公开(公告)号：EP1815601A4

公开(公告)日：2008-01-23

申请号：EP05813289

申请日：2005-10-19

申请人： INTERDIGITAL TECH CORP

发明人： PIETRASKI PHILIP J ,  YANG RUI ,  BELURI MIHAELA ,  DEMIR ALPASLAN

IPC分类号： H04B1/707 ,  H04B1/00 ,  H04L27/06

CPC分类号： H04B1/7097 ,  H04B1/712 ,  H04L25/03248

摘要： A method and apparatus for estimating and correcting baseband frequency error in a receiver. In one embodiment, an equalizer performs equalization on a sample data stream and generates filter tap values based on the equalization. An estimated frequency error signal is generated based on at least one of the filter tap values. A rotating phasor is generated based on the estimated frequency error signal. The rotating phasor signal is multiplied with the sample data stream to correct the frequency of the sample data stream. In another embodiment, a channel estimator performs channel estimation and generates Rake receiver finger weights based on at least one of the finger weights. An estimated frequency error signal is generated based on at least one of the finger weights.

公开(公告)号：EP1810400A4

公开(公告)日：2008-01-16

申请号：EP05810082

申请日：2005-10-18

申请人： INTERDIGITAL TECH CORP

发明人： ZEIRA ARIELA ,  PIETRASKI PHILIP J ,  PAN KYLE JUNG-LIN ,  BELURI MIHAELA ,  YANG RUI

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/03044 ,  H04B1/7097 ,  H04B7/0854 ,  H04L2025/03375 ,  H04L2025/03426 ,  H04L2025/03477 ,  H04L2025/03509 ,  H04L2025/03617

摘要： A receiver which includes at least one equalizer filter and a tap coefficients generator for implementing receive diversity. The equalizer filter processes a signal derived from signals received by a plurality of antennas. In one embodiment, sample data streams from the antennas are merged into one sample data stream. The merged sample data stream is processed by a single extended equalizer filter, whereby filter coefficients are adjusted in accordance with a joint error signal. A filter coefficient correction term used by the equalizer filter is generated by the tap coefficients generator using a normalized least mean square (NLMS) algorithm. In another embodiment, a plurality of equalizer filters are utilized, whereby each equalizer receives a sample data stream from a specific one of the antennas. In yet another embodiment, the sample data streams are combined after being processed by a plurality of matched filters based on respective estimated channel impulse responses.

公开(公告)号：EP1810402A4

公开(公告)日：2011-09-28

申请号：EP05814908

申请日：2005-10-20

申请人： INTERDIGITAL TECH CORP

发明人： PIETRASKI PHILIP J ,  BELURI MIHAELA ,  DEMIR ALPASLAN

IPC分类号： H04L25/03

CPC分类号： H04L25/03019 ,  H04B2201/70701 ,  H04L2025/03687

公开(公告)号：EP1807932A4

公开(公告)日：2009-09-02

申请号：EP05816112

申请日：2005-11-02

申请人： INTERDIGITAL TECH CORP

发明人： PIETRASKI PHILIP J ,  BELURI MIHAELA ,  DEMIR ALPASLAN ,  PAN JUNG-LIN ,  STERNBERG GREGORY S ,  YANG RUI ,  LI BIN

IPC分类号： H04L25/03

CPC分类号： H04L25/03038 ,  H04B1/7097 ,  H04L27/0014 ,  H04L2025/03509 ,  H04L2025/03547 ,  H04L2025/03585 ,  H04L2025/03611 ,  H04L2025/03617 ,  H04L2025/03687 ,  H04L2027/003 ,  H04L2027/0038 ,  H04L2027/0065

摘要： An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch and a pilot amplitude reference unit used to minimize the dynamic range of the equalizer filter. A dynamic mask vector is used to mask active taps generated by the equalizer tap update unit when an unmasked signal output by the equalizer filter is selected by the switch to generate an error signal fed to the equalizer tap update unit. A fixed mask vector is used to mask active taps generated by the equalizer tap update unit when a masked signal output by the equalizer filter is used to generate the error signal.

公开(公告)号：EP1810399A4

公开(公告)日：2007-12-05

申请号：EP05809794

申请日：2005-10-18

申请人： INTERDIGITAL TECH CORP

发明人： PIETRASKI PHILIP J ,  BELURI MIHAELA

IPC分类号： H03H7/30

CPC分类号： H04L25/03038 ,  H04B1/7097 ,  H04L2025/03375 ,  H04L2025/03477 ,  H04L2025/03617

摘要： A method and apparatus generating an error signal (156) and an update vector signal (124) used to generate filter tap coefficients (128) for an equalizer filter (130) residing in an equalizer (100). The equalizer filter (130) outputs an equalized signal (132) in response to receiving a sample data stream (102). The error signal (156) is generated by down-sampling (140) the equalized signal (132), subtracting (144) the equalized signal (132) from a reference signal (146) and filtering (150) and down-sampling (154) the resulting signal. Simultaneously, the update vector signal (124) is generated by converting scalar samples of the sample data stream (102) to a data vector signal (106) and descrambling 116, filtering (118), and down-sampling (122) the data vector signal (106). A tap coefficients generator (126) is used to generate the filter tap coefficients (128) for updating the equalizer filter (130) based on the error signal (156) and the update vector signal (124).

摘要翻译： 一种产生误差信号的方法和装置以及用于产生驻留在均衡器中的均衡器滤波器的滤波器抽头系数的更新向量信号。 均衡器滤波器响应于接收样本数据流输出均衡的信号。 通过对均衡信号进行下采样，从参考信号中减去均衡信号，并对结果信号进行滤波和下采样，产生误差信号。 同时，通过将样本数据流的标量样本转换为数据矢量信号并对数据矢量信号进行解扰，滤波和下采样来生成更新矢量信号。 抽头系数发生器用于基于误差信号和更新向量信号产生用于更新均衡器滤波器的滤波器抽头系数。