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.

公开(公告)号：NO20060063L

公开(公告)日：2006-01-30

申请号：NO20060063

申请日：2006-01-05

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  HAQUE TANBIR ,  DEMIR ALPASLAN

IPC: H03M1/12 ,  H03G3/30 ,  H04B1/16 ,  H04L25/66

Abstract: A communication system including an amplifier, a receiver, an analog to digital converter (ADC) and an insertion phase variation compensation module. The amplifier receives a communication signal. If the amplifier is enabled, the amplifier amplifies the communication signal and outputs the amplified communication signal to the receiver. If the amplifier is disabled, the amplifier passes the communication signal to the receiver without amplifying it. The receiver outputs an analog complex signal to the ADC. The ADC outputs a digital complex signal to the insertion phase variation compensation module which counteracts the effects of a phase offset intermittently introduced into the communication signal when the amplifier is enabled or disabled.

公开(公告)号：NO20060063A

公开(公告)日：2006-01-30

申请号：NO20060063

申请日：2006-01-05

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  HAQUE TANBIR ,  DEMIR ALPASLAN

IPC: H03M1/12 ,  H03G3/30 ,  H04B1/16 ,  H04L25/66

CPC classification number: H03G3/3052

公开(公告)号：NO20060035A

公开(公告)日：2006-01-04

申请号：NO20060035

申请日：2006-01-04

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  HAQUE TANBIR ,  DEMIR ALPASLAN

IPC: H04L27/04 ,  H03C3/40 ,  H04B1/30 ,  H04L27/00

CPC classification number: H04B1/30 ,  H03C3/406 ,  H04L2027/0016 ,  H04L2027/0018

公开(公告)号：CA2562111A1

公开(公告)日：2005-10-27

申请号：CA2562111

申请日：2005-03-18

Applicant: INTERDIGITAL TECH CORP

Inventor： HAQUE TANBIR ,  KAZAKEVICH LEONID ,  DEMIR ALPASLAN ,  KLAHN GERALD

IPC: H04B7/00 ,  H03C1/62 ,  H03F3/04 ,  H03F3/68 ,  H03G3/30 ,  H04B1/04 ,  H04B1/46 ,  H04B7/005 ,  H04B17/00

Abstract: A method and apparatus for dynamically adjusting the impedance between a transmitter's power amplifier (PA) and antenna to efficiently transfer power from the PA to the antenna. The impedance between the PA and the antenna is adjusted based on power level measurements and/or PA direct current (DC) consumption measurements, depending on whether the PA is a linear PA or a switch-mode PA. In another embodiment, a hybrid PA including a first stage linear PA and a second stage switch-mode PA is implemented in a transmitter. The hybrid PA selectively connects the output of the first stage linear PA t o one of the input of the second stage switch-mode PA and the output of the hybrid PA, depending on the output power level of the first stage linear PA, the output power level of the hybrid PA, or a requirement indicated by a transmit power control (TPC) command.

公开(公告)号：NO20052886D0

公开(公告)日：2005-06-14

申请号：NO20052886

申请日：2005-06-14

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  DEMIR ALPASLAN ,  OZLUTURK FAITH

IPC: H04B7/005 ,  H04B7/08 ,  H04B

Abstract: A wireless transmit/receive unit (WTRU) has multiple receivers with an interface to combine received signals to provide enhanced reception. A control unit selectively controls the powering of the receivers to limit power consumption based on selected parameters.

公开(公告)号：CA2528455A1

公开(公告)日：2005-01-06

申请号：CA2528455

申请日：2004-05-05

Applicant: INTERDIGITAL TECH CORP

Inventor： DEMIR ALPASLAN ,  HAQUE TANBIR ,  KAZAKEVICH LEONID

IPC: H04L25/66 ,  H03G3/30 ,  H04B1/16 ,  H04L25/10

Abstract: A communication system including an amplifier (105), a receiver (110), an analog to digital converter (ADC 115) and an insertion phase variation compensation module (120). The amplifier receives a communication signal (150). If the amplifier is enabled, the amplifier amplifies the communicatio n signal and outputs the amplified communication signal to the receiver. If th e amplifier is disabled, the amplifier passes the communication signal to the receiver without amplifying it. The receiver outputs an analog complex signa l to the ADC. The ADC outputs a digital complex signal to the insertion phase variation compensation module which counteracts the effects of a phase offse t intermittently introduced into the communication signal when the amplifier i s enabled or disabled.

公开(公告)号：AU2003290783A1

公开(公告)日：2004-06-15

申请号：AU2003290783

申请日：2003-11-14

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  OZLUTURK FATIH ,  DEMIR ALPASLAN

IPC: H04B7/005 ,  H04B7/08

Abstract: A wireless transmit/receive unit (WTRU) has multiple receivers with an interface to combine received signals to provide enhanced reception. A control unit selectively controls the powering of the receivers to limit power consumption based on selected parameters.

公开(公告)号：AU2003254244A8

公开(公告)日：2004-02-16

申请号：AU2003254244

申请日：2003-07-28

Applicant: INTERDIGITAL TECH CORP

Inventor： DEMIR ALPASLAN

IPC: H04B1/707 ,  H04L27/00 ,  H04L27/06 ,  H04L27/08

Abstract: A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal by correlating a synchronization code channel with training sequences to estimate relative offsets which are employed to estimate an error, which is then filtered. The filtered output preferably provides a voltage controlling a voltage controlled oscillator (VCO). The same technique may be employed to control a numeric controlled oscillator (NCO).

公开(公告)号：CA2599806C

公开(公告)日：2013-12-31

申请号：CA2599806

申请日：2002-02-04

Applicant: INTERDIGITAL TECH CORP

Inventor： DEMIR ALPASLAN ,  GRIECO DONALD M

IPC: H04W56/00 ,  H04B1/707 ,  H04B7/26 ,  H04J3/06 ,  H04L7/04 ,  H04W48/16

Abstract: A system and method for establishing initial synchronization for the link between a UE and a base station in a communication network uses window exclusion logic in order to avoid a deadlock condition upon a detection of the wrong public land mobile network (PLMN). The communication signal is processed in a three step decision process. The first decision step determines a chip offset of the strongest path detected over a frame of samples. In response to the first decision, the second step generates a scrambling code group number and slot offset for retrieving the secondary synchronization code. The third decision step retrieves a primary scrambling code in response to the code group number for synchronizing the UE to the base station.