Trusted cooperative spectrum sensing scheme based on D-S evidence theory

Cooperative spectrum sensing (CSS) has being considered as a powerful approach to improve the utilization of scarce radio spectrum resources. However, most of CSS schemes receive all sensing data without filtering in the process of data fusion, and thus offering opportunities for malicious users. By launching the spectrum sensing data falsification attack (SSDF attack), malicious users can make a well designed schemes useless. Aiming at the uncertainty behaviors of cognitive users (CU), a trust scheme based on D-S evidence theory is proposed to guard the data fusion process for CSS. The simulation results show that our trust scheme is effective in suppressing SSDF attack, and thus ensuring the better sensing performance of CSS.