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    • 4. 发明申请
    • METHOD AND APPARATUS FOR CODEBOOK EXCHANGE IN A MULTIPLE ACCESS WIRELESS COMMUNICATION SYSTEM
    • 多种无线通信系统中的代码交换方法与装置
    • WO2008052191A3
    • 2008-10-09
    • PCT/US2007082734
    • 2007-10-26
    • QUALCOMM INCPRAKASH RAJATSARKAR SANDIP
    • PRAKASH RAJATSARKAR SANDIP
    • H04L25/03H04B7/06
    • H04L25/03343H04B7/0417H04B7/063H04B7/0634H04B7/0639H04L2025/03426
    • Methods and apparatus are disclosed for generating and exchanging codebooks in a multiple access wireless communication system, such as Space Division Multiple Access (SDMA). The codebooks include a plurality of preferred precoding matrices. The codebooks are generated at an access network. Generating a codebook may further include generating a codebook identifier assigned by the access network. The codebooks are communicated to access terminals. Communicating the codebooks may further include querying the access terminals to determine an identity of codebooks currently stored at each access terminal, receiving a codebook status response from each of the access terminals indicating the identity of codebooks stored at each of the access terminals. The codebooks may also be assigned to access terminals for a predetermined sector in the active set of communication links. Generating a codebook may further include generating a codebook that includes identification of clusters. The clusters identify a set of the precoding matrices and, as such, a set of beams in the cluster. Thus, the clusters may identify a starting beam index and an ending beam index. The codebook may further include an overlap cluster map that indicates clusters authorized to potentially overlap.
    • 公开了用于在诸如空分多址(SDMA)的多址无线通信系统中生成和交换码本的方法和装置。 码本包括多个优选的预编码矩阵。 码本在接入网络中生成。 生成码本还可以包括生成由接入网分配的码本标识符。 码本被传送到接入终端。 沟通码本还可以包括查询接入终端确定当前存储在每个接入终端的码本的身份,从每个接入终端接收指示存储在每个接入终端的码本的身份的码本状态响应。 码本也可以被分配给有源通信链路集中的预定扇区的接入终端。 生成码本还可以包括生成包括识别簇的码本。 簇识别一组预编码矩阵,并且同样地,聚类中的一组波束。 因此,簇可以识别起始波束索引和结束波束索引。 码本还可以包括指示被授权潜在重叠的簇的重叠簇映射。
    • 5. 发明申请
    • TRANSMISSION AND RECEPTION OF DEDICATED REFERENCE SIGNALS
    • 传输和接收专用参考信号
    • WO2009120791A3
    • 2009-11-19
    • PCT/US2009038268
    • 2009-03-25
    • QUALCOMM INCLUO TAOMONTOJO JUANGAAL PETERSARKAR SANDIP
    • LUO TAOMONTOJO JUANGAAL PETERSARKAR SANDIP
    • H04W16/02
    • H04W16/02H04J11/0069H04L5/0007H04L5/0048H04L5/0058H04W48/12
    • Providing a coding scheme for wireless communication downlink reference signals is described herein. By way of example, a dedicated reference signal is mapped (108) (204) to resources of a wireless channel as a function of an identifier (ID) (112) (210) of a cell in which the reference signal is transmitted. The function can be similar to mapping functions employed for common reference signals, or can be distinct from such functions. As one example of the latter, a dedicated reference signal mapping function can be shifted in time or frequency with respect to the common reference signal mapping function. By employing a mapping function based on cell ID, noise caused by concurrent transmission of reference signals can be mitigated in a manner readily determined by terminals in a wireless network.
    • 本文描述了提供无线通信下行链路参考信号的编码方案。 作为示例,作为发送参考信号的小区的标识符(ID)(112)(210)的函数,专用参考信号被映射(108)(204)到无线信道的资源。 该功能可以类似于用于公共参考信号的映射函数,或者可以与这些功能不同。 作为后者的一个例子,相对于公共参考信号映射函数,专用参考信号映射函数可以在时间或频率上移位。 通过采用基于小区ID的映射功能,可以以无线网络中的终端容易确定的方式来减轻由参考信号的并发传输引起的噪声。
    • 10. 发明申请
    • CALIBRATION AND BEAMFORMING IN A WIRELESS COMMUNICATION SYSTEM
    • 无线通信系统中的校准和射束
    • WO2009046318A3
    • 2009-08-13
    • PCT/US2008078779
    • 2008-10-03
    • QUALCOMM INCSARKAR SANDIP
    • SARKAR SANDIP
    • H04B7/06H04B17/00
    • H04B7/0617H04B7/0628H04B17/21
    • Techniques for performing calibration and beamforming in a wireless communication system are described. In an aspect, a Node B may periodically perform calibration in each calibration interval with a set of UEs to obtain a calibration vector for the Node B. The Node B may apply the calibration vector to account for mismatches in the responses of the transmit and receive chains at the Node B. In another aspect, the Node B may perform beamforming to a UE by taking into account gain imbalance for multiple antennas at the UE. The Node B may determine a precoding matrix for beamforming by taking into account gain imbalance due to (i) different automatic gain control (AGC) gains for receive chains at the UE, (ii) different power amplifier (PA) gains for transmit chains at the UE, and/or (iii) different antenna gains for multiple antennas at the UE.
    • 描述了在无线通信系统中执行校准和波束成形的技术。 在一方面,节点B可以在每个校准间隔中周期性地执行与一组UE的校准,以获得用于节点B的校准向量。节点B可以应用校准向量来解决发送和接收的响应中的不匹配 在另一方面,节点B可以通过考虑UE处的多个天线的增益不平衡来向UE执行波束赋形。 节点B可以通过考虑由于(i)UE处的接收链的不同的自动增益控制(AGC)增益而考虑增益不平衡来确定用于波束成形的预编码矩阵,(ii)用于发射链的不同功率放大器(PA)增益 UE,和/或(iii)UE处的多个天线的不同天线增益。