Dynamic Threshold Cooperative Sensing Method Based on SNR

In cooperative frequency spectrum sensing,signal detection for single user will influence united detection performance a lot because of different environment.Aiming at the problem,according to the Signal-to-noise Ratio(SNR) of cognitive node,this paper proposes a new cooperative sensing method,which can dynamically adjust threshold.Simulation results illustrate that in the same false alarm probability,the method can significantly improve the united detection probability and reliability of frequency spectrum detection.