Controlled power cooperative non orthogonal multiple access relay networks

Abstract

Recent work related to cooperative communication and power allocation has attracted much attention among researchers. This paper compares orthogonal multiple access (OMA), non orthogonal multiple access (NOMA), and cooperative NOMA. NOMA takes the advantage of successive interference (SIC) for detection at the receiver. Strong(near) users are used as a relay for helping in transmission of weak (far) users or in other words cooperative communication is implemented. In this paper, near users are used as relays for far users. One far user and many near users scenarios are considered. The total transmission is divided into two stages namely: direct and the cooperative. The proposed work also give priority to certain users while maintaining the fairness in resource allocation. The simulated results from MATLAB verify the theoretical knowledge that cooperative communication outperforms non-cooperative communication for the outage probability, achievable rate, and transmit power. In this paper, closed form outage probability expressions are used.