Abstract: In cognitive radio network,cooperative spectrum sensing technology overcomes the problems of multipath effects,shadow effects and such constraints by using local sensing results of cognitive users,hence improves the detection performance．This paper introduces the normal model of cooperative spectrum sensing,analyzes the local spectrum sensing and fusion decision these two key elements,shows the differences of ROC between local spectrum sensing and cooperative sensing．Then presents the concept,classification and state-of-the-art of research of spectrum sensing data falsification attack,we also analyzes and simulates for the possible case,simulation results show that the detection performance decline since be attacked．Finally,we summarize this paper.

Key words: Cognitive radio,Cooperative spectrum sensing,SSDF attack,Detection performance