公开(公告)号：EP1810402A2

公开(公告)日：2007-07-25

申请号：EP05814908.9

申请日：2005-10-20

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： PIETRASKI, Philip, J. ,  BELURI, Mihaela ,  DEMIR, Alpaslan

IPC: H03H7/30

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

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, α, used by the adaptive equalizer to update the filter tap coefficient.

Abstract translation: 步长估计器用于控制并入收发器（例如，无线发射/接收单元（WTRU））中的自适应均衡器的步长。 步长估计器基于在收发器和另一收发器之间建立的信道的表观速度来更新由自适应均衡器使用的至少一个自适应均衡器抽头。 步长估计器包括速度估计器，信噪比（SNR）平均器和步长映射单元。 速度估计器用于估计信道的视在速度（即，观测和/或测量的信道脉冲响应的变化率）。 SNR平均器生成公共导频信道（CPICH）SNR估计。 步长映射单元使用速度估计和CPICH SNR估计来生成步长参数μ和滤波器抽头泄漏因子参数α，自适应均衡器使用该参数来更新滤波器抽头系数。

公开(公告)号：EP1632074A2

公开(公告)日：2006-03-08

申请号：EP04785738.8

申请日：2004-04-30

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  KAZAKEVICH, Leonid ,  HAQUE, Tanbir

IPC: H04L27/04

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

Abstract: A method and system for determining at least one DC offset compensation value used to suppress carrier leakage occurring on real (184) and imaginary (186) signal paths in an analog radio transmitter when a significant temperature change (168) in the transmitter is detected. At least one DC offset signal having a level that corresponds to the at least one DC offset compensation value is provided to a digital DC offset compensation module which adjusts the DC level of at least one of the real and imaginary signal paths (184 and 186).

公开(公告)号：EP1537678A1

公开(公告)日：2005-06-08

申请号：EP03755821.0

申请日：2003-09-12

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： PIETRASKI, Philip, J. ,  DEMIR, Alpaslan ,  GRIECO, Donald, M.

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

CPC classification number: H04B1/70735 ,  H04B1/70755 ,  H04B1/7083 ,  H04B1/709 ,  H04B1/7103 ,  H04B2201/70707

Abstract: The invention provides embodiments to facilitate cell search. In one embodiment, received samples are split into a plurality of sample sets for processing. Each of the sets is processed and an accumulated result is divided by an estimated noise value. In another embodiment, a code correlator correlates the received signal with a primary synchronization code and an auxiliary code correlator having a same length as the code correlator correlates the received signal with a code having a low cross correlation with the primary synchronization code. In another embodiment, a division of an accumulated result with a noise estimate is performed using indexes of the most significant bits.

公开(公告)号：EP1435139A1

公开(公告)日：2004-07-07

申请号：EP02784077.6

申请日：2002-10-10

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  OZLUTURK, Fatih, M.

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

CPC classification number: H04B1/708 ,  H04B1/70735 ,  H04B1/7077 ,  H04B1/7093 ,  H04B2201/7071

Abstract: A User Equipment (UE) has as circuit that performs the acquisition for the low chip rate option of the Universal Mobile Telecommunication System (UMTS) Time Division Duplex (TDD) standard as formulated by the Third Generation Partnership Project (3GPP). The present invention implements the detection (10) of the basic SYNC code; the determination (20) of the midamble used and the detection (30) of the superframe timing based on SYNC code modulation sequence. This enables reading of a full Broadcast Channel (BCH) message.

公开(公告)号：EP1435139B9

公开(公告)日：2009-07-08

申请号：EP02784077.6

申请日：2002-10-10

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  OZLUTURK, Fatih, M.

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

CPC classification number: H04B1/708 ,  H04B1/70735 ,  H04B1/7077 ,  H04B1/7093 ,  H04B2201/7071

Abstract: A User Equipment (UE) has as circuit that performs the acquisition for the low chip rate option of the Universal Mobile Telecommunication System (UMTS) Time Division Duplex (TDD) standard as formulated by the Third Generation Partnership Project (3GPP). The present invention implements the detection (10) of the basic SYNC code; the determination (20) of the midamble used and the detection (30) of the superframe timing based on SYNC code modulation sequence. This enables reading of a full Broadcast Channel (BCH) message.

