Cognitive Radio Spectrum Sensing and Data Fusing Algorithm

In order to improve the sensing accuracy of free spectrum in cognitive radio system, different sensing strategies were proposed according to the regions where cognitive users located: cognitive users located at the edge of the primary user´s decoding region sense spectrum through part collaboration with its adjacent non-edge cognitive user; Cognitive users located at the non-edge region use multi-node cooperative sensing method. This paper proposes a data fusion algorithm based on index belief degree function. Theoretical analysis and simulation results show that the algorithm is much more improved than the existing technology in the detection performance, thus it enhances the spectrum utilization.