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arXiv 1002.0043cs.ITmath.IT
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Reed-Solomon码多次译码的率失真指数方法

A Rate-Distortion Exponent Approach to Multiple Decoding Attempts for Reed-Solomon Codes

Phong S. Nguyen, Henry D. Pfister, Krishna R. Narayanan

摘要:

基于RS码多次译码尝试的算法近年来引起了人们的关注。如作者先前所提出的,基于率失真(R-D)理论选择解码候选者目前提供了最佳的性能与复杂度的权衡。本文提出了一种基于率失真指数(RDE)的分析方法,直接使误码概率的指数衰减率最小化。这使得严格的边界上的错误概率有限长度的RS码,并导致适度的性能增益。作为一个副产品,一个数值方法推导出计算独立的非相同的源的率失真指数。分析结果给出错误/擦除解码。

英文摘要:

Algorithms based on multiple decoding attempts of Reed-Solomon (RS) codes have recently attracted new attention. Choosing decoding candidates based on rate-distortion (R-D) theory, as proposed previously by the authors, currently provides the best performance-versus-complexity trade-off. In this paper, an analysis based on the rate-distortion exponent (RDE) is used to directly minimize the exponential decay rate of the error probability. This enables rigorous bounds on the error probability for finite-length RS codes and leads to modest performance gains. As a byproduct, a numerical method is derived that computes the rate-distortion exponent for independent non-identical sources. Analytical results are given for errors/erasures decoding.

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