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    • 27. 发明申请
    • METHOD AND APPARATUS FOR MULTIPLE-INPUT MULTIPLE-OUTPUT OPERATION
    • 用于多输入多输出操作的方法和设备
    • WO2013025486A2
    • 2013-02-21
    • PCT/US2012/050301
    • 2012-08-10
    • INTERDIGITAL PATENT HOLDINGS, INC.NAZAR, Shahrokh NayebLEE, Moon-ilOLESEN, Robert, L.RAGHAVAN, ManasaIYER, Lakshmi, R.PELLETIER, Benoit
    • NAZAR, Shahrokh NayebLEE, Moon-ilOLESEN, Robert, L.RAGHAVAN, ManasaIYER, Lakshmi, R.PELLETIER, Benoit
    • H04B7/04
    • H04B7/0452H04W72/04
    • A wireless transmit/receive unit (WTRU) receives a downlink transmission from an eNodeB including a plurality of spatial layers transmitted to a plurality of WTRUs paired for multi-user MIMO. The WTRU decodes the downlink transmission based on a corresponding WTRU-specific reference signal. WTRU-specific reference signals are multiplexed using a frequency and code division multiplexing. WTRU-specific reference signals for different sub-group of antenna ports are multiplexed onto different subcarriers in a frequency domain and the WTRU-specific reference signals of the same sub-group of antennas ports are multiplied by an orthogonal cover code. The resource elements used for the WTRU-specific reference signals on antenna ports in one sub-group may be muted on antenna ports in another sub-group. A WTRU may transmit the uplink demodulation reference signal without precoding. The number of resource blocks allocated for the demodulation reference signal may be greater than the number of resource blocks allocated for the payload.
    • 无线发射/接收单元(WTRU)从包括多个空间层的eNodeB接收下行链路传输,该多个空间层被发送到为多用户MIMO配对的多个WTRU。 WTRU基于对应的WTRU特定的参考信号来解码下行链路传输。 WTRU特定参考信号使用频率和码分复用进行复用。 用于不同子组天线端口的WTRU特定参考信号被复用到频域中的不同子载波上,并且相同子天线端口组的WTRU特定参考信号被正交覆盖码相乘。 用于一个子组中的天线端口上的WTRU特定的参考信号的资源元素可以在另一个子组中的天线端口上被静音。 WTRU可以在没有预编码的情况下发送上行链路解调参考信号。 分配给解调参考信号的资源块的数量可以大于分配给有效载荷的资源块的数量。
    • 28. 发明申请
    • METHODS FOR PROVIDING PRECODING AND FEEDBACK AND BASE STATION
    • 提供预测和反馈和基站的方法
    • WO2012125931A1
    • 2012-09-20
    • PCT/US2012/029453
    • 2012-03-16
    • INTERDIGITAL PATENT HOLDINGS, INC.LI, Yingxue, K.SHENG, HongsanZHANG, GuodongOLESEN, Robert, L.LU, EnochLU, I-tai
    • LI, Yingxue, K.SHENG, HongsanZHANG, GuodongOLESEN, Robert, L.LU, EnochLU, I-tai
    • H04B7/06
    • H04B7/0626H04B7/0617H04B7/065
    • Beamforming, precoding, and feedback systems and methods are provided. For example, user equipment (UE) estimates an effective channel using a predetermined channel independent matrix or beamforming. Such an effective channel estimate along with other feedback information including a channel quality indicator (CQI) and a precoding matrix indicator (PMI) is fed back to an eNB. The eNB may precode data and may provide channel estimation at the eNB using a double codebook or double precoder. For example, the eNB may precode data based on the feedback information (e.g. using a channel dependent precoder) and the eNB may precode the data based on the channel independent matrix (e.g. using a channel independent precoder) that may be channel independent and/or preset (e.g. known to both eNB and UE), and may change each TTI. Such precoding along with scaling factors approximated from the PMI or CQI feedback may be used to enable the eNB to estimate a channel based covariance matrix and design the channel dependent precoder.
    • 提供波束形成,预编码和反馈系统和方法。 例如,用户设备(UE)使用预定的信道无关矩阵或波束形成来估计有效信道。 将这样的有效信道估计与包括信道质量指示符(CQI)和预编码矩阵指示符(PMI)的其他反馈信息一起反馈给eNB。 eNB可以预编码数据,并且可以使用双码本或双重预编码器在eNB处提供信道估计。 例如,eNB可以基于反馈信息(例如,使用信道相关预编码器)对数据进行预编码,并且eNB可以基于与信道无关的矩阵(例如,使用信道独立的预编码器)对数据进行预编码,该矩阵可以是信道独立的和/或 预置(例如,已知的eNB和UE),并且可以改变每个TTI。 这样的预编码以及从PMI或CQI反馈近似的缩放因子可以用于使得eNB能够估计基于信道的协方差矩阵并设计信道相关预编码器。