular value matrix. A determining unit determines whether or not the degree of difference lies within a predetermined range.

    Abstract translation: 获取单元获取信道矩阵，其具有分别表示发送侧的多个天线和接收侧的多个天线之间的信道特性的元素。 第一导出单元不仅通过对信道矩阵进行奇异值分解而且通过对应于奇异值矩阵的酉矩阵的权重矩阵，而导出奇异值矩阵，该奇异值矩阵是奇异值排列的对角矩阵。 第二推导单元导出排列在奇异值矩阵中的奇异值之间的差异程度。 确定单元确定差异程度是否在预定范围内。

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