Bisparse blind deconvolution through hierarchical sparse recovery

Abstract

The hierarchical sparsity framework , and in particular the HiHTP algorithm(Hierarchical Hard Thresholding Pursuit), has been successfully applied to many relevant communication engineering problems recently, particularly when the signal space is hierarchically structured. In this paper, the applicability of the HiHTP algorithm for solving the bi-sparse blind deconvolution problem is studied. The bi-sparse blind deconvolution setting here consists of recovering hand bfrom the knowledge of h∗(Qb), where Qis some linear operator, and both band hare assumed to be sparse. The approach rests upon lifting the problem to a linear one, and then applying HiHTP, through the hierarchical sparsity framework . Then, for a Gaussian draw of the random matrix Q, it is theoretically shown that an s-sparse h∈Kμand σ-sparse b∈Knwith high probability can be recovered when μ≳slog(s)2log(μ)log(μn)+sσlog(n).