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arXiv 1102.0522cs.ITmath.IT
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一般信号集对的不确定关系与稀疏信号恢复

Uncertainty Relations and Sparse Signal Recovery for Pairs of General Signal Sets

Patrick Kuppinger, Giuseppe Durisi, Helmut Bölcskei

摘要:

我们提出了一个不确定性关系表示的信号在两个不同的一般(可能是冗余或不完整的)信号集。这种不确定性关系是相关的分析信号包含两个不同的功能,其中每一个可以描述稀疏在一个合适的一般信号集。此外,新的不确定性关系,导致改善稀疏阈值恢复的信号稀疏在一般字典。具体来说,我们的研究结果提高了著名的$(1+1/d)/2$阈值的字典一致性$d$的一个因素。此外,我们提供了概率恢复保证对一般字典,也使我们能够了解一个一般字典的哪些部分需要随机化,以“淘汰”的稀疏模式,禁止打破平方根瓶颈。

英文摘要:

We present an uncertainty relation for the representation of signals in two different general (possibly redundant or incomplete) signal sets. This uncertainty relation is relevant for the analysis of signals containing two distinct features each of which can be described sparsely in a suitable general signal set. Furthermore, the new uncertainty relation is shown to lead to improved sparsity thresholds for recovery of signals that are sparse in general dictionaries. Specifically, our results improve on the well-known $(1+1/d)/2$-threshold for dictionaries with coherence $d$ by up to a factor of two. Furthermore, we provide probabilistic recovery guarantees for pairs of general dictionaries that also allow us to understand which parts of a general dictionary one needs to randomize over to "weed out" the sparsity patterns that prohibit breaking the square-root bottleneck.

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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