Outage Analysis of NOMA-Based Multiple-Antenna Hybrid Satellite-Terrestrial Relay Networks

Abstract — In this letter, the outage performance of a novel non-orthogonal multiple access (NOMA)-based hybrid satellite-terrestrial relay network (HSTRN) is analyzed, where the satellite can directly communicate with one user while communicating with the other user only through an amplify-and-forward (AF) multiple-antenna relay. Exact and asymptotic outage probabil- ities of both users are derived by considering both fixed gain (FG) and variable gain (VG) AF relaying protocols, along with practical imperfect successive interference cancellation (I-SIC).

Numerical results are provided to validate our analysis and unveil some useful engineering insights, such as the impacts of I-SIC, the number of antennas and the choice of relaying protocols on the system performance.

In dex Terms— Non-orthogonal multiple access, hybrid satellite- terrestrial relay networks, fixed gain, outage probability.

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