Spectrum sharing scheme for hybrid satellite-terrestrial networks with interference constraints over Shadowed-Rician fading

Satellite-terrestrial spectrum sharing can effectively alleviate the scarcity of spectrum resources, which is a widely concerned issue in the academic community, and thus have received great attention. In this paper, considering the delay-limited transmission mode, we investigate a hybrid satellite-terrestrial network and propose a spectrum sharing scheme to increase the spectrum efficiency by sharing spectrum resources both between various networks on the condition of interference constraints and within one network by enabling non-orthogonal multiple access. The feasibility of spectrum sharing is first analyzed, which is also the theoretical foundation of our proposed scheme. Afterwards, by employing the Shadowed-Rician fading, we evaluate its performance, while realistically taking the mutual interferences between terrestrial and satellite networks into consideration. In addition, these theoretical derivation results are used for power allocation to maximize the system throughput by tedious algebraic operations. Finally, we validate the superiority of our proposed spectrum sharing scheme and the proposed power allocation method through numerical simulation.