Date Added: Dec 2010
Spectrum sensing receives much attention recently in the Cognitive Radio (CR) network research, i.e., Secondary Users (SUs) constantly monitor channel condition to detect the presence of the Primary Users (PUs). In this paper, the authors go beyond spectrum sensing and introduce the PU separation problem, which concerns with the issues of distinguishing and characterizing PUs in the context of collaborative spectrum sensing and monitor selection. The observations of monitors are modeled as boolean OR mixtures of underlying binary sources for PUs. They first justify the use of the binary OR mixture model as opposed to the traditional linear mixture model through simulation studies.