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arXiv 1302.0490cs.ITmath.IT
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广义正交匹配追踪在RIP上的改进界

Improved Bounds on RIP for Generalized Orthogonal Matching Pursuit

Siddhartha Satpathi, Rajib Lochan Das, Mrityunjoy Chakraborty

摘要:

广义正交匹配追踪(gOMP)是OMP算法的自然扩展,其中与OMP不同,它可以在每次迭代中选择$N (\geq1)$原子。在本文中,我们证明了gOMP可以成功地重建一个$K$稀疏信号从一个压缩的测量$ {\bf y}={\bf Φx}$ $K^{th}$迭代,如果传感矩阵${\bf Φ}$满足限制等距性质(RIP)的顺序$NK$其中$δ_{NK} < \frac {\sqrt{N}}{\sqrt{K}+2\sqrt{N}}$。我们的界限提供了一个改进的非常近期的结果显示在\cite{wang_2012b}。此外,我们提出了另一个界的顺序$NK+1$与$δ_{NK+1} < \frac {\sqrt{N}}{\sqrt{K}+\sqrt{N}}$,它完全相关的OMP(N=1)的$δ_{K+1} < \frac {1}{\sqrt{K}+1}$的近最佳界的OMP(\cite{wang_2012a})。

英文摘要:

Generalized Orthogonal Matching Pursuit (gOMP) is a natural extension of OMP algorithm where unlike OMP, it may select $N (\geq1)$ atoms in each iteration. In this paper, we demonstrate that gOMP can successfully reconstruct a $K$-sparse signal from a compressed measurement $ {\bf y}={\bf Φx}$ by $K^{th}$ iteration if the sensing matrix ${\bf Φ}$ satisfies restricted isometry property (RIP) of order $NK$ where $δ_{NK} < \frac {\sqrt{N}}{\sqrt{K}+2\sqrt{N}}$. Our bound offers an improvement over the very recent result shown in \cite{wang_2012b}. Moreover, we present another bound for gOMP of order $NK+1$ with $δ_{NK+1} < \frac {\sqrt{N}}{\sqrt{K}+\sqrt{N}}$ which exactly relates to the near optimal bound of $δ_{K+1} < \frac {1}{\sqrt{K}+1}$ for OMP (N=1) as shown in \cite{wang_2012a}.

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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