Centralized and Distributed Spectrum Sensing System Models Performance Analysis Based on Three Users

On the condition of scarce spectrum resources, the cognitive radio, as the next generation of radio technology, has incomparable superiority. Cooperative spectrum sensing cognitive radio has two kinds of systems: the centralized system and the distributed system. In this paper, we propose the centralized and the distributed spectrum sensing system models based on three users. The theoretical derivation and analysis about two models are conducted. Moreover, we simulate and compare the performance of two models. Simulation results show that when the report error probability is small, the overall performance of distributed spectrum sensing is superior to a centralized spectrum sensing, but the distributed cooperative spectrum sensing in the structure is more complex.