Approximation of Capacity for Downlink Multi-User System with Combination of Precoding and NOMA Methods

Enhancing performance of downlink MU systems is an attractive and important research for future wireless systems. The non-orthogonal multiple access (NOMA) method was proposed to improve the In order further outage probability (OP) ergodic capacity (EC) NOMA systems, we propose combination precoding methods, then OP EC with our novel are derived in scenarios perfect imperfect successive interference cancellation (SIC) scheme. Moreover, closed-form expression both theoretically compared Monte Carlo simulations. results show that, analysis accurate, combining can enhance comparing original orthogonal method.