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arXiv 2005.11732cs.ITmath.IT
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关于自对偶广义Reed-Solomon码的注记

A Note on Self-Dual Generalized Reed-Solomon Codes

Weijun Fang, Jun Zhang, Shu-Tao Xia1, Fang-Wei Fu

摘要:

一个线性码被称为MDS自对偶码,如果它是MDS码和关于欧几里德内积的自对偶码。这种码的参数完全由码长决定。本文利用广义Reed-Solomon(GRS)码及其扩展码构造了MDS自对偶码。我们构造的关键思想是选择合适的求值点,使得相应的(扩展的)GRS码是自对偶的。我们构造的评价集是由有限域的一个子群和它在一个更大子群中的陪集组成的。得到了四类新的MDS自对偶码,它们在一定范围内具有比以往结果更好的参数。此外,利用有限域上的Mobius作用,我们给出了一个系统的方法来构造具有不同求值点的自对偶GRS码,只要是已知的自对偶GRS码。特别地,我们证明了所有长度为$n< q+1$的$\mathbb{F}_{q}$上的自对偶扩展GRS码都可以由具有相同参数的GRS码构造.

英文摘要:

A linear code is called an MDS self-dual code if it is both an MDS code and a self-dual code with respect to the Euclidean inner product. The parameters of such codes are completely determined by the code length. In this paper, we consider new constructions of MDS self-dual codes via generalized Reed-Solomon (GRS) codes and their extended codes. The critical idea of our constructions is to choose suitable evaluation points such that the corresponding (extended) GRS codes are self-dual. The evaluation set of our constructions is consists of a subgroup of finite fields and its cosets in a bigger subgroup. Four new families of MDS self-dual codes are obtained and they have better parameters than previous results in certain region. Moreover, by the Mobius action over finite fields, we give a systematic way to construct self-dual GRS codes with different evaluation points provided any known self-dual GRS codes. Specially, we prove that all the self-dual extended GRS codes over $\mathbb{F}_{q}$ with length $n< q+1$ can be constructed from GRS codes with the same parameters.

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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