Optimized dynamic threshold adjustment method for cooperative detection

Abstract

In this paper optimized spectrum detection method with dynamic threshold adjustment is proposed, to improve the spectrum efficiency of cooperative sensing and to reduce the system overhead. Based on single sensing node minimum error detection probability an expression for dynamic threshold under different channel environment is derived. Optimal sensing node number is obtained according to the constant detection and constant false alarm rate, and the system detection error probability is obtained by combining the optimal number of sensing nodes with the adaptive threshold. Simulation result shows that the proposed method can improve the detection probability and reduce the detection error probability.