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arXiv 2105.02004cs.ITmath.IT
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插入删除码的改进Singleton界及最优构造

Improved Singleton bound on insertion-deletion codes and optimal constructions

Bocong Chen, Guanghui Zhang

摘要:

插入删除码(insdel code)在同步纠错中起着重要的作用。最小insdel距离越大,代码可以纠正的insdel错误就越多。Haeupler和Shahrasbi建立了insdel码的Singleton界:$\mathbb{F}_q$上的任何$[n,k]$线性码的最小insdel距离满足$d\leq2n-2k+2.$已经有一些通过具有高性能的Reed-Solomon码构造的insdel码,但是没有一个接近这个界。最近,Do Duc { \it et al.}证明了如果$q$与码长$n$相比足够大,则任何$[n,k]$ Reed-Solomon码的最小insdel距离不超过$2n-2k$;还明确地构造了满足新界限的最优码。本文的贡献是双重的。首先证明了在$\mathbb{F}_q$上的任何$[n,k]$线性码的最小insdel距离满足$d\leq2n-2k$,如果$n>k>1$ .这一结果改进和推广了文献中已有的结果。然后给出了长度为$n$的二维Reed-Solomon码的最小insdel距离恰好等于$\mathbb{F}_q$上的$2n-4$的一个充分条件.因此,我们表明,充分条件并不难实现,我们明确地构建了一个无限的家庭的最佳二维Reed-Somolom码满足的界限。

英文摘要:

Insertion-deletion codes (insdel codes for short) play an important role in synchronization error correction. The higher the minimum insdel distance, the more insdel errors the code can correct. Haeupler and Shahrasbi established the Singleton bound for insdel codes: the minimum insdel distance of any $[n,k]$ linear code over $\mathbb{F}_q$ satisfies $d\leq2n-2k+2.$ There have been some constructions of insdel codes through Reed-Solomon codes with high capabilities, but none has come close to this bound. Recently, Do Duc {\it et al.} showed that the minimum insdel distance of any $[n,k]$ Reed-Solomon code is no more than $2n-2k$ if $q$ is large enough compared to the code length $n$; optimal codes that meet the new bound were also constructed explicitly. The contribution of this paper is twofold. We first show that the minimum insdel distance of any $[n,k]$ linear code over $\mathbb{F}_q$ satisfies $d\leq2n-2k$ if $n>k>1$. This result improves and generalizes the previously known results in the literature. We then give a sufficient condition under which the minimum insdel distance of a two-dimensional Reed-Solomon code of length $n$ over $\mathbb{F}_q$ is exactly equal to $2n-4$. As a consequence, we show that the sufficient condition is not hard to achieve; we explicitly construct an infinite family of optimal two-dimensional Reed-Somolom codes meeting the bound.

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