Performance Analysis of NOMA in 5G Systems with HPA Nonlinearities

In this paper, we provide an analytical performance assessment of downlink non-orthogonal multiple access (NOMA) systems over Nakagami-m fading channels in the presence of nonlinear high-power amplifiers (HPAs). By modeling the distortion of the HPA by a nonlinear polynomial model, we evaluate the p...

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Bibliographic Details
Published in:IEEE access 2020-01, Vol.8, p.1-1
Main Authors: Belkacem, O. B. Haj, Ammari, M. L., Dinis, Rui
Format: Article
Language:English
Subjects:
Distortion
Downlink
Ergodic processes
ergodic sum rate
Fading channels
high-power amplifiers (HPA)
Interference
Lower bounds
Mathematical analysis
Monte Carlo simulation
NOMA
non-orthogonal multiple access (NOMA)
Nonlinear distortion
nonlinear polynomial model
Nonorthogonal multiple access
outage probability (OP)
Performance assessment
Performance evaluation
Polynomials
Power amplifiers
Signal to noise ratio
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Summary:In this paper, we provide an analytical performance assessment of downlink non-orthogonal multiple access (NOMA) systems over Nakagami-m fading channels in the presence of nonlinear high-power amplifiers (HPAs). By modeling the distortion of the HPA by a nonlinear polynomial model, we evaluate the performance the NOMA scheme in terms of outage probability (OP) and ergodic sum rate. Hence, we derive a new closed-form expression for the exact OP, taking into account the undesirable effects of HPA. Furthermore, to characterize the diversity order of the considered system, the asymptotic OP in the high signal-to-noise (SNR) regime is derived. Moreover, the ergodic sum rate is investigated, resulting in new upper and lower bounds. Our numerical results demonstrate that the performance loss in presence of nonlinear distortions is very substantial at high data rates. In particular, it is proved that in presence of HPA distortion, the ergodic sum rate cannot exceed a determined threshold which limits its performance compared to the ideal hardware case. Monte-Carlo simulations are conducted and their results agree well with the analytical results.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.3020372