A robust STBC based dynamical clustering cooperative spectrum sensing scheme in CR systems

Cooperative spectrum sensing is employed to detect the primary user more accurately in cognitive radio systems. Since the non-ideal reporting channels between the base station and the cognitive users degrade the sensing performance, STBC based clustering scheme is adopted to deal with this problem. However, inter-user channels between cognitive users may also experience fading and decrease the sensing performance. In this paper, we propose a robust dynamically-clustered cooperative sensing scheme. The proposed scheme makes full use of the inter-user channel information and groups the cognitive users based on the quality of inter-user channel. Simulation results show that the proposed scheme improves the system sensing performance significantly.