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    DATA-AIDED CHANNEL ESTIMATION
    2.
    发明公开
    DATA-AIDED CHANNEL ESTIMATION 有权
    基于数据的信道估计

    公开(公告)号：EP2537305A2

    公开(公告)日：2012-12-26

    申请号：EP11702016.4

    申请日：2011-01-31

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： ROSENQVIST, Anders ,  REIAL, Andres ,  CAIRNS, Douglas

    IPC分类号： H04L25/02

    CPC分类号： H04L25/0226 ,  H04L25/0238

    摘要： A signal-to-interference estimate is generated using unknown data symbols in place of or in addition to pilot symbols. Data received over a data channel (traffic channel or control channel) are collected. The data symbols are then used to compute an observation metric based on deviations of the data symbols from a predetermined set of possible data symbols, wherein one of the data symbols and symbol constellation is normalized. A data channel signal-to-interference ratio is then computed based on the observation metric.

    REDUCED-COMPLEXITY PARAMETRIC COVARIANCE ESTIMATION FOR PRECODED MIMO TRANSMISSIONS
    4.
    发明公开
    REDUCED-COMPLEXITY PARAMETRIC COVARIANCE ESTIMATION FOR PRECODED MIMO TRANSMISSIONS 有权
    参协方差降低了复杂性预编码后的MIMO传输

    公开(公告)号：EP2253071A1

    公开(公告)日：2010-11-24

    申请号：EP09714533.8

    申请日：2009-02-11

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： GRANT, Stephen ,  CAIRNS, Douglas

    IPC分类号： H04B1/707

    CPC分类号： H04L25/03898 ,  H04B1/712 ,  H04B7/0413 ,  H04B7/0619 ,  H04B17/21 ,  H04B17/336 ,  H04B2201/70707 ,  H04B2201/709727

    摘要： A model-based technique for estimating impairment covariance associated with a MIMO signal is disclosed. In an exemplary method, an impairment model is constructed for a received composite information signal comprising at least a first data stream transmitted from first and second antennas according to a first antenna weighting vector. The impairment model includes first and second model terms corresponding to the first and second antennas, respectively, but does not include a cross-antenna interference term. In another embodiment, an impairment model for a received MIMO signal is constructed by computing an impairment model term for each antenna and an additional term to account for precoding interference in a single-stream MIMO transmission scenario. The impairment terms are grouped so that only two associated scaling terms are unknown; values for the scaling terms are estimated by fitting the model to measured impairment covariance values.

    A METHOD AND APPARATUS FOR COMPENSATING FOR PROCESSING TIMING MISALIGNMENT IN A COMMUNICATION RECEIVER
    7.
    发明公开
    A METHOD AND APPARATUS FOR COMPENSATING FOR PROCESSING TIMING MISALIGNMENT IN A COMMUNICATION RECEIVER 有权
    方法和装置处理时钟错位在通信接收器中补偿

    公开(公告)号：EP2272175A1

    公开(公告)日：2011-01-12

    申请号：EP09737981.2

    申请日：2009-04-08

    申请人： Telefonaktiebolaget L M Ericsson (publ)

    发明人： REIAL, Andres ,  CAIRNS, Douglas ,  GRANT, Stephen ,  RIBACK, Mathias

    IPC分类号： H04B1/707

    CPC分类号： H04B1/712 ,  H04B1/7105 ,  H04B1/7117 ,  H04B2201/709727

    摘要： According to the teachings presented herein, a wireless communication apparatus compensates for timing misalignment in its received signal processing. In at least one embodiment, the apparatus estimates a set of path delays for a received signal and sets processing delays on the estimated path delays. The apparatus jointly hypothesizes combinations of fractional timing offsets for two or more paths, and computes a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis. As non-limiting examples, the decision metric may be a signal quality metric, or a distance metric (such as between a measured net channel response and an effective net channel response reconstructed as a function of the combination of fractional timing offsets included in the joint hypothesis). The apparatus evaluates the decision metrics to identify a best estimate of timing misalignment, and correspondingly compensates coherent processing of the received signal.