Joint cooperative spectrum sensing and spectrum opportunity for satellite cluster communication networks

Satellite communication networks composed of various satellites with different heights can be regarded as cooperative primary users in the space segment. Cooperative spectrum sensing as the key techniques of cognitive radio has been paid more attention to the application of satellite communications. To fully explore the potentials of the mobile satellite communication networks based on the concept of satellite cluster in supporting of heterogeneous applications, a trust-weighted cooperative spectrum sensing to primary satellite system is proposed in this paper. And the proposed algorithm allows the fusion center to combine all the 1-bit local decisions from all the secondary satellite systems through trust weights, in order to obtain a final decision on the presence of the primary satellite system. Moreover, according to the spectrum dynamics and node mobility, we propose a spectrum opportunity-based routing protocol (SORP) in which the nodes can exploit the local information and find local available channel to provide reliable routing in cluster-based satellite networks. Specifically, a novel metric which is aware of the unique properties is introduced to select the cluster head of each cluster. Simulation results show the comparison of the efficiency of proposed cooperative spectrum sensing and protocol with a few other related works.