A Kind of Cooperative Spectrum Sensing Technology Based on Data Fusion

Cognitive radio is a kind of intelligent and spectrum sharing technology for improving the utilization of spectrum. It is the key and precondition for detecting the presence of primary user and spectrum hole quickly and reliably. Due to shadowing and multi-path fading, single terminal detection is not so reliable. Cooperative spectrum sensing method based on data fusion can improve the sensing performance significantly for the primary user. Previous studies on cooperative sensing have focused on detection techniques using hard decision. In this paper, the equal gain combining based on data fusion is proposed. Computer simulation results indicate that the cooperative spectrum sensing by using equal gain combining outperform the method by using hard decision in fusion center.