A sensing time saving cluster-based cooperative spectrum sensing scheme

In a cognitive radio network, the cluster-based cooperative spectrum sensing scheme can achieve high detection accuracy when the reporting and inter-user channels both experience fading. However, due to the secondary user selected as the cluster head has to process large number of data from its entire cluster members, the traditional cluster-based scheme consumes too much time and faces the inefficient problem. A sensing time saving cluster-based (STSC) cooperative spectrum sensing scheme is proposed to resolve this problem faced by the traditional cluster-based cooperative sensing scheme. The proposed scheme selects the second user with high reliable sensing result as the cluster member and employs the sequential test in both the cluster head and the fusion center. Both the theory and the simulation results show that with the same target false alarm probability and missing detection probability the sensing time of the proposed scheme can be reduced 88.5% at most compared to the traditional cluster-based cooperative sensing scheme.