公开(公告)号：EP1820282A4

公开(公告)日：2008-04-02

申请号：EP05852407

申请日：2005-11-30

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J

IPC: H04L25/02

CPC classification number: H04L25/0228 ,  H04L25/0212

Abstract: A channel estimation apparatus and method is provided for a wireless communication signal received from at least one relatively mobile wireless transmit/receive unit (WTRU). Predetermined filter coefficients having unique index values are stored in a memory device. An index generator matches estimation values of the mobile unit speed and SNR to a particular filter coefficient, and selects a corresponding index value, whereby the memory performs a look up function according to the index value and outputs a filter coefficient vector. The channel estimation of the wireless communication signal is taken from the output of the filter. Alternatively, a set of parallel filters which run continuously are used to produce several channel estimates, from which the final estimate is selected based on the associated lowest mean square error or highest SNR.

公开(公告)号：EP1810400A4

公开(公告)日：2008-01-16

申请号：EP05810082

申请日：2005-10-18

Applicant: INTERDIGITAL TECH CORP

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

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

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

Abstract: 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：EP1685720A4

公开(公告)日：2007-12-05

申请号：EP04811400

申请日：2004-11-18

Applicant: INTERDIGITAL TECH CORP

Inventor： RUDOLF MARIAN ,  DICK STEPHEN G ,  PIETRASKI PHILIP J

IPC: H04W72/04 ,  H04B20060101 ,  H04B7/00 ,  H04B7/26 ,  H04L29/00 ,  H04W72/14

CPC classification number: H04W72/0453 ,  H04L1/0046 ,  H04L1/0061 ,  H04L1/0072 ,  H04L5/0053 ,  H04L5/0091 ,  H04L5/14 ,  H04W48/16 ,  H04W72/0406 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/14

Abstract: A method and wireless communication system for providing channel assignment information used to support an uplink (UL) channel and a downlink (DL) channel. The system includes at least one Node-B and at least one wireless transmit/receive unit (WTRU). The WTRU communicates with the Node-B via a common control channel, the UL channel and the DL channel. The WTRU receives a message from the Node-B via the common control channel. The message includes an indication of whether the message is intended for assigning radio resources to the UL channel or the DL channel. The WTRU determines whether the message is intended for the WTRU and, if so, the WTRU determines whether the message is for assigning radio resources to the UL channel or the DL channel. The WTRU takes an appropriate action based on whether the message is for assigning radio resources to the UL channel or the DL channel.

公开(公告)号：EP1810402A4

公开(公告)日：2011-09-28

申请号：EP05814908

申请日：2005-10-20

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  BELURI MIHAELA ,  DEMIR ALPASLAN

IPC: H04L25/03

CPC classification number: 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

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：EP1568141A4

公开(公告)日：2008-08-27

申请号：EP03781981

申请日：2003-11-17

Applicant: INTERDIGITAL TECH CORP

Inventor： STERNBERG GREGORY S ,  YANG RUI ,  PIETRASKI PHILIP J ,  OLESEN ROBERT LIND

IPC: H03M13/45 ,  H03M13/35 ,  H04L1/00 ,  H04L1/18 ,  H04L1/20 ,  H04L25/06

CPC classification number: H04L25/067 ,  H03M13/35 ,  H04L1/0045 ,  H04L1/0071 ,  H04L1/1812 ,  H04L1/20 ,  H04L25/0222

Abstract: A system, components and methods provide FEC decoding in a wireless communication system in which signal to noise ratio estimation is used for scaling (18) information captured by a demodulator (14) in processing received wireless communication signals (12). A preferred wireless transmit unit (WRTU) has a channel rate estimation device (23) configured to process the received communication signals for the particular communication channel and to produce channel change rate estimates. A signal to noise ratio (SNR) estimation device (16) of the WRTU is configured to produce SNR estimates based on observation windows of a calculated number of samples of the received signal where the number of samples used for each observation window is calculated (25) as a function of the channel change rate estimates produced by the channel rate estimation device (23).

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：EP1557057A4

公开(公告)日：2006-12-13

申请号：EP03781633

申请日：2003-10-31

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J

IPC: H04L1/00 ,  H04B7/005 ,  H04L1/20

CPC classification number: H04W52/262 ,  H04B17/20 ,  H04B17/24 ,  H04B17/26 ,  H04B17/373 ,  H04B17/382 ,  H04L1/0001 ,  H04L1/0019 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/20 ,  H04W52/143 ,  H04W52/22 ,  H04W52/223 ,  H04W52/226 ,  H04W52/228 ,  H04W52/241

Abstract: A method of improved performance through channel quality prediction for communications systems employing link adaption techniques includes a receiver which makes selective measurements on downlink transmissions, and then stores one or more of the measurements or a channel quality indicator derived therefrom. The receiver then retrieves one or more of the past measurements (or the past channel quality estimates themselves), and combines it with current measurements (or the current channel quality estimate), to predict what the channel quality will be at some future time and derive a predictive channel quality indicator (CQI). This predictive CQI, derived from both current channel measurements and at least one past channel measurement, is then sent to the transmitter for use in updating transmission parameters.

公开(公告)号：EP1719263A4

公开(公告)日：2013-01-23

申请号：EP05722616

申请日：2005-02-02

Applicant: INTERDIGITAL TECH CORP

Inventor： STERNBERG GREGORY S ,  TSAI YINGMING ,  PIETRASKI PHILIP J

IPC: H03M13/41 ,  H04B7/00 ,  H04B17/40 ,  H04L1/00 ,  H04L1/20

CPC classification number: H04L1/20 ,  H03M13/3738 ,  H03M13/41 ,  H03M13/653 ,  H04L1/0054 ,  H04L1/0072

公开(公告)号：EP1815601A4

公开(公告)日：2008-01-23

申请号：EP05813289

申请日：2005-10-19

Applicant: INTERDIGITAL TECH CORP

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

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

CPC classification number: H04B1/7097 ,  H04B1/712 ,  H04L25/03248

Abstract: 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.