Abstract:

An optimal decision threshold for energy detection based broadband is presented. Upon the analysis and research on whether the certain performance spectrum detection algorithm can achieve the target requirements, it is concluded that the threshold settings depended on the impact of false alarm probability and the probability of missing detection. Through mathematical derivation, the closed-formsolution of the minimum-cost decision threshold is deduced, and then the selection criterion of the optimal detection threshold is proposed in which the detection threshold selection is upon the length of observation time in domain. Simulation results verify the correctness of the article.

Key words: optimal decision threshold, observation time, energy detection