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arXiv 1510.02499cs.ITmath.IT
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多拟阵理论在分布式存储系统中的应用

Applications of Polymatroid Theory to Distributed Storage Systems

Thomas Westerbäck, Ragnar Freij-Hollanti, Camilla Hollanti

摘要:

建立了多拟阵理论与局部可修码之间的联系。这里考虑的码是完全一般的,因为它们是$A^n$的子集,其中$A$是任意有限集。三类LRC被认为是,无论有和没有可用性,并为信息符号和所有符号的地方。将LRC的参数和类推广到多拟阵,并给出了这三类多拟阵和LRC的参数的广义Singelton界。这一结果推广了早期的Singleton型界限给出的LRC。达到这些界限的代码被称为完美的,而不是之前使用的更常见的术语“最优”,因为它们可能并不总是存在。最后,利用一类特殊的拟阵--伽玛拟阵,构造了新的完备线性LRC。拟阵,对于他们的一部分,形成一个子类的polymatroids和已被证明是有用的分析和构造线性LRC。

英文摘要:

In this paper, a link between polymatroid theory and locally repairable codes (LRCs) is established. The codes considered here are completely general in that they are subsets of $A^n$, where $A$ is an arbitrary finite set. Three classes of LRCs are considered, both with and without availability, and for both information-symbol and all-symbol locality. The parameters and classes of LRCs are generalized to polymatroids, and a general- ized Singelton bound on the parameters for these three classes of polymatroids and LRCs is given. This result generalizes the earlier Singleton-type bounds given for LRCs. Codes achieving these bounds are coined perfect, as opposed to the more common term optimal used earlier, since they might not always exist. Finally, new constructions of perfect linear LRCs are derived from gammoids, which are a special class of matroids. Matroids, for their part, form a subclass of polymatroids and have proven useful in analyzing and constructing linear LRCs.

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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