I. Introduction
In the last decade compressive sensing (CS) and signal sparsity have attracted interest of many researchers, especially after ground-breaking papers [1], [2]. The application of the CS methods is not exclusive to the image reconstruction [3]–[6], and over the years it has been used in various fields: medicine [7], [8], astronomy [9], [10], wireless communication [11], [12], radar [13], [14], etc.