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arXiv 2112.02569cs.ITmath.IT
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最优四元$(r,δ)$ -局部可恢复码的结构和完全分类

Optimal quaternary $(r,δ)$-Locally Recoverable Codes: Their Structures and Complete Classification

Li Xu, Zhengchun Zhou, Jun Zhang, Sihem Mesnager

摘要:

针对多个节点并发故障时的数据恢复问题,将具有局部性$r$的线性$r$-LRC码扩展为具有局部性$(r, δ)$的$(r, δ)$-LRC码,使其能够在多个节点故障的情况下实现故障节点的局部恢复.最优LRC码是指其参数达到广义Singleton界且具有相等性的码。在本文中,我们感兴趣的是研究最佳LRC码在小域上,更准确地说,在$\mathbb{F}_4$。我们将采用一种方法,通过研究最佳的四元$(r,δ)$ -LRC码,通过他们的奇偶校验矩阵。我们的研究包括确定最佳的$(r,δ)$ -LRC码的结构特性,它们的构造,以及通过浏览所有可能的参数对$\F_4$的完全分类。我们强调,最佳四元$(r,δ)$ -LRC码的精确结构及其分类是通过奇偶校验矩阵方法使用证明技术获得的,该证明技术不同于Hao等人在[IEEE Trans. Inf. Theory,2020,66(12):7465-7474]中获得的最近用于最佳二进制和三进制$(r,δ)$ -LRC码的证明技术。

英文摘要:

Aiming to recover the data from several concurrent node failures, linear $r$-LRC codes with locality $r$ were extended into $(r, δ)$-LRC codes with locality $(r, δ)$ which can enable the local recovery of a failed node in case of more than one node failure. Optimal LRC codes are those whose parameters achieve the generalized Singleton bound with equality. In the present paper, we are interested in studying optimal LRC codes over small fields and, more precisely, over $\mathbb{F}_4$. We shall adopt an approach by investigating optimal quaternary $(r,δ)$-LRC codes through their parity-check matrices. Our study includes determining the structural properties of optimal $(r,δ)$-LRC codes, their constructions, and their complete classification over $\F_4$ by browsing all possible parameters. We emphasize that the precise structure of optimal quaternary $(r,δ)$-LRC codes and their classification are obtained via the parity-check matrix approach use proofs-techniques different from those used recently for optimal binary and ternary $(r,δ)$-LRC codes obtained by Hao et al. in [IEEE Trans. Inf. Theory, 2020, 66(12): 7465-7474].

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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