关键词: 认知无线电, 协作频谱感知, 认知传感器网络, 能耗

Abstract: In cooperative spectrum sensing, each secondary user’s sensing performance is affected in different degrees when the channel experiences fading and shadow. Some severely affected cognitive users may even reduce the entire sensing performance of the cognitive sensor networks seriously. At the same time, the more the number of users involved in cooperation, the larger problems that cognitive sensor networks should face. To solve these problems, a cooperative spectrum sensing algorithm based on energy consumption is proposed. The algorithm introduces the LEACH protocol based on the node energy dissipation. All the nodes of the cognitive sensor network are divided into a number of clusters in clustering algorithm. And within each cluster, a utility function is constructed to decide the optimal number of cooperative users and choose the users involved in collaboration by taking into account the detection performance and energy consumption. So that detection performance and energy consumption in each cluster can achieve a good compromise. Informations received from cluster heads are fused to obtain the final decision applying OR rule in the sink. Simulation results show that the cooperative spectrum sensing algorithm with energy consumption can effectively prolong the survival time of cognitive sensor networks, reduce energy consumption of networks and ensure a good detection performance.

Key words: cognitive radio, cooperative spectrum sensing, cognitive sensor network, energy consumption