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arXiv 2305.05596cs.ITmath.IT
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高阶MDS码的结构

On the Structure of Higher Order MDS Codes

Harshithanjani Athi, Rasagna Chigullapally, Prasad Krishnan, Lalitha Vadlamani

AI总结:

本文研究高阶MDS码的结构,探讨其参数可扩展性条件,并给出新的域大小上界,以促进高效构造。

摘要:

长度为$n$的码被称为(组合意义上的)$(\rho,L)$-列表可解码的,如果半径为$\rho n$的汉明球(围绕在环境空间中的任意向量)不包含超过$L$个码字。我们研究了一类最近引入的高阶MDS码,这类码(通过对偶性)与达到列表可解码广义Singleton界的码密切相关。对于某个$\ell\geq 1$,长度为$n$、维度为$k$、阶为$\ell$的高阶MDS码记为$(n,k)$-MDS($\ell$)码。我们提出了关于这些码结构的若干结果,识别了其参数在各种场景下的“可扩展性”。具体来说,对于某些参数区域,我们确定了通过多种技术从$(n_2,k_2)$-MDS($\ell_2$)码获得$(n_1,k_1)$-MDS($\ell_1$)码的条件。我们相信这些结果将有助于高效构造高阶MDS码。我们还获得了此类码存在性的一个新的域大小上界,在某些参数区域中,该上界据称优于现有最佳已知界。

英文摘要:

A code of length $n$ is said to be (combinatorially) $(ρ,L)$-list decodable if the Hamming ball of radius $ρn$ around any vector in the ambient space does not contain more than $L$ codewords. We study a recently introduced class of higher order MDS codes, which are closely related (via duality) to codes that achieve a generalized Singleton bound for list decodability. For some $\ell\geq 1$, higher order MDS codes of length $n$, dimension $k$, and order $\ell$ are denoted as $(n,k)$-MDS($\ell$) codes. We present a number of results on the structure of these codes, identifying the `extend-ability' of their parameters in various scenarios. Specifically, for some parameter regimes, we identify conditions under which $(n_1,k_1)$-MDS($\ell_1$) codes can be obtained from $(n_2,k_2)$-MDS($\ell_2$) codes, via various techniques. We believe that these results will aid in efficient constructions of higher order MDS codes. We also obtain a new field size upper bound for the existence of such codes, which arguably improves over the best known existing bound, in some parameter regimes.

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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