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arXiv 1302.6562cs.ITcs.DMmath.IT
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删除纠错码基数Levenshtein上界的改进

An Improvement to Levenshtein's Upper Bound on the Cardinality of Deletion Correcting Codes

Daniel Cullina, Negar Kiyavash

摘要:

我们考虑q元字母表上的删除纠错码。众所周知,任何能够纠正s个删除的代码也可以纠正s个总插入和删除的任何组合。为了获得渐近上界的代码大小,我们应用一个包装参数的通道,执行不同的插入和删除的混合。尽管所有这些通道的代码集都是相同的,但我们得到的界限各不相同。在此之前的工作,只有对应于所有插入情况和所有删除情况的界限是已知的。我们把这些作为特例来回收。从所有删除的情况下,由于Levenshtein的约束,已是最有名的超过45年。我们的广义界是优于Levenshtein的界时,删除的数量要纠正的是大于字母表的大小。

英文摘要:

We consider deletion correcting codes over a q-ary alphabet. It is well known that any code capable of correcting s deletions can also correct any combination of s total insertions and deletions. To obtain asymptotic upper bounds on code size, we apply a packing argument to channels that perform different mixtures of insertions and deletions. Even though the set of codes is identical for all of these channels, the bounds that we obtain vary. Prior to this work, only the bounds corresponding to the all insertion case and the all deletion case were known. We recover these as special cases. The bound from the all deletion case, due to Levenshtein, has been the best known for more than forty five years. Our generalized bound is better than Levenshtein's bound whenever the number of deletions to be corrected is larger than the alphabet size.

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