Spectrum Efficiency Optimization for Terrestrial-Satellite Networks with Rate Splitting

The growing number of services and users leads to an increasing scarcity of spectrum resource and brings challenges to terrestrial-satellite networks (TSNs). For the limited spectrum resource and long-distance transmission characteristics, the improvement of spectrum efficiency is particularly important in TSNs. In this paper, we discuss the optimization problem of spectrum resource utilization in TSNs. By establishing a rate-split multiple-access and multiple-input-single-output (MISO) based terrestrial-satellite network architecture, a joint optimization scheme of user association, power and rate allocation is proposed. The objective of maximizing the system spectrum efficiency can be obtained, so as to realize the efficient utilization of spectrum resource while guaranteeing the communication requirements of users.