Effects of Hardware Impairment on the Cooperative NOMA EH Relaying Network Over Nakagami- m Fading Channels
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Effects of Hardware Impairment on the Cooperative NOMA EH Relaying Network Over Nakagami‑m Fading Channels Thi Anh Le1 · Hyung Yun Kong1 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, we analyze the performance of Non Orthogonal Multiple Access (NOMA) Energy harvesting relaying system in presence of hardware impairments at both the transmitter and receiver over a Nakagami-m fading channel. The proposed system with destinations are allocated different power levels in which the source node communicates with the destinations via an energy harvesting (EH) relay employing a power-splitting relaying architecture and a direct link to the near destination. Moreover, the amplify-and-forward protocol at the EH relay is investigated to evaluate the performance of system. Additionally, the expressions for outage probability are derived, and these analyses are verified by a Monte Carlo simulation. Furthermore, these results are also compared to an orthogonal multiple access (OMA) system. Finally, the effects of various parameters, such as power allocation levels, position of EH relay node, channel coefficients, and hardware impairment levels on the outage performance and throughput of proposed NOMA-EH system and OMA system are investigated. These results demonstrate the advantage of NOMA-EH system as user fairness since multiple destinations compared to the OMA-EH system. Keywords Non-orthogonal multiple access · Energy harvesting · Hardware impairment · Nakagami-m fading · Orthogonal multiple access
1 Introduction Non-orthogonal multiple access (NOMA) is considered to be a breakthrough technique for the coming 5G and B5G mobile communication networks due to its high spectral efficiency and system capacity [1, 2]. Unlike orthogonal multiple access (OMA) approaches, like TDMA/ CDMA/OFDM, the key concept of NOMA is that multiple users with different power levels are served in the same frequency depending on the channel conditions [3]. In NOMA, a user with a better channel is allocated a lower power level, whereas a user with a worse channel is allocated more power to achieve user fairness and improve the system capacity [4]. Authors have recently investigated NOMA combined with other technique to obtain better performance, including NOMA-MIMO, cooperative NOMA, * Thi Anh Le [email protected] 1
Department of Electrical Engineering, University of Ulsan, Ulsan, South Korea
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and NOMA in the cognitive radio network. Specifically, authors in [5] investigated a new method of the massive MIMO and NOMA with receive antenna selection was considered for the uplink channel to significantly increase the number of connected devices and overall sum rate capacity with improved user-fairness and less complexity, and the cooperative NOMA network with the help of an amplify-and-forward relay using the energy harvesting technique to collect energy from radio signals over a Rayleigh fading channel was studied in [6]. In addit
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