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Method and apparatus for estimating the step-size of an adaptive equalizer

An equalizer and adaptive technology, applied in delay line applications, baseband system components, digital transmission systems, etc., can solve problems affecting the original bit error rate and error adjustment error of the adaptive equalizer

Inactive Publication Date: 2010-10-06
INTERDIGITAL TECH CORP
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Problems solved by technology

[0004] However, large step sizes may produce misalignment errors, which affect the raw bit error rate (BER) performance of the adaptive equalizer
Because the step size used is approximately the closest, points on the vector may reach the desired point, so the error adjustment error is never fully reached due to least mean square convergence

Method used

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  • Method and apparatus for estimating the step-size of an adaptive equalizer
  • Method and apparatus for estimating the step-size of an adaptive equalizer
  • Method and apparatus for estimating the step-size of an adaptive equalizer

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Embodiment Construction

[0013] Hereinafter, when referred to as a "WTRU", the term includes, but is not limited to, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or any other type of element operable in a wireless environment .

[0014] Hereinafter, when the term "transceiver" is used, it includes, but is not limited to, a base station, wireless transmit / receive unit, node B, access point (AP) or any other device that receives signals from or transmits signals to another transceiver. wireless communication device.

[0015] Hereinafter, when the terms "apparent channel velocity" and "apparent channel velocity" are referred to include but are not limited to An observed and / or measured rate of channel impulse response variation among other transceivers. Channel impulse response changes may result from movement of one or more transceivers, oscillator errors occurring in at least one transceiver, and movement of objects in the environment in which at least one transceiver ...

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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 generatea step-size parameter,[mu], and a filter taps leakage factor parameter, a, used by the adaptive equalizer to update the filter tap coefficient.

Description

technical field [0001] The present invention is concerned with controlling an adaptive equalizer incorporated in a transceiver such as a wireless transmit / receive unit (WTRU). More particularly, the present invention relates to updating the adaptive equalizer based on the channel apparent velocity (i.e., the observed and / or measured rate of channel impulse response change) established between the transceiver and another transceiver. At least one filter tap coefficient is used. Background technique [0002] Adaptive equalizer based receivers such as Normalized Least Mean Square (NLMS) based receivers can provide high speed downlink packet access like Frequency Division Duplex (FDD) on Rake receivers (HSDPA) or Code Division Multiple Access (CDMA) 2000 Evolution Voice (EV-DV) for superior performance in high data rate services. A typical normalized least mean square receiver includes an adaptive equalizer with an equalizer filter and a tap coefficient generator for generatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/30
CPCH04L25/03019H04L2025/03687H04B2201/70701H04L25/03H03K5/159H04L65/00
Inventor 菲利普·J·佩特拉斯基米海拉·贝露里艾佩斯兰·戴米尔
Owner INTERDIGITAL TECH CORP