On the Performance of Non-Orthogonal Multiple Access schemes in Coordinated Direct with Partial Relay Selection

In this paper, we study a Non-Orthogonal Multiple Access (NOMA) based cooperative protocol using the partial relay selection (PRS) technique over Rayleigh fading channel. In the proposed scheme, a source S combines two different data and transmits them to two destinations D
1
and D
2
. While the destination D
1
receives data directly from the source S, the destination D
2
only receives data with support from one of potential relay selection (RS) in this work which uses selection combining (SC) technique to combine the received data. In order to evaluate the performance of the proposed scheme, analytical expressions of outage probability and ergodic sum capacity are derived. Finally, we performed Monte Carlo simulations to verify the theoretical analysis.