arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.09916cs.ITcs.SCmath.IT
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码在秩、子空间和秩和度量中的快速译码

Fast Decoding of Codes in the Rank, Subspace, and Sum-Rank Metric

Hannes Bartz, Thomas Jerkovits, Sven Puchinger, Johan Rosenkilde

摘要:

我们加快现有的解码算法的三个代码类在不同的度量:交织Gabidulin码的秩度量,解除交织Gabidulin码的子空间度量,和线性Reed-Solomon码的秩和度量。加速是通过新的算法实现的,这些算法将解码器的底层计算问题的核心减少到一个共同的工具:计算斜多项式环上的矩阵的左近似基和右近似基。为了实现这一点,我们描述了一个斜模拟现有的PM-基础算法的矩阵在普通多项式。这捕获了斜多项式乘法中的大部分工作,并且复杂性的好处来自于现有算法比经典的二次复杂性更快地执行此操作。各种解码相关的计算问题的新算法是有趣的,在自己的,并有进一步的应用,特别是部分解码器的其他几个代码和基本问题有关的斜多项式的矩阵估计。

英文摘要:

We speed up existing decoding algorithms for three code classes in different metrics: interleaved Gabidulin codes in the rank metric, lifted interleaved Gabidulin codes in the subspace metric, and linearized Reed-Solomon codes in the sum-rank metric. The speed-ups are achieved by new algorithms that reduce the cores of the underlying computational problems of the decoders to one common tool: computing left and right approximant bases of matrices over skew polynomial rings. To accomplish this, we describe a skew-analogue of the existing PM-Basis algorithm for matrices over ordinary polynomials. This captures the bulk of the work in multiplication of skew polynomials, and the complexity benefit comes from existing algorithms performing this faster than in classical quadratic complexity. The new algorithms for the various decoding-related computational problems are interesting in their own and have further applications, in particular parts of decoders of several other codes and foundational problems related to the remainder-evaluation of skew polynomials.

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