Cooperative Spectrum Sensing Using Enhanced Dempster-Shafer Theory of Evidence in Cognitive Radio

摘要

Cooperative is an appropriate method for improving the performance of spectrum sensing when cognitive radio system is under the deep shadowing and fading environment. The Dempster-Shafer theory of evidence for fusion has similar reasoning logic with human. Thus an enhanced scheme for cooperative spectrum sensing based on an enhanced Dempster-Shafer Theory of Evidence is proposed in this paper. Our scheme utilizes the signal to noise ratios to evaluate the degree of reliability of each local spectrum sensing terminal on a distributed Cognitive Radio network to adjust the sensing data more accuratly before making fusion by Dempter-Shafer theory of evidence. Simulation results show that significant improvement of the cooperative spectrum sensing gain is achieved.