Outage of Multi-Antenna NOMA-based Cooperative Underlay Satellite-Terrestrial Networks

This paper proposes a novel bi-directional non-orthogonal multiple access (NOMA)-based cooperative underlay satellite-terrestrial network (CUSTN), in which two secondary satellite users can serve as a potential relay for each user, thus gaining higher cooperative diversity order (DO). We analyze the exact and asymptotic outage probabilities (OPs) of both users under a multi-antenna setup and a practical residual hardware impairment (RHI) consideration. Numerical results are provided to validate the analysis, reveal the impacts of key parameters on the system performance, and demonstrate the advantages of our proposed scheme over other benchmarks.