A Novel Cooperative Spectrum Sensing Algorithm in Cognitive Radio Systems

摘要

In cognitive radio systems, unlicensed users can use the frequency bands when the licensed users are not present. Hence reliable detection of available spectrum is the foundation of cognitive radio technology. To ensure that the unimpaired operation of licensed users and to improve the spectrum sensing performance, a novel cooperative spectrum sensing algorithm based on credibility is proposed. In particular, the close-form expressions for the probability of the detection and the false-alarm is derived for the novel algorithm, and the expression for the average overhead used for cooperation is given in the performance analysis. The conclusion is proved by computer simulations.