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Open AccessArticle

On the Performance of Energy Harvesting Non-Orthogonal Multiple Access Relaying System with Imperfect Channel State Information over Rayleigh Fading Channels

1
Faculty of Radio Electronics, Le Quy Don Technical University, Hanoi 11917, Vietnam
2
Faculty of Telecommunications Services, Telecommunications University, Khanh Hoa 650000, Vietnam
3
Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
4
Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
*
Author to whom correspondence should be addressed.
Current address: 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7, Ho Chi Minh City 758307, Vietnam.
Sensors 2019, 19(15), 3327; https://doi.org/10.3390/s19153327
Received: 31 May 2019 / Revised: 15 July 2019 / Accepted: 19 July 2019 / Published: 29 July 2019
(This article belongs to the Special Issue Green, Energy-Efficient and Sustainable Networks)
In this paper, we propose a non-orthogonal multiple access (NOMA) relaying system, where a source node communicates simultaneously with multiple users via the assistance of the best amplify-and-forward (AF) relay. The best relay is selected among N relays which are capable of harvesting the energy from radio frequency (RF) signals. We analyze the performance of the proposed NOMA relaying system in the conditions of imperfect channel state information (CSI) and Rayleigh fading by deriving the exact expressions of the outage probability (OP) and the approximate expression of the ergodic capacities of each user and the whole system. We also determine the optimal energy harvesting duration which minimizes the OP. Numerical results show that, for the same parameter settings, the performance of the proposed NOMA relaying system, especially the ergodic capacity of the whole system, outperforms that of the orthogonal-multiple-access (OMA) relaying system. Monte-Carlo simulations are used to validate the correctness of the analytical results. View Full-Text
Keywords: NOMA; energy harvesting; amplify-and-forward; imperfect CSI; successive interference cancellation (SIC) NOMA; energy harvesting; amplify-and-forward; imperfect CSI; successive interference cancellation (SIC)
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Hoang, T.M.; Van, N.L.; Nguyen, B.C.; Dung, L.T. On the Performance of Energy Harvesting Non-Orthogonal Multiple Access Relaying System with Imperfect Channel State Information over Rayleigh Fading Channels. Sensors 2019, 19, 3327.

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