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Improved Performance Guarantees for Orthogonal Matching Pursuit and Application to Dimensionality Reduction
M. Sonkar, L. Tiwari,
Published in Springer Science and Business Media Deutschland GmbH
2021
Volume: 796
   
Pages: 223 - 234
Abstract
In Compressed Sensing (CS), Orthogonal Matching Pursuit (OMP) is a popular solver for recovering the sparse solution of an underdetermined system. The performance guarantees of OMP involving coherence-based arguments are known to be pessimistic. The present work aims at improving the performance guarantees via preconditioning. Since the systems Ax = y and GAx = Gy have the same set of solutions, both analytically and numerically, for an invertible and well-conditioned matrix G, while singling out the conditions, we determine G via a convex optimization problem in such a way that the performance guarantees of OMP get improved. Alongside the proof of concept, we demonstrate the implications of proposed improved bound towards dimensionality reduction by considering the reconstruction of a signal from a small set of its linearly projected samples. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
About the journal
JournalData powered by TypesetLecture Notes in Electrical Engineering
PublisherData powered by TypesetSpringer Science and Business Media Deutschland GmbH
ISSN18761100