Energy-efficient analysis of cooperative spectrum sensing in CRN

Cognitive radio is a promising technology to solve the shortage of spectrum resource. As sensing nodes of the network, secondary users are usually battery powered. Making full use of the energy should also be considered while designing the network. In this paper, we consider the overall throughput of the system and energy consumption. We propose a model of throughput and energy consumption to discuss the influences of sensing time and number of secondary users, and analyze the existence of an optimal point which gets the maximum value of energy efficiency. Simulation results show that there is always the optimal point in different fusion rules. Cognitive radio network design based on energy efficiency consideration is feasible.