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    Channel covariance feedback for enhanced FD-MIMO
    22.
    发明授权
    Channel covariance feedback for enhanced FD-MIMO 有权

    公开(公告)号：US11632208B2

    公开(公告)日：2023-04-18

    申请号：US16078434

    申请日：2017-02-17

    Applicant: QUALCOMM Incorporated

    Inventor： Bo Chen ,  Chao Wei ,  Liangming Wu ,  Neng Wang

    IPC: H04B7/0417 ,  H04L5/00 ,  H04B7/06 ,  H04B7/0413 ,  H04W24/08 ,  H04W24/10

    Abstract: Channel covariance feedback is disclosed for enhanced full-dimension multiple input, multiple output (eFD-MIMO) systems. Channel state information (CSI) reference signal (CSI-RS) feedback operations are implemented using spatial covariance feedback of a covariance estimate. After obtaining a set of orthogonal basis vectors, a user equipment (UE) measures the CSI-RS from a base station and determines the spatial covariance matrix from the signal. The UE may then compress the spatial covariance matrix into a lower-dimension covariance estimate matrix using the orthogonal basis vectors. The lower-dimension matrix along with element-wise quantization allows for feedback of spatial covariance for eFD-MIMO systems without excessive feedback overhead.

    Techniques for a hybrid automatic repeat request (HARQ) mechanism with polar codes
    25.
    发明授权
    Techniques for a hybrid automatic repeat request (HARQ) mechanism with polar codes 有权

    公开(公告)号：US10721029B2

    公开(公告)日：2020-07-21

    申请号：US16091081

    申请日：2017-03-03

    Applicant: QUALCOMM Incorporated

    Inventor： Changlong Xu ,  Jian Li ,  Chao Wei ,  Neng Wang ,  Jilei Hou

    IPC: H04L1/18 ,  H04L1/00 ,  H04L5/00 ,  H03M13/13 ,  H03M13/00

    Abstract: The present disclosure describes a method, an apparatus, and a computer readable medium for hybrid automatic repeat request (HARQ) transmissions. For example, the method may include generating a first codeword for a first information block, wherein the first codeword is a first polar code, and wherein the first information block includes cyclic redundancy check (CRC) bits; transmitting the first codeword to a receiver; determining that the first polar code is not successfully decoded at the receiver based at least on a first message received from the receiver; generating a second codeword for a second information block, wherein the second codeword is a first enhanced polar code, and wherein the second information block does not include any CRC bits; transmitting the second codeword to the receiver; and determining that the second codeword and the first codeword are successfully decoded at the receiver based at least on a second message received from the receiver.

    UE-RS-based open-loop and semi-open-loop MIMO
    29.
    发明授权
    UE-RS-based open-loop and semi-open-loop MIMO 有权

    公开(公告)号：US11336344B2

    公开(公告)日：2022-05-17

    申请号：US17092764

    申请日：2020-11-09

    Applicant: QUALCOMM Incorporated

    Inventor： Chao Wei ,  Wanshi Chen ,  Peter Gaal ,  Hao Xu ,  Neng Wang ,  Xiaohui Liu ,  Jilei Hou

    IPC: H04B7/06 ,  H04B7/0456 ,  H04L5/00 ,  H04L27/26

    Abstract: Design of precoding and feedback for user equipment (UE)-specific reference signals (UE-RS)-based open-loop and semi-open-loop multiple input, multiple output (MIMO) systems is discussed. Aspects of the present disclosure provide for sub-resource block (RB) random precoding that allows for greater diversity gain in a lower bandwidth. In addition, the recoding may be performed using resource element (RE)-level layer shifting that provides for a number of precoders to be assigned to a number of layers for every such continuous subcarrier. As such, two codewords may experience the same effective channel quality with channel quality indicators (CQI) being averaged across all of the layers.

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