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arXiv 1101.4458cs.ITmath.IT
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正交匹配追踪算法中约束等距性的注记

Remarks on the Restricted Isometry Property in Orthogonal Matching Pursuit algorithm

Qun Mo, Yi Shen

摘要:

本文从理论上证明了如果压缩感知矩阵的约束等距常数$δ_K$满足$$ δ_{K+1} < \frac{1}{\sqrt{K}+1}, $$,则称为正交匹配追踪(OMP)的贪心算法可以在$K$迭代中恢复具有$K$非零元素的信号。相比之下,矩阵也构造有限制等距常数$$ δ_{K+1} = \frac{1}{\sqrt{K}} $$,使得OMP不能在$K$迭代中恢复$K$ -稀疏$x$。这一结果证明了Dai和Milenkovic的猜想是正确的。

英文摘要:

This paper demonstrates theoretically that if the restricted isometry constant $δ_K$ of the compressed sensing matrix satisfies $$ δ_{K+1} < \frac{1}{\sqrt{K}+1}, $$ then a greedy algorithm called Orthogonal Matching Pursuit (OMP) can recover a signal with $K$ nonzero entries in $K$ iterations. In contrast, matrices are also constructed with restricted isometry constant $$ δ_{K+1} = \frac{1}{\sqrt{K}} $$ such that OMP can not recover $K$-sparse $x$ in $K$ iterations. This result shows that the conjecture given by Dai and Milenkovic is ture.

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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