公开(公告)号：NO20072807L

公开(公告)日：2007-07-26

申请号：NO20072807

申请日：2007-06-01

Applicant: INTERDIGITAL TECH CORP

Inventor： CASTOR DOUGLAS R ,  PIETRASKI PHILIP J ,  STERNBERG GREGORIO S

IPC: H04L1/20 ,  H04W24/00 ,  H04W28/04 ,  H04W28/18 ,  H04W48/08

Abstract: A method and apparatus for adaptively biasing a channel quality indicator (CQI) used for setting a configuration of communication between a transmitter and a receiver in a wireless communication system. The receiver sends a CQI and positive acknowledgement (ACK)/negative acknowledgement (NACK) messages to the transmitter. The ACK/NACK messages indicate the absence or presence of error, respectively, in a transmitted data packet. The CQI is derived from the signal-to-interference ratio (SIR) and the ACK/NACK messages. The transmitter calculates the block error rate (BLER) of the transmitted data packets based upon the ACK/NACK messages sent from the receiver. The transmitter compares the BLER of the transmitted data packets to a target BLER and biases the CQI based on the comparison in order to achieve the target BLER.

公开(公告)号：NO20072859A

公开(公告)日：2007-06-05

申请号：NO20072859

申请日：2007-06-05

Applicant: INTERDIGITAL TECH CORP

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

IPC: H04B7/005

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

公开(公告)号：MX2007001707A

公开(公告)日：2007-04-12

申请号：MX2007001707

申请日：2005-07-29

Applicant: INTERDIGITAL TECH CORP

Inventor： OZLUTURK FATIH ,  PIETRASKI PHILIP J ,  BULTAN AYKUT

IPC: H04J99/00 ,  H04W52/42

Abstract: Se proporciona un metodo y aparato para control de recursos de radio en un sistema de comunicacion de multiplexado de division de frecuencia ortogonal (OFDM) de entrada multiple y salida multiple (MIMO). La metrica de canal se calcula para cada una de una pluralidad de antenas transmisoras. Se asignan subportadoras a cada antena transmisora de acuerdo con la metrica de canal de cada antena transmisora. Se transmiten las senales utilizando las subportadoras asignadas a cada antena. Se pude implementar adicionalmente modulacion y codificacion asi como control de potencia de transmision adaptables de cada subportadora de acuerdo con la metrica de canal. El control de potencia se puede implementar en base por antena o en base por subportadoras. Al realizar el control de potencia, se pueden seleccionar un subconjunto de antenas transmisoras y se puede aplicar la transferencia uniforme unicamente a las antenas seleccionadas. La transferencia uniforme se puede basar en SNR en vez de respuesta de canal.

公开(公告)号：BRPI0415785A

公开(公告)日：2007-03-06

申请号：BRPI0415785

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 ,  H04Q7/00

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：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：NO20062435A

公开(公告)日：2006-08-02

申请号：NO20062435

申请日：2006-05-29

Applicant: INTERDIGITAL TECH CORP

Inventor： STERNBERG GREGORY S ,  YANG RUI ,  LI BIN ,  PIETRASKI PHILIP J

IPC: H04L25/02 ,  H04L1/00 ,  H04L1/20 ,  H04L12/66 ,  H04Q7/28

CPC classification number: H04L1/0026 ,  H04L1/20 ,  H04L25/0202

公开(公告)号：CA2589756A1

公开(公告)日：2006-06-15

申请号：CA2589756

申请日：2005-11-30

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J

IPC: H04B1/69 ,  H04B1/707 ,  H04B1/713

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：NO20061560L

公开(公告)日：2006-06-09

申请号：NO20061560

申请日：2006-04-06

Applicant: INTERDIGITAL TECH CORP

Inventor： LI BIN ,  PIETRASKI PHILIP J ,  STERNBERG GREGORY S

IPC: H04L1/20 ,  H04L27/38

Abstract: A method and apparatus for estimating attributes of a received signal that includes a plurality of transmitted signals are provided. The amplitude of the received signal is estimated by performing a method of demodulation based on known signal information. The amplitude of an M-ary quadrature amplitude modulated signal is estimated based upon known or ascertainable phase information regarding a plurality of transmitted symbols. The amplitude of a q-ary amplitude shift keyeing signal is estimated based upon known or ascertainable magnitude information regarding a plurality of transmitted symbols. Statistical information is also used for amplitude estimation.

公开(公告)号：NO20061560A

公开(公告)日：2006-06-09

申请号：NO20061560

申请日：2006-04-06

Applicant: INTERDIGITAL TECH CORP

Inventor： LI BIN ,  PIETRASKI PHILIP J ,  STERNBERG GREGORY S

IPC: H04L1/20 ,  H04L27/38

CPC classification number: H04L27/38 ,  H04L1/20

公开(公告)号：CA2586703A1

公开(公告)日：2006-05-18

申请号：CA2586703

申请日：2005-10-20

Applicant: INTERDIGITAL TECH CORP

Inventor： PIETRASKI PHILIP J ,  DEMIR ALPASLAN ,  BELURI MIHAELA C

IPC: H03H7/30

Abstract: A step-size estimator for controlling the step-size of an adaptive equalizer incorporated in a transceiver, (e.g., a wireless transmit/receive unit (WTRU)). The step-size estimator updates at least one adaptive equalizer tap used by the adaptive equalizer based on an apparent speed of a channel established between the transceiver and another transceiver. The step-size estimator includes a speed estimator, a signal-to-noise ratio (SNR) averager and a step-size mapping unit. The speed estimator is used to estimate the apparent speed of the channel, (i.e., the observed and/or measured rate of change of the channel impulse response). The SNR averager generates a common pilot channel (CPICH) SNR estimate. The step-size mapping unit uses the speed estimate and the CPICH SNR estimate to generate a step-size parameter, µ, and a filter taps leakage factor parameter, ±, used by the adaptive equalizer to update the filter tap coefficient.