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Open AccessFeature PaperArticle

I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems

1
School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2
Department of Engineering, Manchester Metropolitan University, Manchester M1 5GDM1 5GD, UK
3
Department of Computing and Mathematics, Manchester Metropolitan University, Manchester M15 6BH, UK
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(2), 249; https://doi.org/10.3390/electronics9020249
Received: 24 December 2019 / Revised: 26 January 2020 / Accepted: 1 February 2020 / Published: 3 February 2020
(This article belongs to the Special Issue Cooperative Communications for Future Wireless Systems)
Non-orthogonal multiple access (NOMA) system can meet the demands of ultra-high data rate, ultra-low latency, ultra-high reliability and massive connectivity of user devices (UE). However, the performance of the NOMA system may be deteriorated by the hardware impairments. In this paper, the joint effects of in-phase and quadrature-phase imbalance (IQI) and imperfect successive interference cancellation (ipSIC) on the performance of two-way relay cooperative NOMA (TWR C-NOMA) networks over the Rician fading channels are studied, where two users exchange information via a decode-and-forward (DF) relay. In order to evaluate the performance of the considered network, analytical expressions for the outage probability of the two users, as well as the overall system throughput are derived. To obtain more insights, the asymptotic outage performance in the high signal-to-noise ratio (SNR) region and the diversity order are analysed and discussed. Throughout the paper, Monte Carlo simulations are provided to verify the accuracy of our analysis. The results show that IQI and ipSIC have significant deleterious effects on the outage performance. It is also demonstrated that the outage behaviours of the conventional OMA approach are worse than those of NOMA. In addition, it is found that residual interference signals (IS) can result in error floors for the outage probability and zero diversity orders. Finally, the system throughput can be limited by IQI and ipSIC, and the system throughput converges to a fixed constant in the high SNR region. View Full-Text
Keywords: two-way relay; non-orthogonal multiple access; in-phase and quadrature-phase imbalance; imperfect successive interference cancellation; orthogonal multiple access two-way relay; non-orthogonal multiple access; in-phase and quadrature-phase imbalance; imperfect successive interference cancellation; orthogonal multiple access
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Tian, X.; Li, Q.; Li, X.; Peng, H.; Zhang, C.; Rabie, K.M.; Kharel, R. I/Q Imbalance and Imperfect SIC on Two-Way Relay NOMA Systems. Electronics 2020, 9, 249.

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