Coherence-based Partial Exact Recovery Condition for OMP/OLS

Abstract : We address the exact recovery of the support of a k-sparse vector with Orthogonal Matching Pursuit (OMP) and Orthogonal Least Squares (OLS) in a noiseless setting. We consider the scenario where OMP/OLS have selected good atoms during the first l iterations (l < k) and derive a new sufficient and worst-case necessary condition for their success in k steps. Our result is based on the coherence of the dictionary and relaxes Tropp's well-known condition < 1=(2k 1) to the case where OMP/OLS have a partial knowledge of the support.
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Contributor : Cédric Herzet <>
Submitted on : Friday, November 30, 2012 - 3:57:06 PM
Last modification on : Wednesday, December 19, 2018 - 3:02:04 PM
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  • HAL Id : hal-00759433, version 1


Cedric Herzet, Charles Soussen, Jérôme Idier, Rémi Gribonval. Coherence-based Partial Exact Recovery Condition for OMP/OLS. 2012. ⟨hal-00759433⟩



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