Tight Performance Bounds for Compressed Sensing With Conventional and Group Sparsity

Ranjan, Shashank and Vidyasagar, Mathukumalli (2019) Tight Performance Bounds for Compressed Sensing With Conventional and Group Sparsity. IEEE Transactions on Signal Processing, 67 (11). pp. 2854-2867. ISSN 1053-587X

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In this paper, we study the problem of recovering a group sparse vector from a small number of linear measurements. In the past, the common approach has been to use various 'group sparsity-inducing' norms such as the Group LASSO norm for this purpose. By using the theory of convex relaxations, we show that it is also possible to use ℓ 1 -norm minimization for group sparse recovery. We introduce a new concept called group robust null space property (GRNSP), and show that, under suitable conditions, a group version of the restricted isometry property (GRIP) implies the GRNSP, and thus leads to group sparse recovery. When all groups are of equal size, our bounds are sometimes less conservative than known bounds. Moreover, our results apply even to situations where the groups have different sizes. When specialized to conventional sparsity, our bounds reduce to one of the well-known 'best possible' conditions for sparse recovery. This relationship between GRNSP and GRIP is new even for conventional sparsity, and substantially streamlines the proofs of some known results. Using this relationship, we derive bounds on the ℓ p -norm of the residual error vector for all p ϵ [1,2], and not just when p = 2. When the measurement matrix consists of random samples of a sub-Gaussian random variable, we present bounds on the number of measurements, which are sometimes less conservative than currently known bounds.

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Item Type: Article
Uncontrolled Keywords: Compressed sensing, convex functions, optimization
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 20 May 2019 07:00
Last Modified: 20 May 2019 07:00
URI: http://raiith.iith.ac.in/id/eprint/5243
Publisher URL: http://doi.org/10.1109/TSP.2019.2907228
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