Optimization of Cooperative Spectrum Sensing under AWGN and Rayleigh Channels in Cognitive Radio Network

This paper deals with cooperative spectrum sensing (CSS) under AWGN and Rayleigh channels with energy detection as sensing technique for cognitive radio network (CRN). The performance of m-out-of-N voting rule, OR fusion logic and AND fusion logic rules under varying threshold is studied, appropriate range of thresholds over which particular fusion rule can be applied has been investigated. An optimum voting rule has been used for AWGN and Rayleigh channels with an aim to improve the performance for real time implementation. A generalized optimal voting rule is derived to minimize the number of cognitive radios (CRs) required to meet target error bound. Simulations are performed for both the channels and the results are found to be comparable with the analytical results. It is observed that 2CRs for Rayleigh channel and 5 CRs for AWGN channel gives minimum error in a CRN of 10 CRs.