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arXiv 1104.1071cs.ITmath.IT
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使用块RIP分析块OMP

Analysis of Block OMP using Block RIP

Jun Wang, Gang Li, Hao Zhang, Xiqin Wang

摘要:

正交匹配追踪(OMP)是一种经典的稀疏信号重构贪心算法。当感兴趣的信号是块稀疏时,即,它具有出现在簇中的非零系数,OMP算法的块版本(即,块OMP)优于常规OMP。在本文中,我们证明了一个新的概念,块限制等距属性(块RIP),这是不严格的比标准的限制等距属性(RIP),可以用于一个非常简单的分析块OMP。它表明,块OMP可以准确地恢复任何块K-稀疏信号在不超过K步,如果块RIP的阶K+1与一个足够小的等距常数满足。利用这一结果可以证明,当信号是块稀疏时,块OMP可以产生比传统OMP更好的重建性能。

英文摘要:

Orthogonal matching pursuit (OMP) is a canonical greedy algorithm for sparse signal reconstruction. When the signal of interest is block sparse, i.e., it has nonzero coefficients occurring in clusters, the block version of OMP algorithm (i.e., Block OMP) outperforms the conventional OMP. In this paper, we demonstrate that a new notion of block restricted isometry property (Block RIP), which is less stringent than standard restricted isometry property (RIP), can be used for a very straightforward analysis of Block OMP. It is demonstrated that Block OMP can exactly recover any block K-sparse signal in no more than K steps if the Block RIP of order K+1 with a sufficiently small isometry constant is satisfied. Using this result it can be proved that Block OMP can yield better reconstruction properties than the conventional OMP when the signal is block sparse.

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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