Performance Analysis for AWGN and Rayleigh Fading Channel under Different AND & OR Fusion Rules

Cognitive radio which is a buzzword in radio technology world. The main features of this CK having low cost communication, restrict the interference of the unlicensed users, able to fill voids in the wireless spectrum, increase the spectral efficiency, able to make final decision about primary user weather present or not. The advantage is that this technology allows the CR users to co-operate by sharing their information's for detecting the primary users. However, the accurate detection factor will be compromised if the users experience deep shadowing or fading effect. Hard decision (OR rule and AND-rule) is also performed at fusion centre (FC) in CR. The main motive of this project is to investigate performance of co-operative spectrum sensing scheme which is considered as the key technology in CR. Finally, this study will also show how to promote sensing performance in AWGN and Rayleigh fading channels. The performance of this CR is evaluated in terms of the probability of Pmd and the probability of Pfa. Then, the report is compared between the theoretical value and simulated result. After that it describes the relationship between (SNR) and the detections. At last, the method, energy detection and simulation and result are discussed.