Performance Analysis of NOMA-based Satellite-Terrestrial Network with Adaptive Scheme under the Effect of Co-channel Interference

The non-orthogonal multiple access (NOMA)-based satellite-terrestrial network is a major research hotspot in communication. This paper proposes an adaptive power allocation scheme within a satellite-terrestrial communication system utilizing NOMA. The effectiveness of this scheme is rigorously validated through extensive simulations, which demonstrate its significant improvement in the system performance. Besides, the small-scale fading on the satellite-terrestrial links is modeled as the Nakagamim distribution, and the envelope of each interference link is represented as statistically independent exponentially distributed random variables. The closed-from expressions of channel capacity and outage probability for the system are derived. Furthermore, we investigate the influence of path loss, small-scale fading, and co-channel interference on the considered system.