Optimization of cooperative spectrum sensing based on improved energy detector with selection diversity in AWGN and Rayleigh fading

摘要

In this paper, an optimized cooperative spectrum sensing (CSS) network, in which each cognitive radio (CR) uses multiple antennas and an improved energy detector is proposed. The performance is evaluated by optimizing the network parameters such as number of CR users and normalized detection threshold. We have derived the suitable expressions for optimum value of normalized threshold in Rayleigh fading channel for single and multiple antenna case and optimum number of CRs for both AWGN and Rayleigh fading channels. Finally, optimal values of number of CRs and normalized detection threshold is calculated for different values of average sensing channel SNR, normalized threshold, and multiple antennas at each CR. Comparison between conventional energy detector (CED) and improved energy detector (EED) is also provided.