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    Method and apparatus for channel estimation using multiple description codes
    5.
    发明授权
    Method and apparatus for channel estimation using multiple description codes 有权
    使用多个描述码进行信道估计的方法和设备

    公开(公告)号：EP2618530B1

    公开(公告)日：2018-03-14

    申请号：EP13164472.6

    申请日：2009-11-29

    申请人： Qualcomm Incorporated

    发明人： Gorokhov, Alexei Y. ,  Mallik, Siddhartha

    IPC分类号： H04L25/02 ,  H04B7/02 ,  H04L1/00

    CPC分类号： H04L1/0035 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0639 ,  H04L25/0242

    摘要： Techniques for using multiple description codes (MDC) for channel feedback to improve channel estimation accuracy are described. A receiver may obtain an initial/ measured channel vector for a communication channel. The receiver may select a codebook in a set of codebooks for quantizing the initial channel vector. Each codebook may include a different set of channel vectors/codewords. Different codebooks may be selected in different reporting intervals. The receiver may select a channel vector in the selected codebook, and the selected channel vector may have (i) a largest correlation with a normalized channel vector or (ii) a smallest distance to the initial channel vector. The receiver may send the selected channel vector and possibly the selected codebook to a transmitter. The transmitter may receive the selected/ reported channel vectors from the receiver in different reporting intervals and may derive a final channel vector for the communication channel based on the reported channel vectors.

    METHOD FOR ESTIMATING CHANNEL STATES OF PLURALITY OF USER EQUIPMENTS (UES)
    6.
    发明公开
    METHOD FOR ESTIMATING CHANNEL STATES OF PLURALITY OF USER EQUIPMENTS (UES) 审中-公开
    用于评估多个用户设备的信道状态的方法（UES）

    公开(公告)号：EP3276901A1

    公开(公告)日：2018-01-31

    申请号：EP16203018.3

    申请日：2016-12-08

    申请人： Indian Institute Of Technology Hyderabad

    发明人： KUCHI, Kiran Kumar ,  KHAN, Makandar Sibgath Ali

    IPC分类号： H04L25/02

    CPC分类号： H04L25/0242 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/0244 ,  H04L25/0258

    摘要： Embodiments herein provide a method of estimating channel states of a plurality of user equipments (UEs) in a single instance. The method includes receiving pilot samples from the plurality of UEs. The method includes selecting a predetermined number of tones, wherein the channel associated with each UE across the selected pre-determined number of tones is same. The method includes collecting the received pilot samples from each pilot symbol and stacking the received pilot samples as a vector. Further, the method includes constructing a matrix. The matrix includes known pilot values used by each UE. Furthermore, the method includes estimating channel states of the plurality of UEs by applying a filter on the vector formed from the received pilot samples. The number of channel states to be estimated is reduced by selecting the pre-determined number of tones.

    摘要翻译： 这里的实施例提供了一种在单个实例中估计多个用户设备（UE）的信道状态的方法。 该方法包括从多个UE接收导频样本。 该方法包括选择预定数量的音调，其中跨越所选择的预定数量的音调与每个UE相关联的信道是相同的。 该方法包括从每个导频符号收集接收到的导频样本并且将接收到的导频样本作为矢量进行叠加。 此外，该方法包括构建矩阵。 矩阵包括每个UE使用的已知导频值。 此外，该方法包括通过对由接收到的导频样本形成的向量应用滤波器来估计多个UE的信道状态。 通过选择预定数量的音调来减少要估计的信道状态的数量。

    DMRS ENHANCEMENT FOR HIGHER ORDER MU-MIMO
    7.
    发明公开
    DMRS ENHANCEMENT FOR HIGHER ORDER MU-MIMO 审中-公开
    针对高阶MU-MIMO的DMRS增强

    公开(公告)号：EP3257210A1

    公开(公告)日：2017-12-20

    申请号：EP16748740.4

    申请日：2016-02-09

    申请人： Qualcomm Incorporated

    发明人： WEI, Chao ,  CHEN, Wanshi ,  GAAL, Peter ,  LI, Guodong ,  HOU, Jilei

    IPC分类号： H04L27/26 ,  H04W88/08

    CPC分类号： H04B7/0452 ,  H04B7/0456 ,  H04L5/0007 ,  H04L5/0021 ,  H04L5/0048 ,  H04L25/0242 ,  H04W72/0453 ,  H04W72/1289

    摘要： Certain aspects of the present disclosure support demodulation reference signal (DMRS) enhancement for higher order multi-user multiple-input multiple-output (MU-MIMO) communications. An example method generally includes determining a plurality of ports of a multi-dimensional array of transmit antennas and a number of spatial multiplexed layers for transmission to a plurality of user equipments (UEs), configuring a demodulation reference signal (DMRS) pattern by multiplexing the layers or the ports in the DMRS pattern, using an orthogonal cover code (OCC) and one or more code division multiplexing (CDM) groups, and transmitting DMRS symbols based on the configured DMRS pattern using the multiplexed layers and the ports.

    SYSTEM AND METHOD FOR RADIO FREQUENCY CARRIER AGGREGATION
    10.
    发明公开
    SYSTEM AND METHOD FOR RADIO FREQUENCY CARRIER AGGREGATION 审中-公开
    SYSTEM UND VERFAHRENFÜRFUNKFREQUENZ-TRÄGERAGGREGATION

    公开(公告)号：EP3075123A4

    公开(公告)日：2017-07-19

    申请号：EP14866483

    申请日：2014-11-25

    申请人： PLUSN LLC

    发明人： TERRY JOHN DAVID

    IPC分类号： H04L27/26 ,  H04L25/02

    CPC分类号： H04L27/2614 ,  H04J11/00 ,  H04L5/0007 ,  H04L5/001 ,  H04L5/0048 ,  H04L5/0053 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/0242 ,  H04L27/2607 ,  H04L27/2618 ,  H04L27/2621 ,  H04L27/2624 ,  H04L27/2626 ,  H04L27/2649 ,  H04L27/2655 ,  H04L27/2657 ,  H04L27/367 ,  H04L45/24 ,  H04W84/12

    摘要： A system and method for aggregation of a plurality of wireless communication signals in a common radio frequency transmitter. A multiple subchannel multiplexed (MSM) signal within a frequency band, and having a communication protocol with pilot signals estimating a channel state and efficient signal demodulation with a mobile receiver is combined with another signal. An automated digital processor at the transmitter modifies the MSM to meet at least one fitness criterion of the combined signal, selected from among alternatives that will maintain good reception of all transmitted signals within system protocols, without requiring transmitting additional side information specifying the modification. The range of alternates include modifications that disrupt the pilot signals. The fitness criterion may include minimizing the peak-to-average power ratio of the combination, and a signal modification may comprise a cyclic permutation of a portion of the time-domain representation of a signal, while maintaining compatibility with prior pilot signals.

    摘要翻译： 一种用于在公共射频发射器中聚合多个无线通信信号的系统和方法。 将频带内的多个子信道多路复用（MSM）信号与具有与导频信号估计信道状态的通信协议和利用移动接收机进行的有效信号解调的通信协议与另一个信号组合。 发射机处的自动数字处理器修改MSM以满足组合信号的至少一个适合性标准，该组合信号从在系统协议内保持所有发射信号的良好接收的备选方案中选择，而不需要传输指定该修改的附加辅助信息。 交替的范围包括破坏导频信号的修改。 适应性标准可以包括最小化组合的峰均功率比，并且信号修改可以包括信号的一部分时域表示的循环置换，同时保持与先前导频信号的兼容性。