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arXiv 1506.04822cs.ITmath.IT
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局部可修码的一些改进

Some Improvements on Locally Repairable Codes

Jun Zhang, Xin Wang, Gennian Ge

摘要:

在分布式存储系统中引入局部可修复码(LRC)来有效地纠正擦除. LRC是近年来研究的热点。本文首先讨论了\cite{q}中的开集情形,并给出了LRC最小距离的一个改进的上界。我们也给出了一个明确的建设LRC达到这个界限。其次,我们考虑了任意位置和可用性的LRC的构造,这些LRC具有尽可能大的最小距离和尽可能高的码率。我们给出了一个图形模型的LRC。利用图论的深入结果,构造了一族具有任意局部性$r$和可用性$2$的LRC,其码率为$\frac{r-1}{r+1}$,最优最小距离为$O(\log n)$,其中$n$为码长.

英文摘要:

The locally repairable codes (LRCs) were introduced to correct erasures efficiently in distributed storage systems. LRCs are extensively studied recently. In this paper, we first deal with the open case remained in \cite{q} and derive an improved upper bound for the minimum distances of LRCs. We also give an explicit construction for LRCs attaining this bound. Secondly, we consider the constructions of LRCs with any locality and availability which have high code rate and minimum distance as large as possible. We give a graphical model for LRCs. By using the deep results from graph theory, we construct a family of LRCs with any locality $r$ and availability $2$ with code rate $\frac{r-1}{r+1}$ and optimal minimum distance $O(\log n)$ where $n$ is the length of the code.

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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