A Research on the Spectrum Sensing Algorithm in the Cognitive Radio

Aiming at the disadvantages of the single node spectrum sensing detection that the detection threshold is susceptible to unknown noises, and the detection has a high requirement for bit synchronization as well as a relatively complex algorithm, the distributed limited cooperation detection formulas of "or" rule, "and" rule are derived. These formulas indicate that, on the basis of slight degradation in the false alarm performance, the detection performance under the low SNR (Signal to Noise Ratio) is greatly improved, and the detection performance of shadow fading node is enhanced, and the ability to resist fading shadows is strengthened, which is verified by the simulation results. In addition, the simulation results indicate that the cooperation mechanism can still effectively improve the spectrum sensing performance even when there are fewer number of cooperation nodes, thus demonstrating that the cooperative spectrum detection is an effective means to improve perception during the cognitive radio spectrum sensing process.