Apparatus and method for constraining the value of feedback filter tap coefficients in a decision feedback equalizer

A decision feedback equalization and tap coefficient technology, applied in transmission systems, earthmoving, baseband systems, etc., can solve problems such as the degree of degradation of DFE performance

Inactive Publication Date: 2005-07-06
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

For severe post-echo and pre-echo, the feedback filter tap coefficient g n k The value of can grow to the point where they degrade the performance of the DFE through error propagation

Method used

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  • Apparatus and method for constraining the value of feedback filter tap coefficients in a decision feedback equalizer

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Embodiment Construction

[0037] discussed below Figures 1 to 7 And the various embodiments used to describe the principles of the invention in this patent document are by way of illustration only and should not be construed in any way as limiting the scope of the invention. The present invention for constraining the values ​​of the feedback filter tap coefficients in a decision feedback equalizer to reduce error propagation can be used in any system employing a decision feedback equalizer.

[0038] In the following description of example embodiments, the invention may be integrated into or used in conjunction with a decision feedback equalizer within a digital television receiver. The invention is not limited to use in digital television systems. Those skilled in the art will recognize that the exemplary embodiments of the present invention can be readily modified for use in any type of digital receiver system using a decision feedback equalizer, including without limitation digital television syste...

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Abstract

An apparatus and method is disclosed for reducing error propagation in a decision feedback equalizer by constraining the values of feedback filter tap coefficients in a feedback filter of the decision feedback equalizer. The feedback filter tap coefficients that are constrained are calculated using a constraint cost function and a related constraint function. The constraint condition of the present invention reduces error propagation in a decision feedback equalizer by preventing error from circulating in a feedback loop of a feedback filter within the decision feedback equalizer.

Description

technical field [0001] The present invention is directed generally to decision feedback equalizers in digital communication devices, and more particularly to an apparatus and method for constraining the values ​​of feedback filter tap coefficients in decision feedback equalizers to reduce error propagation. Background technique [0002] The Digital High Definition Television (HDTV) Grand Alliance is a group of television manufacturing and research organizations in the television industry. After years of collaborative efforts, the Grand Alliance developed and proposed standards for digital HDTV systems. The Grand Alliance standard has been adopted (with minor changes) by the Federal Communications Commission (FCC) as the official broadcast standard for HDTV. This standard is known as the Advanced Television Systems Committee Digital Television Standard ("ATSC Standard"). [0003] The ATSC standard for HDTV transmission over terrestrial broadcast channels uses a signal consi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/06H04L25/03
CPCH04L25/03057H04L2025/03681H04N7/015
Inventor D·比尔鲁
Owner KONINK PHILIPS ELECTRONICS NV
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