arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2406.16656cs.ITcs.DMmath.COmath.IT
收藏

纠正多次删除错误的置换码与多重置换码

Permutation and Multi-permutation Codes Correcting Multiple Deletions

Shuche Wang, The Nguyen, Yeow Meng Chee, Van Khu Vu

AI总结:

本研究改进了Ulam度量下可纠多次删除错误的置换码的Gilbert–Varshamov界,提出基于新映射的低冗余置换码构造方法并拓展至多置换场景,得到当前最优的Ulam度量多重置换码。

摘要:

近年来,能够纠正多次删除错误的Ulam度量下的置换码得到了广泛研究。在本工作中,我们关注Ulam度量下置换码的最大码长,旨在设计具备高效译码算法的可纠正多次删除错误的置换码。我们首先通过分析辅助图的独立数,对这类置换码最大码长的Gilbert–Varshamov界进行了改进。该思路已在多种场景中得到广泛应用,我们在这一部分的贡献是枚举了辅助图中的三角形数量,并证明其数量足够小。接下来,我们设计了具备译码算法的可纠正多次删除错误的置换码。具体而言,所构造的置换码能够纠正t次删除错误,冗余比特数至多为(3t-1) log n+o(log n),其中n为码长。我们的构造基于一种新的映射,该映射建立了汉明度量下的置换码与多种度量下的置换码之间的新联系。此外,我们利用这种新映射构造了可纠正多突发删除错误的置换码。最后,我们将该新映射推广至多重置换场景,构造出了目前已知性能最优的Ulam度量下的多重置换码。

英文摘要:

Permutation codes in the Ulam metric, which can correct multiple deletions, have been investigated extensively recently. In this work, we are interested in the maximum size of permutation codes in the Ulam metric and aim to design permutation codes that can correct multiple deletions with efficient decoding algorithms. We first present an improvement on the Gilbert--Varshamov bound of the maximum size of these permutation codes by analyzing the independence number of the auxiliary graph. The idea is widely used in various cases and our contribution in this section is enumerating the number of triangles in the auxiliary graph and showing that it is small enough. Next, we design permutation codes correcting multiple deletions with a decoding algorithm. In particular, the constructed permutation codes can correct $t$ deletions with at most $(3t-1) \log n+o(\log n)$ bits of redundancy where $n$ is the length of the code. Our construction is based on a new mapping which yields a new connection between permutation codes in the Hamming metric and permutation codes in various metrics. Furthermore, we construct permutation codes that correct multiple bursts of deletions using this new mapping. Finally, we extend the new mapping for multi-permutations and construct the best-known multi-permutation codes in Ulam metric.

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。

↑