Spectrum Allocation Scheme Based on Stable Matching in Hierarchical Cognitive Satellite Network

Aiming at the problem that the number of users and available bandwidth of the current satellite service are increasing significantly, and the spectrum utilization rate of the existing spectrum allocation scheme is low, this paper first establishes a space-earth integrated spectrum resource sharing model, and analyzes the scenario of using the idle spectrum of the ground network to recognize the satellite downlink. Furthermore, a spectrum allocation algorithm based on stable matching is proposed for cognitive satellite network. According to the transmission characteristics of satellite communication, utility functions of cognitive satellite are given. Users can form stable matching between PUs and SUs through independent negotiation. The spectrum allocation algorithm proposed in this paper has low complexity and can adapt to dynamic networks. Experiments show that the proposed algorithm is superior to greedy matching and random matching in utility value, average sum rate, throughput and spectrum utilization ratio, so as to effectively allocate satellite spectrum.