Abstract-In this paper, we consider non-orthogonal multiple access (NOMA) relaying networks, where one base station communicates with two mobile users with the aid of multiple relays. We propose a two-stage relay selection strategy for NOMA networks with decode-and-forward (DF) and amplify-and-forward (AF) relaying protocols with different quality of service requirements at the users, respectively. Then, the outage probabilities of the NOMA two-stage DF and AF schemes are obtained in closedform expressions, and the diversity order is determined based on their asymptotic expressions at high signal-to-noise ratio. Both of the developed analytical results and carried out computer simulations show that NOMA two-stage DF (AF) relaying is superior to existing relay selection strategies developed for cooperative NOMA and orthogonal multiple access networks. Index Terms-Cooperative non-orthogonal multiple access, amplify-and-forward, decode-and-forward, outage probability.
The two-stage decode-and-forward (DF) and amplify-and-forward (AF) relay selection schemes were proposed in REF , where the superimposed signal is received by multiple relays and the best one will forward the signal to both near and far users according to the NOMA protocol.
Novel Relay Selection Strategies for Cooperative NOMA
IEEE Transactions on Vehicular Technology
IEEE Transactions on Vehicular Technology
Computer Science