An enhanced cooperative spectrum sensing scheme based on evidence theory and reliability source evaluation in cognitive radio context

This letter proposes an enhanced scheme for cooperative spectrum sensing which utilizes the signal to noise ratios to evaluate the degree of reliability of each local spectrum sensing terminal on a distributed Cognitive Radio network. The terminals´ reliability weight is applied to adjust its sensing data more accurately before making fusion by Dempter-Shafer theory of evidence. Simulation results show that significant improvement of the cooperative spectrum sensing gain is achieved by our scheme.