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arXiv 1504.05073cs.ITmath.ITmath.STstat.TH
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RIP性质与稀疏恢复条件之间的差距

On the gap between RIP-properties and sparse recovery conditions

Sjoerd Dirksen, Guillaume Lecué, Holger Rauhut

摘要:

本文研究了利用$\ell_p$约束基追踪从欠定线性测量中恢复稀疏向量的问题。以前的分析,这个问题的基础上广义限制等距属性表明,两种现象发生,如果$p\neq 2$。首先,可能需要基本上多于$s \log(en/s)$的测量(对于$p=2$是最佳的)来均匀恢复所有$s$稀疏向量。第二,以最佳测量次数实现恢复的矩阵可能不是高斯的(对于$p=2$)。我们提出了一个新的,直接的分析表明,事实上,这两种现象都没有发生。通过一个合适的版本的零空间属性,我们表明,一个标准的高斯矩阵提供了$\ell_q/\ell_1$恢复保证$\ell_p$约束的基础上追求的最佳测量制度。我们的结果扩展到几个双尾测量矩阵。作为一个应用程序,我们表明,可以获得一致的重建均匀标量量化测量的最佳测量制度。

英文摘要:

We consider the problem of recovering sparse vectors from underdetermined linear measurements via $\ell_p$-constrained basis pursuit. Previous analyses of this problem based on generalized restricted isometry properties have suggested that two phenomena occur if $p\neq 2$. First, one may need substantially more than $s \log(en/s)$ measurements (optimal for $p=2$) for uniform recovery of all $s$-sparse vectors. Second, the matrix that achieves recovery with the optimal number of measurements may not be Gaussian (as for $p=2$). We present a new, direct analysis which shows that in fact neither of these phenomena occur. Via a suitable version of the null space property we show that a standard Gaussian matrix provides $\ell_q/\ell_1$-recovery guarantees for $\ell_p$-constrained basis pursuit in the optimal measurement regime. Our result extends to several heavier-tailed measurement matrices. As an application, we show that one can obtain a consistent reconstruction from uniform scalar quantized measurements in the optimal measurement regime.

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