Abstract
In this paper, a downlink cooperative non-orthogonal multiple accesses (C-NOMA) system assisted with a decode and forward (DF) UAV-relay is developed, where the channel gains follow the K-mu generalized fading model to evaluate its system performance. The study involves two scenarios in which the NOMA signal is propagated through the outdoor-to-indoor channel and the outdoor-to-outdoor channels, where the practical successive interference cancellation (SIC) is addressed. In particular, exact closed-form expressions are derived for the outage probability (OP) of indoor-outdoor NOMA users on K-mu fading channels. To obtain more insight into how channel fading parameters affect OP performance, asymptotic expression is also evaluated. The results provide insight into the impact of key parameters, such as power allocation and channel fading parameters, on system performance. Ultimately, Monte Carlo simulations were used to validate the analytical expressions.