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arXiv cs/0507068cs.ITcs.DMmath.IT
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用于迭代擦除解码的奇偶检验集合,其校正给定大小的所有可校正擦除模式

On parity check collections for iterative erasure decoding that correct all correctable erasure patterns of a given size

Henk D. L. Hollmann, Ludo M. G. M. Tolhuizen

摘要:

最近,人们对构造小的奇偶检验集以用于汉明码的迭代解码产生了兴趣,该汉明码具有这样的性质,即每个大小为3的不可校正(或停止)集是码字的支持,因此无论如何都是不可校正的。在这里,我们重新制定和概括的问题,并改善这个结构。首先,我们表明,一个奇偶检验收集,纠正所有可纠正的擦除模式的大小为m的r阶汉明码(即,汉明码与余维r)提供了所有代码的余维$r$相应的"通用“奇偶检验收集与此属性。这自然导致了一个必要和充分的条件,这种通用的奇偶检验收集。我们使用这个条件来构建一个通用的奇偶检验收集的代码余维r纠正所有可纠正的擦除模式的大小最多为m,为所有r和m <= r,从而推广了已知的结构为m=3。然后我们讨论了我们构造的最优性,并证明了当m>=3和r足够大时,它是可以改进的。最后,我们讨论了进一步研究的方向。

英文摘要:

Recently there has been interest in the construction of small parity check sets for iterative decoding of the Hamming code with the property that each uncorrectable (or stopping) set of size three is the support of a codeword and hence uncorrectable anyway. Here we reformulate and generalise the problem, and improve on this construction. First we show that a parity check collection that corrects all correctable erasure patterns of size m for the r-th order Hamming code (i.e, the Hamming code with codimension r) provides for all codes of codimension $r$ a corresponding ``generic'' parity check collection with this property. This leads naturally to a necessary and sufficient condition on such generic parity check collections. We use this condition to construct a generic parity check collection for codes of codimension r correcting all correctable erasure patterns of size at most m, for all r and m <= r, thus generalising the known construction for m=3. Then we discussoptimality of our construction and show that it can be improved for m>=3 and r large enough. Finally we discuss some directions for further research.

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