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arXiv 0908.2828cs.ITmath.IT
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从率失真角度分析Reed-Solomon码的多次译码尝试

A Rate-Distortion Perspective on Multiple Decoding Attempts for Reed-Solomon Codes

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

摘要:

最近,许多作者提出了基于简单RS译码算法的多次试验的RS码译码方案。在本文中,我们提出了一个率失真(R-D)的方法来分析这些RS码的多重译码算法。这种方法首先用于理解RS码多错误和擦除解码的渐进性能与复杂度的权衡。通过在错误模式和擦除模式之间定义适当的失真度量,单个错误和擦除解码成功的条件减少到将失真与固定阈值进行比较的形式。寻找最佳的一组擦除模式的多个解码试验,然后原来是一个覆盖问题,可以解决渐近的率失真理论。接着,将该方法推广到RS码的多重代数软判决译码。相应的失真措施的R-D函数的分析和数值计算进行了讨论。仿真结果表明,使用这种方法提出的算法性能优于其他算法具有相同的复杂度。

英文摘要:

Recently, a number of authors have proposed decoding schemes for Reed-Solomon (RS) codes based on multiple trials of a simple RS decoding algorithm. In this paper, we present a rate-distortion (R-D) approach to analyze these multiple-decoding algorithms for RS codes. This approach is first used to understand the asymptotic performance-versus-complexity trade-off of multiple error-and-erasure decoding of RS codes. By defining an appropriate distortion measure between an error pattern and an erasure pattern, the condition for a single error-and-erasure decoding to succeed reduces to a form where the distortion is compared to a fixed threshold. Finding the best set of erasure patterns for multiple decoding trials then turns out to be a covering problem which can be solved asymptotically by rate-distortion theory. Next, this approach is extended to analyze multiple algebraic soft-decision (ASD) decoding of RS codes. Both analytical and numerical computations of the R-D functions for the corresponding distortion measures are discussed. Simulation results show that proposed algorithms using this approach perform better than other algorithms with the same complexity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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