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Sufficient condition for exact support recovery of sparse signals through greedy block coordinate descent

机译:通过贪婪块坐标下降来精确支持稀疏信号恢复的充分条件

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摘要

In the underdetermined model ${i {hat Y}} = {i AX} + {i N}$Y=AX+N, where ${i X}$X is a K-group sparse matrix (i.e. it has no more than K non-zero rows), the matrix ${i A}$A may be also perturbed. Theoretically, a more relaxed condition means that fewer measurements are required to ensure sparse recovery. In this study, a relaxed sufficient condition is proposed for greedy block coordinate descent (GBCD) under total perturbations based on the restricted isometry property in order to guarantee that the support of ${i X}$X is recovered. We also show that GBCD fails in a more general case when $1/lpar sqrt {K + 1} par le delta _{K + 1} lt 1$1/(K+1)<=delta K+1 < 1.
机译:在欠定模型中,$ { bi { hat Y}} = { bi AX} + { bi N} $ Y = AX + N,其中$ { bi X} $ X是K组稀疏矩阵(也就是说,它有不超过K个非零行),矩阵$ { bi A} $ A也可能受到干扰。从理论上讲,更宽松的条件意味着需要较少的测量来确保稀疏的恢复。在这项研究中,提出了一个宽松的充分条件,用于基于受限等距性质的总扰动下的贪婪块坐标下降(GBCD),以确保收回$ { bi X} $ X的支持。我们还表明,当$ 1 / lpar sqrt {K + 1} rpar le delta _ {K + 1} lt 1 $ 1 /(K + 1)<= delta K +时,GBCD在更一般的情况下会失败。 1 <1。

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