Analytical performance of cooperative censored energy detection based “two witnesses rule” for cognitive radio networks

Cooperative spectrum sensing is a promising detection strategy that enhances the reliability of the decision made about the spectrum availability in cognitive radio networks. In order to exploit the diversity gained from the cooperation of the secondary users, fusion rules should be defined to derive a final decision. In this paper, analytical performance of a novel fusion rule is proposed. The proposed rule aims at reducing the risk of generating harmful interference to the primary system as well as enhancing the credibility of the secondary base station when declaring a sub-channel available. Analytical expressions of the probabilities of detection, false alarm, mis-detection and occupancy are derived and verified by simulations.