arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.11082eess.SPcs.ITmath.IT
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基于$q$比块约束最小奇异值的增强块稀疏信号恢复

Enhanced block sparse signal recovery based on $q$-ratio block constrained minimal singular values

Jianfeng Wang, Zhiyong Zhou, Jun Yu

摘要:

本文提出了块稀疏/压缩信号的压缩感知中测量矩阵的一种新的度量--$q$ -比块约束最小奇异值(BCMSV),并给出了计算这种新度量的算法。研究了基于$q$比BCMSV的块基追踪(BBP)、块Dantzig选择器(BDS)和群套索重建误差的混合$\ell_2/\ell_q$和混合$\ell_2/\ell_1$范数的稳定和鲁棒恢复。基于$q$ -比率块稀疏性建立了无噪声BBP精确恢复的充分条件,并提出了一个凸-凹过程来解决相应的非凸问题.此外,我们证明了次高斯随机矩阵,$q$比BCMSV是有界远离零的高概率时,测量的数量是合理的大。数值实验验证了理论结果。此外,我们证明了$q$比BCMSV为基础的误差界比块限制各向同性常数为基础的界限更紧。

英文摘要:

In this paper we introduce the $q$-ratio block constrained minimal singular values (BCMSV) as a new measure of measurement matrix in compressive sensing of block sparse/compressive signals and present an algorithm for computing this new measure. Both the mixed $\ell_2/\ell_q$ and the mixed $\ell_2/\ell_1$ norms of the reconstruction errors for stable and robust recovery using block Basis Pursuit (BBP), the block Dantzig selector (BDS) and the group lasso in terms of the $q$-ratio BCMSV are investigated. We establish a sufficient condition based on the $q$-ratio block sparsity for the exact recovery from the noise free BBP and developed a convex-concave procedure to solve the corresponding non-convex problem in the condition. Furthermore, we prove that for sub-Gaussian random matrices, the $q$-ratio BCMSV is bounded away from zero with high probability when the number of measurements is reasonably large. Numerical experiments are implemented to illustrate the theoretical results. In addition, we demonstrate that the $q$-ratio BCMSV based error bounds are tighter than the block restricted isotropic constant based bounds.

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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