On sub-Nyquist spectrum sensing for wideband cognitve radios

This paper presents a survey of the recently proposed sub-Nyquist spectrum sensing methods for wideband cognitive radio systems. Sub-Nyquist sensing aims at acquiring wideband signals at low rates offering a feasible realization of wideband cognitive radios using the off the shelf components. In this paper, the relevant scientific literature has been classified to three approaches. The first approach assumes a discrete multitoned signal model while the second assumes a continuous multiband signal model. The third approach adopts cooperation among spatially distributed cognitive radio devices. Finally, the pros and cons of each of these approaches are presented and discussed.