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arXiv 1706.09615cs.ITmath.IT
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任意先验支持信息下加权$\ell_2/\ell_1$最小化的信号恢复

Recovery of signals by a weighted $\ell_2/\ell_1$ minimization under arbitrary prior support information

Wengu Chen, Huanmin Ge

摘要:

在本文中,我们引入了一个加权的$\ell_2/\ell_1$最小化恢复块稀疏信号与任意先验支持信息。在部分先验信息可用的情况下,基于高阶块RIP,给出了一个保证加权$\ell_2/\ell_1$最小化算法稳定鲁棒恢复块稀疏信号的充分条件.然后,我们表明,如果任意先验块支持估计的准确性至少是$50\%$,充分恢复条件的加权$\ell_2/\ell_{1}$最小化是弱于由$\ell_2/\ell_{1}$最小化,和加权$\ell_2/\ell_{1}$最小化提供更好的上界的测量噪声和信号的可压缩性方面的恢复误差。此外,我们通过大量的数值实验说明了加权$\ell_2/\ell_1$最小化方法在均匀和非均匀先验信息下块稀疏信号恢复性能方面的优势。结果的意义在于,明确利用块稀疏信号的块稀疏性和部分支持信息,可以获得更好的恢复性能比处理的信号是在传统意义上,从而忽略了额外的结构和先验支持信息的问题。

英文摘要:

In this paper, we introduce a weighted $\ell_2/\ell_1$ minimization to recover block sparse signals with arbitrary prior support information. When partial prior support information is available, a sufficient condition based on the high order block RIP is derived to guarantee stable and robust recovery of block sparse signals via the weighted $\ell_2/\ell_1$ minimization. We then show if the accuracy of arbitrary prior block support estimate is at least $50\%$, the sufficient recovery condition by the weighted $\ell_2/\ell_{1}$ minimization is weaker than that by the $\ell_2/\ell_{1}$ minimization, and the weighted $\ell_2/\ell_{1}$ minimization provides better upper bounds on the recovery error in terms of the measurement noise and the compressibility of the signal. Moreover, we illustrate the advantages of the weighted $\ell_2/\ell_1$ minimization approach in the recovery performance of block sparse signals under uniform and non-uniform prior information by extensive numerical experiments. The significance of the results lies in the facts that making explicit use of block sparsity and partial support information of block sparse signals can achieve better recovery performance than handling the signals as being in the conventional sense, thereby ignoring the additional structure and prior support information in the problem.

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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