Greedy Signal Space Methods for incoherence and beyond


ABSTRACT. Compressive sampling (CoSa) has providedmany methods for signal recovery of signals compressible with respect to an orthonormal basis. However, modern applications have sparked the emergence of approaches for signals not sparse in an orthonormal basis but in some arbitrary, perhaps highly overcomplete, dictionary. Recently, several “signal-space” greedymethods have been proposed to address signal recovery in this setting. However, suchmethods inherently rely on the existence of fast and accurate projections which allow one to identify the most relevant atoms in a dictionary for any given signal, up to a very strict accuracy. When the dictionary is highly overcomplete, no such projections are currently known; the requirements on such projections do not even hold for incoherent or well-behaved dictionaries. In this work, we provide an alternate analysis for signal space greedy methods which enforce assumptions on these projections which hold in several settings including those when the dictionary is incoherent or structurally coherent. These results align more closely with traditional results in the standard CoSa literature and improve upon previous work in the signal space setting.

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@article{Giryes2013GreedySS, title={Greedy Signal Space Methods for incoherence and beyond}, author={Raja Giryes and Deanna Needell}, journal={CoRR}, year={2013}, volume={abs/1309.2676} }