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arXiv 1408.4963cs.ITmath.IT
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Kendall $τ$ -度量下置换码长度的界

Bounds on the Size of Permutation Codes with the Kendall $τ$-Metric

Sarit Buzaglo, Tuvi Etzion

摘要:

为了在非易失性存储器中有效地写入和存储数据,已经提出了秩调制方案。秩调制方案中的纠错通过考虑置换码来完成。本文考虑$n$元素上所有置换的集合$S_n$中的码,使用Kendall $τ$ -度量.本文的主要目标是得到新的界限,这样的代码的大小。为了这个目的,我们也考虑完美的代码,直径完美的代码,和最佳的反码的大小在肯德尔$τ$度量,结构有自己的相当大的兴趣。本文证明了$S_n$中不存在完美的单纠错码,其中$n>4$是素数或$4\leq n\leq 10$。我们提出了最佳的反码奇直径的大小的下界。作为结果,我们得到了一个新的上限的代码的大小在$S_n$甚至最小的Kendall $τ$ -距离。我们提出了比$S_5$和$S_7$中已知的更大的单纠错码。

英文摘要:

The rank modulation scheme has been proposed for efficient writing and storing data in non-volatile memory storage. Error-correction in the rank modulation scheme is done by considering permutation codes. In this paper we consider codes in the set of all permutations on $n$ elements, $S_n$, using the Kendall $τ$-metric. The main goal of this paper is to derive new bounds on the size of such codes. For this purpose we also consider perfect codes, diameter perfect codes, and the size of optimal anticodes in the Kendall $τ$-metric, structures which have their own considerable interest. We prove that there are no perfect single-error-correcting codes in $S_n$, where $n>4$ is a prime or $4\leq n\leq 10$. We present lower bounds on the size of optimal anticodes with odd diameter. As a consequence we obtain a new upper bound on the size of codes in $S_n$ with even minimum Kendall $τ$-distance. We present larger single-error-correcting codes than the known ones in $S_5$ and $S_7$.

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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