Robust Cooperative Spectrum Sensing Based on STBC Scheme

Cooperative spectrum sensing aims to alleviate the influence of the severe fading or shadowing to the detection channels in cognitive radio systems. Based on the analysis of the space-time block coding (STBC) based fixed clustering cooperative spectrum sensing scheme, this paper proposes a robust dynamic clustering scheme to overcome the limitations of the fixed clustering scheme. The proposed scheme can take advantage of STBC scheme and improve the system sensing performance. It utilizes the conditions of inter-user channels to realize the dynamic clustering and achieves the lower bound of false alarm probability. Theoretical analysis and simulation results show that the proposed scheme improves the system sensing performance significantly over fading channels.