公开(公告)号：EP1642392B9

公开(公告)日：2008-10-01

申请号：EP04752756.9

申请日：2004-05-20

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  KAZAKEVICH, Leonid ,  HAQUE, Tanbir

IPC: H03D3/00

CPC classification number: H03D3/009

公开(公告)号：EP1632039A1

公开(公告)日：2006-03-08

申请号：EP04751475.7

申请日：2004-05-06

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  KAZAKEVICH, Leonid ,  OZLUTURK, Fatih ,  NARAYAN, Geetha, Lakshmi

IPC: H04B7/00

CPC classification number: H04B1/30 ,  H03D3/008

Abstract: A digital baseband (DBB) receiver for receiving and processing a wireless communication signal. The DBB receiver includes at least one low noise amplifier (LNA), at least one demodulator, a direct current (DC) discharge circuit and an LNA control circuit. The LNA selectively amplifies the communication signal. The demodulator outputs analog real and imaginary signal components on real and imaginary signal paths, respectively, in response to receiving the communication signal from the LNA. The DC discharge circuit selectively discharges DC accumulating on at least one of the real and imaginary signal paths. The LNA control circuit turns the LNA on or off.

公开(公告)号：EP2005611A2

公开(公告)日：2008-12-24

申请号：EP07753415.4

申请日：2007-03-19

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： MONFET, Frederic ,  DEMIR, Alpaslan ,  RICHARDS, Mark, L.

IPC: H04B1/707

CPC classification number: H04B1/7083 ,  H04B1/70735 ,  H04B2201/70707

Abstract: A method and apparatus for performing a power efficient cell search in a multi-cell wireless communication system are disclosed. A wireless transmit/receive unit (WTRU) having a memory that stores a cell identification list of prioritized previously top-ranked cell identities (IDs) is used to perform the cell search. A primary synchronization code (PSC) correlation peak location on a received signal is selected. A common pilot channel (CPICH) correlation value is determined by non-coherent integration of a local signal created based on a first cell ID on the cell identification list to the received signal. If the CPICH correlation value is greater than a noise threshold, thus indicating that the first cell ID is a newly found cell ID, or if a last cell ID in the cell identification list is reached, an additional determination is made as to whether there is more than one cell ID on the list having the same timing.

Abstract translation: 一种用于在多小区无线通信系统中执行功率有效的小区搜索的方法和装置是游离缺失盘。 具有存储器，一种无线发射/接收单元（WTRU）那样存储优先此前排名第一的小区标识（ID）的小区标识列表用于执行小区搜索。 对接收信号A的主同步码（PSC）相关峰值位置被选择。 公共导频信道（CPICH）相关值是确定性的非相干积分基于小区标识列表于所接收的信号上的第一小区ID创建的本地信号的开采。 如果CPICH相关值大于噪声阈值，从而指示所做的第一小区ID为新发现的小区ID，或如果达到在小区标识列表中的负载的小区ID，其中附加的判定，做出关于是否存在 具有相同的定时的列表上的多于一个的小区ID。

公开(公告)号：EP1807932A2

公开(公告)日：2007-07-18

申请号：EP05816112.6

申请日：2005-11-02

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： PIETRASKI, Philip, J. ,  BELURI, Mihaela ,  DEMIR, Alpaslan ,  PAN, Jung-Lin ,  STERNBERG, Gregory, S. ,  YANG, Rui ,  LI, Bin

IPC: H03H7/30

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：EP1636955A2

公开(公告)日：2006-03-22

申请号：EP04785744.6

申请日：2004-05-05

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： DEMIR, Alpaslan ,  KAZAKEVICH, Leonid ,  HAQUE, Tanbir

IPC: H04L25/66 ,  H04L25/10

CPC classification number: H03G3/3052

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 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.