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arXiv 2201.00344cs.ITmath.IT
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LRC最小域长的一个界及达到它的循环MR码

A Bound on the Minimal Field Size of LRCs, and Cyclic MR Codes That Attain It

Han Cai, Moshe Schwartz

摘要:

证明了局部可修码域大小的一个新下界。此外,我们还构造了循环的最大可恢复(MR)码。虽然MR码的已知构造具有相同的参数,但它产生非循环码。此外,我们证明了必要条件和充分条件,指定当已知的非循环MR码可以置换成为循环,从而证明我们的建设产生循环MR码与新的参数。此外,使用我们的新的界的字段大小,我们表明,新的循环MR码有最佳的字段大小在某些情况下。其他已知的LRC也被证明在某些情况下具有最佳的字段大小。

英文摘要:

We prove a new lower bound on the field size of locally repairable codes (LRCs). Additionally, we construct maximally recoverable (MR) codes which are cyclic. While a known construction for MR codes has the same parameters, it produces non-cyclic codes. Furthermore, we prove both necessary conditions and sufficient conditions that specify when the known non-cyclic MR codes may be permuted to become cyclic, thus proving our construction produces cyclic MR codes with new parameters. Furthermore, using our new bound on the field size, we show that the new cyclic MR codes have optimal field size in certain cases. Other known LRCs are also shown to have optimal field size in certain cases.

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