Performance Analysis of Non-Orthogonal Multiple Access Under I/Q Imbalance

Non-orthogonal multiple access (NOMA) has been recently proposed as a viable technology that can potentially improve the spectral efficiency of fifth generation wireless networks and beyond. However, in practical communication scenarios, transceiver architectures inevitably suffer from radio-frequen...

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Bibliographic Details
Published in:IEEE access 2018-01, Vol.6, p.18453-18468
Main Authors: Selim, Bassant, Muhaidat, Sami, Sofotasios, Paschalis C., Sharif, Bayan S., Stouraitis, Thanos, Karagiannidis, George K., Al-Dhahir, Naofal
Format: Article
Language:English
Subjects:
Asymptotic properties
Fading channels
Hardware impairments
I/Q imbalance
Impairment
Interference
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
OFDM
outage probability
Quadratures
Radio frequency
Signal to noise ratio
Transceivers
Wireless networks
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Summary:Non-orthogonal multiple access (NOMA) has been recently proposed as a viable technology that can potentially improve the spectral efficiency of fifth generation wireless networks and beyond. However, in practical communication scenarios, transceiver architectures inevitably suffer from radio-frequency (RF) front-end related impairments that can lead to degradation of the overall system performance with in-phase/quadrature-phase imbalance (IQI) constituting a major impairment in direct-conversion transceivers. In this paper, we quantify the effects of IQI on the performance of NOMA-based single-carrier (SC) and multi-carrier (MC) systems under multipath fading conditions. This is realized by first deriving analytic expressions for the signal-to-interference-plus-noise ratio and the outage probability of both SC and MC NOMA systems subject to IQI at the transmitter and/or receiver (RX) side. Furthermore, we derive asymptotic diversity orders for all considered impairment scenarios. Capitalizing on these results, we demonstrate that the effects of IQI differ considerably among NOMA users and depend on the underlying systems' parameters. For example, for a target data rate and power allocation ratio satisfying a given condition, IQI does not affect the asymptotic diversity of SC NOMA systems, whereas the asymptotic diversity of MC NOMA systems, suffering from RX IQI, is always zero. Moreover, it is shown that for both SC and MC NOMA systems, the first sorted user appears more robust to IQI, which indicates that higher order users are more sensitive to the considered impairment.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2820074