公开(公告)号：EP1807932A4

公开(公告)日：2009-09-02

申请号：EP05816112

申请日：2005-11-02

Applicant: INTERDIGITAL TECH CORP

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

IPC: H04L25/03

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

Abstract: 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

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  BELURI MIHAELA

IPC: H03H7/30

CPC classification number: H04L25/03038 ,  H04B1/7097 ,  H04L2025/03375 ,  H04L2025/03477 ,  H04L2025/03617

Abstract: 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).

Abstract translation: 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。

公开(公告)号：MX2007011269A

公开(公告)日：2007-11-08

申请号：MX2007011269

申请日：2006-03-06

Applicant: INTERDIGITAL TECH CORP

Inventor： YANG RUI ,  PIETRASKI PHILLIP J ,  BELURI MIHAELA ,  CHINCHOLI AMITH VIKRAM ,  KEARNEY KENNETH P

IPC: H04B1/707

Abstract: Se describe un metodo y aparato para compensar el ruido de fase de simbolos dispersados con un codigo de dispersion largo. Para compensar el ruido de fase, se genera un calculo de error de fase a partir de los simbolos recuperados con un codigo de dispersion corto. Se aplica un fasor de correccion de fase a los datos de velocidad de chip antes de la recuperacion de los datos con un codigo de dispersion largo. Se puede calcular una relacion de senal a interferencia (SIR) en un canal de piloto comun (CPICH) por dispersion de los datos con un codigo de dispersion de origen en un arbol de codigo de factor de dispersion variable ortogonal (OVSF) al combinar simbolos. De manera alternativa, se puede utilizar una magnitud de los simbolos en el calculo de SIR. El SIR de un canal que utiliza un codigo de dispersion corto y un SIR de un canal utilizando un codigo de dispersion largo se miden. El SIR del canal con codigo de dispersion largo se puede compensar de acuerdo con una diferencia entre la degradacion de los SIR.

公开(公告)号：NO20072745A

公开(公告)日：2007-08-02

申请号：NO20072745

申请日：2007-05-30

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  DEMIR ALPASLAN ,  BELURI MIHAELA

IPC: H03H7/30

CPC classification number: H04L25/03019 ,  H04B2201/70701 ,  H04L2025/03687

公开(公告)号：CA2601362A1

公开(公告)日：2006-09-28

申请号：CA2601362

申请日：2006-03-06

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  YANG RUI ,  BELURI MIHAELA ,  CHINCHOLI AMITH VIKRAM ,  KEARNEY KENNETH P

IPC: H04B1/707

Abstract: A method and apparatus for compensating for phase noise of symbols spread with a long spreading code are disclosed. To compensate for the phase noise, a phase error estimate is generated from despread symbols with a short spreading code. A phase correcting phasor is applied to chip rate data before despreading the data with a long spreading code. A signal-to-interference ratio (SIR) on a common pilot channel (CPICH) may be calculated by spreading the data with a parent spreading code in an orthogonal variable spreading factor (OVSF) code tree and by combining symbols. Alternatively, a magnitude of the symbols may be used in estimating the SIR. The SIR of a channel using a short spreading code and an SIR of a channel using a long spreading code are measured. The SIR of the channel with the long spreading code may be compensated in accordance with a difference between degradation of the SIRs.

公开(公告)号：NO20075337A

公开(公告)日：2007-12-14

申请号：NO20075337

申请日：2007-10-18

Applicant: INTERDIGITAL TECH CORP

Inventor： YANG RUI ,  KEARNEY KENNETH P ,  PIETRASKI PHILIP J ,  BELURI MIHAELA ,  CHINCHOLI AMITH VIKRAM

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/216

CPC classification number: H04B1/707 ,  H04B2201/70701

公开(公告)号：CA2588262A1

公开(公告)日：2006-05-18

申请号：CA2588262

申请日：2005-11-02

Applicant: INTERDIGITAL TECH CORP

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

IPC: H03H7/30 ,  G06F17/10 ,  H03K5/159 ,  H04B1/10 ,  H04B3/14

Abstract: 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：CA2586992A1

公开(公告)日：2006-05-18

申请号：CA2586992

申请日：2005-10-19

Applicant: INTERDIGITAL TECH CORP

Inventor： DEMIR ALPASLAN ,  PIETRASKI PHILIP J ,  YANG RUI ,  BELURI MIHAELA

IPC: H03H7/40

Abstract: An apparatus for estimating and correcting baseband frequency error in a receiver is disclosed. 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. Alternatively, a channel estimator performs channel estimation and generates Rake receive 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：NO20075337L

公开(公告)日：2007-12-14

申请号：NO20075337

申请日：2007-10-18

Applicant: INTERDIGITAL TECH CORP

Inventor： YANG RUI ,  KEARNEY KENNETH P ,  PIETRASKI PHILIP J ,  BELURI MIHAELA ,  CHINCHOLI AMITH VIKRAM

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/216

Abstract: A method and apparatus for compensating for phase noise of symbols spread with a long spreading code are disclosed. To compensate for the phase noise, a phase error estimate is generated from despread symbols with a short spreading code. A phase correcting phasor is applied to chip rate data before despreading the data with a long spreading code. A signal-to-interference ratio (SIR) on a common pilot channel (CPICH) may be calculated by spreading the data with a parent spreading code in an orthogonal variable spreading factor (OVSF) code tree and by combining symbols. Alternatively, a magnitude of the symbols may be used in estimating the SIR. The SIR of a channel using a short spreading code and an SIR of a channel using a long spreading code are measured. The SIR of the channel with the long spreading code may be compensated in accordance with a difference between degradation of the SIRs.

公开(公告)号：NO20072860L

公开(公告)日：2007-08-03

申请号：NO20072860

申请日：2007-06-05

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  BELURI MIHAELA

IPC: H03H7/30

Abstract: A method and apparatus generating an error signal and an update vector signal used to generate filter tap coefficients for an equalizer filter residing in an equalizer. The equalizer filter outputs an equalized signal in response to receiving a sample data stream. The error signal is generated by down-sampling the equalized signal, subtracting the equalized signal from a reference signal, and filtering and down-sampling the resulting signal. Simultaneously, the update vector signal is generated by converting scalar samples of the sample data stream to a data vector signal and descrambling, filtering, and down-sampling the data vector signal. A tap coefficients generator is used to generate the filter tap coefficients for updating the equalizer filter based on the error signal and the update vector signal.