Performance of NOMA-Based Downlink Satellite-Ground Network Under Nakagami-m Fading Distribution

In this paper, a system model composed a Satellite-Ground downlink network, using non-orthogonal multiple access strategy, serving ground NOMA users, with channels under Nakagami-m distribution is presented. In this scheme, employing NOMA technique over shadowed fading channels, signals emanating from the satellite to different users are multiplexed and the resulting signal is transmitted over the same channels. Whereas at the reception stage, successive interference cancellation algorithm (SIC) is executed to decode the desired signals. The effect of imperfect channel state information (CSI), characterized by relative channel estimation errors, has been taken into account, to evaluate outage performance, and ergodic sum rates, in the case of two randomly located NOMA ground users, by employing Nakagami-m distribution. This distribution, has the ability, to model a varied class of fading channel conditions, and is suitable to the experimental, better than other distributions. In addition, ergodic capacity performance is also analyzed, to reveal the effect of channel state information imperfectness, on this erformance of this systrem, in the case of two NOMA ground mobile users.