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Efficient decoding of Reed-Solomon codes beyond half the minimum distance

机译:里德-所罗门码的有效解码超过最小距离的一半

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A list decoding algorithm is presented for [n,k] Reed-Solomon (RS) codes over GF(q), which is capable of correcting more than [(n-k)/2] errors. Based on a previous work of Sudan (see J. Compl., vol.13, p.180-93, 1997), an extended key equation (EKE) is derived for RS codes, which reduces to the classical key equation when the number of errors is limited to [(n-k)/2]. Generalizing Massey's (1969) algorithm that finds the shortest recurrence that generates a given sequence, an algorithm is obtained for solving the EKE in time complexity O(l/spl middot/(n-k)/sup 2/), where l is a design parameter, typically a small constant, which s an upper bound on the size of the list of decoded codewords. (The case l=1 corresponds to classical decoding of up to [(n-k)/2] errors where the decoding ends with at most one codeword.) This improves on the time complexity O(n/sup 3/) needed for solving the equations of Sudan's algorithm by a naive Gaussian elimination. The polynomials found by solving the EKE are then used for reconstructing the codewords in time complexity O((llog/sup 2/l)k(n+llogq)) using root-finders of degree-l univariate polynomials.
机译:针对GF(q)上的[n,k] Reed-Solomon(RS)码,提出了一种列表解码算法,该算法能够校正[[n-k)/ 2]个以上的错误。根据苏丹的先前工作(请参见J. Compl。,第13卷,第180-93页,1997年),为RS码推导了扩展密钥方程(EKE),当数字为错误数限制为[(nk)/ 2]。概括了Massey(1969)的算法,该算法找到了生成给定序列的最短重复发生时间,从而获得了一种算法,用于求解时间复杂度为O(l / spl middot /(nk)/ sup 2 /)的EKE,其中l是设计参数,通常是一个小常数,它是已解码代码字列表的大小的上限。 (情况l = 1对应于最多[[nk] / 2]个错误的经典解码,其中解码最多以一个码字结束。)这提高了解决该问题所需的时间复杂度O(n / sup 3 /)。朴素高斯消除法求解苏丹算法的方程组。然后,使用1级单变量多项式的根查找器将通过求解EKE得出的多项式用于重建时间复杂度O((llog / sup 2 / l)k(n + llogq))的码字。

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