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Discrete Applied Mathematics

Recursive error correction for general Reed–Muller codes

Ilya I. Dumer, Kirill Shabunov

Published Sep 20, 2005• 18 citations
Publisher
DOI
10.1016/j.dam.2005.05.013

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Efficiently decoding Reed-Muller codes from random errors

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Reed-Muller codes encode an $m$-variate polynomial of degree $r$ by evaluating it on all points in $\{0,1\}^m$. We denote this code by $RM(m,r)$. The minimal distance of $RM(m,r)$ is $2^{m-r}$ and so it cannot correct more than half that number of errors in the worst case. For random errors one may hope for a better result. In this work we give an efficient algorithm (in the block length $n=2^m$) for decoding random errors in Reed-Muller codes far beyond the minimal distance. Specifically, for low rate codes (of degree $r=o(\sqrt{m})$) we can correct a random set of $(1/2-o(1))n$ errors with high probability. For high rate codes (of degree $m-r$ for $r=o(\sqrt{m/\log m})$), we can correct roughly $m^{r/2}$ errors. More generally, for any integer $r$, our algorithm can correct any error pattern in $RM(m,m-(2r+2))$ for which the same erasure pattern can be corrected in $RM(m,m-(r+1))$. The results above are obtained by applying recent results of Abbe, Shpilka and Wigderson (STOC, 2015), Kumar and Pfister (2015) and Kudekar et al. (2015) regarding the ability of Reed-Muller codes to correct random erasures. The algorithm is based on solving a carefully defined set of linear equations and thus it is significantly different than other algorithms for decoding Reed-Muller codes that are based on the recursive structure of the code. It can be seen as a more explicit proof of a result of Abbe et al. that shows a reduction from correcting erasures to correcting errors, and it also bares some similarities with the famous Berlekamp-Welch algorithm for decoding Reed-Solomon codes.

arXiv:1503.09092•Mar 31, 2015•2 citations

Error exponents for two soft decision decoding algorithms of Reed-Muller codes

M. V. Burnashev, Ilya I. Dumer

Error exponents are studied for the recursive and majority decoding algorithms of general Reed-Muller codes RM(r, m) used on the AWGN channels. Both algorithms have low decoding complexity and substantially outperform bounded distance decoding in their error-correcting capabilities. We obtain asymptotically tight upper bounds on the output error rate that hold for both algorithms and can be used for any RM-code.

IEEE International Symposium on Information Theory (ISIT)•Jul 1, 2008•2 citations
Reed-Muller codes encode an mmm-variate polynomial of degree rrr by evaluating it on all points in {0,1}m\{0,1\}^m{0,1}m. We denote this code by RM(m,r)RM(m,r)RM(m,r). The minimal distance of RM(m,r)RM(m,r)RM(m,r) is 2m−r2^{m-r}2m−r and so it cannot correct more than half that number of errors in the worst case. For random errors one may hope for a better result. In this work we give an efficient algorithm (in the block length n=2mn=2^mn=2m) for decoding random errors in Reed-Muller codes far beyond the minimal distance. Specifically, for low rate codes (of degree r=o(m)r=o(\sqrt{m})r=o(m​)) we can correct a random set of (1/2−o(1))n(1/2-o(1))n(1/2−o(1))n errors with high probability. For high rate codes (of degree m−rm-rm−r for r=o(m/log⁡m)r=o(\sqrt{m/\log m})r=o(m/logm​)), we can correct roughly mr/2m^{r/2}mr/2 errors. More generally, for any integer rrr, our algorithm can correct any error pattern in RM(m,m−(2r+2))RM(m,m-(2r+2))RM(m,m−(2r+2)) for which the same erasure pattern can be corrected in RM(m,m−(r+1))RM(m,m-(r+1))RM(m,m−(r+1)). The results above are obtained by applying recent results of Abbe, Shpilka and Wigderson (STOC, 2015), Kumar and Pfister (2015) and Kudekar et al. (2015) regarding the ability of Reed-Muller codes to correct random erasures. The algorithm is based on solving a carefully defined set of linear equations and thus it is significantly different than other algorithms for decoding Reed-Muller codes that are based on the recursive structure of the code. It can be seen as a more explicit proof of a result of Abbe et al. that shows a reduction from correcting erasures to correcting errors, and it also bares some similarities with the famous Berlekamp-Welch algorithm for decoding Reed-Solomon codes.