Joint optimal sensing time and number of cooperative users in OR-RULE cooperative spectrum sensing

In this paper, optimization of the sensing time and the number of cooperative users for OR-Rule cooperative spectrum sensing in cognitive radio network is investigated. A cognitive network with multiple users and one fusion centre is considered. The frame structure of cooperative spectrum sensing is proposed, which is divided into multiple transmission slots and one sensing slot including local energy detection and cooperative overhead. By selecting the optimal sensing time and number of cooperative users, an optimization problem is formulated, which seeks to maximize the throughput of cognitive radio subject to the constraints of both the false alarm probability and the detection probability. A joint optimization algorithm is also proposed to solve this optimization problem. The simulation results show that the significant improvement on the throughput of cognitive radio can be achieved through the proposed joint optimization algorithm.