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Sparse Recovery with Coherent Tight Frames via Analysis Dantzig Selector and Analysis LASSO

机译:通过分析Dantzig选择器的相干紧框架的稀疏恢复   和分析LassO

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摘要

This article considers recovery of signals that are sparse or approximatelysparse in terms of a (possibly) highly overcomplete and coherent tight framefrom undersampled data corrupted with additive noise. We show that the properlyconstrained $l_1$-analysis, called analysis Dantzig selector, stably recovers asignal which is nearly sparse in terms of a tight frame provided that themeasurement matrix satisfies a restricted isometry property adapted to thetight frame. As a special case, we consider the Gaussian noise. Further, undera sparsity scenario, with high probability, the recovery error from noisy datais within a log-like factor of the minimax risk over the class of vectors whichare at most $s$ sparse in terms of the tight frame. Similar results for theanalysis LASSO are showed. The above two algorithms provide guarantees only for noise that is bounded orbounded with high probability (for example, Gaussian noise). However, when theunderlying measurements are corrupted by sparse noise, these algorithms performsuboptimally. We demonstrate robust methods for reconstructing signals that arenearly sparse in terms of a tight frame in the presence of bounded noisecombined with sparse noise. The analysis in this paper is based on therestricted isometry property adapted to a tight frame, which is a naturalextension to the standard restricted isometry property.
机译:本文考虑了从(可能)高度过完整和相干的紧帧恢复稀疏或近似稀疏的信号,这些数据是由加性噪声破坏的欠采样数据造成的。我们表明,适当受限的$ l_1 $分析(称为分析Dantzig选择器)可以稳定地恢复信号,该信号在紧框架方面几乎是稀疏的,只要测量矩阵满足适合于紧框架的受限等距特性。作为一种特殊情况,我们考虑高斯噪声。此外,在稀疏情况下,从噪声数据中恢复的错误很有可能在矢量类的最小最大风险的对数因子之内,就紧帧而言,这些矢量最多为稀疏向量。 LASSO分析显示了相似的结果。以上两种算法仅对高概率有界或有界的噪声(例如高斯噪声)提供保证。但是,当基础测量因稀疏噪声而损坏时,这些算法将表现欠佳。我们展示了一种健壮的方法,用于在有界噪声与稀疏噪声相结合的情况下重建紧帧内几乎稀疏的信号。本文的分析基于适应于紧密框架的受限等距特性,这是对标准受限等距特性的自然扩展。

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  • 作者

    Lin, Junhong; Li, Song;

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  • 年度 2013
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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