cognitive radio-free research paper

FREE-DOWNLOAD X Wang, Z Li, P Xu, Y Xu… – Systems, Man, and …, 2010 –
Abstract—Cognitive radio is emerging as a promising technique to improve the utilization of the
radio frequency spectrum. In this paper, we consider the problem of spectrum sharing among
pri- mary (or “licensed”) users (PUs) and secondary (or “unlicensed”) users (SUs). We