A Cooperative Sensing Scheme for Cognitive Networks over Fading Channels

In this paper, we propose a new cooperative spectrum sensing scheme for cooperative energy detection, named multi-selective scheme. The proposed cooperative sensing scheme is based on order statistics of the reporting links between the cooperative nodes and fusion center where the links with high signal-to-noise ratios (SNRs) are selected as reliable reporting links. The performance of the proposed scheme is compared to other existing schemes in terms of the probability of detection and probability of false alarm over independent identical distributed (i.i.d.) Rayleigh fading channels. These reliable reporting links send their hard/local decisions to the fusion center where final decision is made using N-out-of-K rule. The performance of our proposed spectrum sensing scheme is evaluated using both analytical and simulation results where it shows a significant performance improvement in-terms of the probability of detection and false alarm compared with some other existing schemes.