Abstract
In this paper, we investigate the performance of two-way multiple relay non-orthogonal multiple access (NOMA) based networks with hardware impairments (HIs). Especially, opportunistic relay selection scheme is applied to enhance the spectral efficiency along with the spatial diversity. With the increasing of relay's processing capacity, decode-and-forward (DF) protocol is considered in the networks. Based on the proposed relay selection scheme and NOMA protocol, the closed-form expressions for the outage probability (OP) of the system are derived. In order to study the energy efficiency (EE) of the system, simulation results for EE are also obtained. Furthermore, for the purpose of observing the impacts of HIs' level, NOMA protocol and the number of relays on the system performance at high signal-to-noise ratios (SNRs), the asymptotic expressions of the OP are also derived. Finally, Monte Carlo (MC) simulation results are presented to verify the correctness of the analytical results.
Highlights
Non-orthogonalmultiple access (NOMA) is considered as a promising candidate for future 5G and B5G networks [1]
We find that the asymptotic curves are nearly the same with simulation results at high signal-to-noise ratios (SNRs), which confirms the validity of our asymptotic analysis
In this paper, we investigated the performance of non-orthogonal multiple access (NOMA) based two-way relay networks with hardware impairments (HIs)
Summary
Non-orthogonalmultiple access (NOMA) is considered as a promising candidate for future 5G and B5G networks [1]. Considering the impact of channel state information (CSI), the authors in [12] investigated the performance of amplify-and-forward (AF) relay for downlink NOMA networks, where the exact and tight bounds of outage probability (OP) were derived. In [29], the authors studied the impact of hardware impairments (HIs) on two-way relay networks by deriving the analytical expression for the OP. To its regret, they only paid their attentions to the HIs at relay and neglected the HIs at sources. Motivated by the above discussions, we take the HIs and opportunistic relay selection scheme into account, we investigate the performance of two-way multiple relay NOMA based networks.
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