Performance analysis of cooperative NOMA with a shared AF relay

• Published in: IET communications 2018-11, Vol.12 (19), p.2438-2447
• Main Authors: Li, Yan, Li, Yongzhao, Chen, Yunfei, Ye, Yinghui, Zhang, Hailin
• Format: Article
• Language: English
• Subjects: 5G mobile communication; amplify and forward communication; amplify‐and‐forward relay; approximation theory; closed‐form approximations; cooperative communication; cooperative NOMA‐AF‐CRS techniques; cooperative relaying scheme; diversity reception; ergodic sum capacity; fifth generation wireless networks; multi‐access systems; nonorthogonal multiple access techniques; orthogonal multiple access techniques; probability; relay networks (telecommunication); Research Article; shared AF relay; signal‐to‐noise ratio region; telecommunication network reliability
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2018.5415

Non-orthogonal multiple access (NOMA) has been proposed as a promising technique for the fifth generation wireless networks. In this study, the authors investigate the performance of a cooperative relaying scheme using NOMA (termed NOMA-AF-CRS), where two sources communicate with their corresponding destinations over the same frequency simultaneously through a shared amplify-and-forward (AF) relay. First, the closed-form approximations are derived for the outage probability. The analytical results are further evaluated in the high signal-to-noise ratio region to characterise the diversity order achieved by the system. Then, the ergodic sum capacity of NOMA-AF-CRS is analysed and an upper bound to the ergodic sum capacity is derived. Finally, simulation results are presented to verify the proposed analysis and demonstrate the advantages of NOMA-AF-CRS over the conventional orthogonal multiple access techniques.