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arXiv 1104.4302cs.ITmath.ITstat.ML
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有限域上的秩最小化:基本极限和编码理论解释

Rank Minimization over Finite Fields: Fundamental Limits and Coding-Theoretic Interpretations

Vincent Y. F. Tan, Laura Balzano, Stark C. Draper

摘要:

本文给出了有限域低秩矩阵的信息论极限估计,给出了低秩矩阵的随机线性测度,这些线性测度是由低秩矩阵与随机感知矩阵的内积得到的。给出了所需测量次数的充要条件。结果表明,这些条件是尖锐的,最小秩解码器是渐近最优的。该解码器的可靠性函数也来自呼吁德卡昂的下界的概率联盟。当感测矩阵是稀疏的时,该充分条件也成立-这是可以服从有效解码的场景。更准确地说,它表明,如果n个\times n-传感矩阵包含,平均,Ω(nlog n)的条目,所需的测量的数量是相同的,当传感矩阵是密集的,并包含均匀随机抽取的字段的条目。上述结果与编码理论文献中的秩度量码进行了类比。事实上,我们也强烈的动机,了解最小秩距离解码的随机秩度量码成功。为此,我们推导出等概率和稀疏秩度量码的距离性质。这些距离属性提供了一个精确的几何解释的事实,稀疏的合奏需要尽可能少的测量密集的。最后,我们提供了一个非穷举的过程来搜索未知的低秩矩阵。

英文摘要:

This paper establishes information-theoretic limits in estimating a finite field low-rank matrix given random linear measurements of it. These linear measurements are obtained by taking inner products of the low-rank matrix with random sensing matrices. Necessary and sufficient conditions on the number of measurements required are provided. It is shown that these conditions are sharp and the minimum-rank decoder is asymptotically optimal. The reliability function of this decoder is also derived by appealing to de Caen's lower bound on the probability of a union. The sufficient condition also holds when the sensing matrices are sparse - a scenario that may be amenable to efficient decoding. More precisely, it is shown that if the n\times n-sensing matrices contain, on average, Ω(nlog n) entries, the number of measurements required is the same as that when the sensing matrices are dense and contain entries drawn uniformly at random from the field. Analogies are drawn between the above results and rank-metric codes in the coding theory literature. In fact, we are also strongly motivated by understanding when minimum rank distance decoding of random rank-metric codes succeeds. To this end, we derive distance properties of equiprobable and sparse rank-metric codes. These distance properties provide a precise geometric interpretation of the fact that the sparse ensemble requires as few measurements as the dense one. Finally, we provide a non-exhaustive procedure to search for the unknown low-rank matrix.

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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