公开(公告)号：EP1920613A4

公开(公告)日：2012-01-25

申请号：EP06802293

申请日：2006-08-24

Applicant: INTERDIGITAL TECH CORP

Inventor： PAN KYLE JUNG-LIN ,  YANG RUI ,  REZNIK ALEXANDER

IPC: H04B7/00 ,  H04W52/16 ,  H04W72/04 ,  H04W72/14

CPC classification number: H04W72/14 ,  H04W52/16

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：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：EP1606896A4

公开(公告)日：2007-02-28

申请号：EP04759634

申请日：2004-03-16

Applicant: INTERDIGITAL TECH CORP

Inventor： YANG RUI ,  GRIECO DONALD M ,  KAZAKEVICH LEONID

IPC: H04B17/40 ,  H03G3/30 ,  H04L5/14

CPC classification number: H03G3/3052 ,  H03G3/3036 ,  H03G3/3042 ,  H03G3/3047 ,  H04L5/1484 ,  H04M3/40

Abstract: In a time-division duplex (TDD) system, a reliable initialization scheme that is applicable to an automatic gain controller (AGC) at a base station is implemented in various forms depending on the availability of certain information such as signal-to-interference ratio (SIR), spreading factors and other parameters. A more accurate estimation of the initial control word of a gain-adjustable amplifier for one or more time slots is implemented. The scheme is applicable to AGC initialization for each time slot of the TDD system, but is also applicable to other systems of transmission, without limitation.

公开(公告)号：EP1649604A4

公开(公告)日：2007-01-17

申请号：EP04778184

申请日：2004-07-13

Applicant: INTERDIGITAL TECH CORP

Inventor： REZNIK ALEXANDER ,  LI BIN ,  YANG RUI ,  ZEIRA ARIELA

IPC: H04B1/00 ,  H04B1/7115 ,  H04L25/03 ,  H04Q20060101

CPC classification number: H04B1/7113 ,  H04B1/7115 ,  H04L25/03038 ,  H04L25/03987 ,  H04L2025/03592

Abstract: A receiver which suppresses inter-cluster multipath interference by processing an impulse channel response consisting of two multipath clusters, each cluster having groups of signals with multiple delays. In one embodiment, the receiver includes a single antenna and parallel-connected delay units used to align the groups of signals before being input into respective sliding window equalizers. The outputs of the equalizers are combined at chip level via a combiner which provides a single output. In another embodiment, a Cluster Multipath Interference Suppression (CMIS) circuit is incorporated into the receiver. The CMIS circuit includes a hard decision unit and a plurality of signal regeneration units to generate replicas of the multipath clusters. The replicas are subtracted from the respective outputs of the delay units and the results are input to the respective sliding window equalizers. In another embodiment, multiple antennas are used to receive and process the clusters.

公开(公告)号：EP1922704A4

公开(公告)日：2011-08-03

申请号：EP06789413

申请日：2006-08-04

Applicant: INTERDIGITAL TECH CORP

Inventor： PAN JUNG-LIN ,  YANG RUI ,  TERRY STEPHEN E

IPC: G08C25/02 ,  H04J1/16 ,  H04L1/00 ,  H04L27/06

CPC classification number: H04L1/1867 ,  H04L1/0072 ,  H04L1/1812

公开(公告)号：EP1512237A4

公开(公告)日：2005-11-30

申请号：EP03734444

申请日：2003-06-05

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  YANG RUI

IPC: H03M1/18 ,  H03G3/00 ,  H03G3/20 ,  H03G3/30 ,  H03G7/06 ,  H03M1/12 ,  H04B17/40 ,  H04B17/02

CPC classification number: H03G7/06 ,  H03G3/001 ,  H03M1/1235

Abstract: An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit. After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) is used to expand the digital signal back to the original linear scale. The word size of the output of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied.

Abstract translation: 模拟/数字增益控制设备避免了一些与闭环AGC电路性质相关的要求，并且能够毫不费力地满足其余要求，使用模数转换方法，通过压缩该模数转换方法来增加有效ADC位数 基带输入模拟信号采用对数电路。 在将压缩的模拟信号转换为数字信号之后，使用数字反对数处理或查找表（LUT）将数字信号扩展回原始线性比例。 由于反对数函数的性质，反对数进程输出的字大小大于输入字大小。 为了减小数字信号的字长，可以应用开环标准化技术。

公开(公告)号：EP1908173A4

公开(公告)日：2012-11-14

申请号：EP06787487

申请日：2006-07-17

Applicant: INTERDIGITAL TECH CORP

Inventor： BULTAN AYKUT ,  PAN KYLE JUNG-LIN ,  YANG RUI ,  KEARNEY KENNETH P

IPC: H04B1/00 ,  H03J7/04 ,  H03L7/00

CPC classification number: H03J7/04

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.