Robust Cooperative Spectrum Sensing Method in Cognitive Radio Networks
Cooperation can improve the performance of spectrum sensing by taking advantage of diversity gains.However,in the process of cooperative spectrum sensing,malicious users could send false local sensing results to the fusion center,which can cause severe distortion of the final sensing decision.To improve the immunity of cooperative spectrum sensing against false sensing information,we propose a robust cooperative spectrum sensing scheme which is based on weighted sequential probability ratio test(WSPRT) technology.Through reputation maintenance,weight allocation and multithreaded detection,the proposed scheme can identify and weed out malicious users accurately and quickly,which improves the robostness of cooperative spectrum sensing.