Abstract
In fifth-generation (5G) wireless communication systems, non-orthogonal multiple access (NOMA) has been considered as a promising multiple access technique. In this paper, a NOMA-based cooperative relay system (CRS) is proposed and analyzed. In contrast to the conventional cooperative relay NOMA system (system model in Kim and Lee (2015)), the proposed NOMA-based CRS allows a source and a relay to transmit a superimposed signal in the first and second time slots, respectively. The proposed scheme gives more reliable communication by fully leveraging the concepts of NOMA and cooperative relaying. The exact closed-form expressions for the outage probability are derived in a Rayleigh fading environment with imperfect successive interference cancellation (SIC) at the relay and destination. The outage performance of the proposed scheme is compared with the existing CRS-NOMA schemes. The paper also investigates the impact of various parameters on the outage performance of the proposed system. The accuracy of the analytical results is verified through simulations.
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