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    • 21. 发明申请
    • METHOD AND APPARATUS FOR FREQUENCY CONTROL IN WIRELESS COMMUNICATIONS
    • 无线通信中频率控制的方法与装置
    • WO2010069843A1
    • 2010-06-24
    • PCT/EP2009/066752
    • 2009-12-09
    • Telefonaktiebolaget L M Ericsson (publ)REIAL, AndresBERNHARDSSON, BoWANG, Xiaohui
    • REIAL, AndresBERNHARDSSON, BoWANG, Xiaohui
    • H03J7/02
    • H03J7/02
    • The automatic frequency correction value applied by a receiver is altered to minimize long-term drift of a path delay profile. In one embodiment, the phase or timing error resulting from constant frequency corrections is accumulated, and an estimated frequency correction value is selectively quantized into an actual frequency correction value in response to the accumulated phase/timing error. The quantized value above or below the estimate is selected to minimize the accumulated phase/timing error that gives rise to path delay profile drift. In another embodiment, a timing circuit measures the instantaneous path delay profile drift incurred with each frequency correction, and integrates the instantaneous drift measurements over time to yield a path delay profile drift. The drift (or its rate of change) is then used to adjust a frequency correction value so as to minimize the drift.
    • 由接收机施加的自动频率校正值被改变以最小化路径延迟分布的长期漂移。 在一个实施例中,累积了由恒定频率校正引起的相位或定时误差,并且响应于累积的相位/定时误差,将估计频率校正值选择性地量化为实际频率校正值。 选择高于或低于估计的量化值以最小化引起路径延迟分布漂移的累积相位/定时误差。 在另一个实施例中,定时电路测量每个频率校正引起的瞬时路径延迟分布漂移,并且随着时间的推移积分瞬时漂移测量以产生路径延迟分布漂移。 然后使用漂移(或其变化率)来调整频率校正值,以便使漂移最小化。
    • 30. 发明申请
    • METHOD AND APPARATUS FOR COMMUNICATION CHANNEL ESTIMATION
    • 通信信道估计的方法和装置
    • WO2007048585A1
    • 2007-05-03
    • PCT/EP2006/010264
    • 2006-10-25
    • TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)WILHELMSSON, LeifBERNHARDSSON, BoLARSSON, Per-Ola
    • WILHELMSSON, LeifBERNHARDSSON, BoLARSSON, Per-Ola
    • H04L25/02
    • H04L25/023H04L25/0204H04L25/022H04L27/2608H04L27/2647
    • A method and apparatus for predicting channel estimates for non-received signal frequencies provides knowledge of propagation channel characteristics for non-received frequencies. One embodiment predicts uplink (or downlink) channel estimates based on measured downlink (or uplink) channel estimates, which is advantageous in systems having different uplink and downlink frequencies. Another embodiment predicts channel responses for non-received OFDM sub carrier frequencies based on measuring channel responses for received OFDM sub carrier frequencies. Such processing may comprise, for example, measuring channel responses for received OFDM pilot sub carriers, predicting channel responses at frequency intervals corresponding to pilot sub carrier spacing, and interpolating between those values to predict channel responses at data sub carrier frequencies. The prediction of the channel frequency responses for non-received signal frequencies is done using an autoregression model.
    • 用于预测未接收信号频率的信道估计的方法和装置提供了对于未接收频率的传播信道特性的知识。 一个实施例基于测量的下行链路(或上行链路)信道估计来预测上行链路(或下行链路)信道估计,这在具有不同的上行链路和下行链路频率的系统中是有利的。 另一个实施例基于对接收的OFDM子载波频率的测量信道响应来预测未接收的OFDM子载波频率的信道响应。 这样的处理可以包括例如测量接收的OFDM导频子载波的信道响应,以对应于导频子载波间隔的频率间隔预测信道响应,以及在这些值之间内插以预测数据子载波频率处的信道响应。 非接收信号频率的信道频率响应的预测使用自回归模型进行。