Recovery of Signals with Low Density

Christoph Studer

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arXiv · 1507.02821

Recovery of Signals with Low Density

Christoph Studer

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Abstract

Sparse signals (i.e., vectors with a small number of non-zero entries) build the foundation of most kernel (or nullspace) results, uncertainty relations, and recovery guarantees in the sparse signal-processing and compressive-sensing literature. In this report, we study a signal-density measure, the ratio between the $\ell_1$-norm and the $\ell_\infty$-norm of a vector, which extends the common notion of sparsity to non-sparse signals whose entries' magnitudes decay rapidly. By taking into account such magnitude information, we derive a kernel result and an uncertainty relation that are more general and less restrictive than those based on the $\ell_0$-pseudonorm. Furthermore, we use this density measure to analyze orthogonal matching pursuit (OMP). We show that OMP provably (i) recovers sparse signals with decaying magnitudes using up to 2$\boldsymbol\times$ more non-zero coefficients than guaranteed by standard, sparsity-based results and (ii) identifies the largest entries of arbitrary signals under a suitable magnitude-decay condition.

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Christoph Studer. 2015-07-10. Recovery of Signals with Low Density. https://arxiv.org/abs/1507.02821

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