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arXiv 1907.01289cs.ITmath.COmath.IT
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秩度量码的列表可译码性

On the list decodability of Rank Metric codes

Rocco Trombetti, Ferdinando Zullo

摘要:

令$k,n,m \in \mathbb{Z}^+$为整数,使得$k\leq n \leq m$,令$\mathrm{G}_{n,k}\in \mathbb{F}_{q^m}^n$为Delsarte-Gabidulin码。Wachter-Zeh证明,如果$τ$足够大,则对于任何半径的$τ$,都不能有效地对属于这个家族的代码进行列表解码。这一成果实质上依赖于证明$\mathbb{F}_{q^m}^n \setminus \mathrm{G}_{n,k}$中某些特定单词的列表大小的下界。在2016年,Raviv和Wachter-Zeh在特殊情况下改进了这个界限,即当$n\mid m$。因此,他们能够检测到根本无法有效列表解码的Delsarte-Gabidulin码的无限族。在这篇文章中,我们确定了类似的最大秩距离码的下界属于更广泛的一类例子,包括广义Gabidulin码,广义扭曲Gabidulin码,以及第一作者和岳舟最近描述的例子。通过利用参数,如在上述文件中使用的,当$n\mid m$,我们还显示了无限的家庭的广义Gabidulin码,不能列表解码效率在任何半径大于或等于$\left\lfloor \frac{d-1}2 \right\rfloor+1$,其中$d$是它的最小距离。尽管如此,在属于上述类别的所有其他示例中,我们检测在大于或等于$\left\lfloor \frac{d-1}2 \right\rfloor+2$的任何半径处不能被有效列表解码的无限族,其中$d$是其最小距离。最后,依靠最近由McGuire和Mueller提出的一组子空间三项式的性质,我们能够证明,任何秩度量码的$\mathbb{F}_{q^m}^n$的顺序$q^{kn}$与$n$除$m$,使得$4n-3$是一个正方形的$\mathbb{Z}$和包含$\mathrm{G}_{n,2}$,是不能有效地列表解码的半径$τ$的某些值。

英文摘要:

Let $k,n,m \in \mathbb{Z}^+$ integers such that $k\leq n \leq m$, let $\mathrm{G}_{n,k}\in \mathbb{F}_{q^m}^n$ be a Delsarte-Gabidulin code. Wachter-Zeh proven that codes belonging to this family cannot be efficiently list decoded for any radius $τ$, providing $τ$ is large enough. This achievement essentially relies on proving a lower bound for the list size of some specific words in $\mathbb{F}_{q^m}^n \setminus \mathrm{G}_{n,k}$. In 2016, Raviv and Wachter-Zeh improved this bound in a special case, i.e. when $n\mid m$. As a consequence, they were able to detect infinite families of Delsarte-Gabidulin codes that cannot be efficiently list decoded at all. In this article we determine similar lower bounds for Maximum Rank Distance codes belonging to a wider class of examples, containing Generalized Gabidulin codes, Generalized Twisted Gabidulin codes, and examples recently described by the first author and Yue Zhou. By exploiting arguments suchlike those used in the above mentioned papers, when $n\mid m$, we also show infinite families of generalized Gabidulin codes that cannot be list decoded efficiently at any radius greater than or equal to $\left\lfloor \frac{d-1}2 \right\rfloor+1$, where $d$ is its minimum distance. Nonetheless, in all other examples belonging to above mentioned class, we detect infinite families that cannot be list decoded efficiently at any radius greater than or equal to $\left\lfloor \frac{d-1}2 \right\rfloor+2$, where $d$ is its minimum distance. Finally, relying on the properties of a set of subspace trinomials recently presented by McGuire and Mueller, we are able to prove that any rank metric code of $\mathbb{F}_{q^m}^n$ of order $q^{kn}$ with $n$ dividing $m$, such that $4n-3$ is a square in $\mathbb{Z}$ and containing $\mathrm{G}_{n,2}$, is not efficiently list decodable at some values of the radius $τ$.

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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