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access icon free Non-orthogonal multiple access schemes with partial relay selection

© The Institution of Engineering and Technology
Received 28/07/2016, Accepted 18/12/2016, Revised 14/12/2016, Published 20/12/2016

Non-orthogonal multiple access (NOMA) in amplify-and-forward relay systems with partial relay selection (PRS) is investigated. More specifically, new exact closed-form expressions for the outage probabilities at two users are derived, based on which an asymptotic analysis at high signal-to-noise ratio (SNR) is carried out. Additionally, to investigate the performance gap between the NOMA and orthogonal multiple access (OMA) schemes, a closed-form approximate expression at high SNR for the sum rate is derived. Furthermore, relying on the results, the impact of the PRS on the sum rate and outage probability of the proposed NOMA scheme is examined. In particular, the derived asymptotic expressions show that the proposed scheme can improve over the traditional OMA not only the sum rate but also the user fairness. Finally, simulation results are presented to corroborate the analytical results.

Inspec keywords: probability; relay networks (telecommunication); multi-access systems; amplify and forward communication; telecommunication network reliability

Other keywords: SNR; exact closed-form expressions; NOMA; asymptotic expressions; signal-to-noise ratio; partial relay selection; PRS; outage probabilities; nonorthogonal multiple access schemes; amplify-and-forward relay systems; asymptotic analysis; closed-form approximate expression

Subjects: Reliability; Radio links and equipment; Other topics in statistics; Multiple access communication

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