Effects of Residual Hardware Impairments on Secure NOMA-Based Cooperative Systems

Non-orthogonal multiple access (NOMA) has been proposed as a promising technology that is capable of improving the spectral efficiency of fifth-generation wireless networks and beyond. However, in practical communication scenarios, transceiver architectures inevitably suffer from radio frequency (RF...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.2524-2536
Main Authors: Li, Meiling, Selim, Bassant, Muhaidat, Sami, Sofotasios, Paschalis C., Dianati, Mehrdad, Yoo, Paul D., Liang, Jie, Wang, Anhong
Format: Article
Language:English
Subjects:
Algorithms
Communications systems
Digital signal processing
Eavesdropping
Fading channels
Hardware
Intercept probability
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
outage probability
Performance degradation
physical layer security
Power system reliability
Probability
Radio frequency
Relay systems
Relays
residual hardware impairments
System effectiveness
Wireless networks
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Summary:Non-orthogonal multiple access (NOMA) has been proposed as a promising technology that is capable of improving 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 cause non-negligible performance degradation. This issue can be addressed by analog and digital signal processing algorithms, however, inevitable aspects of this approach such as time-varying hardware characteristics and imperfect compensation schemes result to detrimental residual distortions. In the present contribution we investigate the physical layer security of NOMA-based amplify-and-forward relay systems under such realistically incurred residual hardware impairment (RHI) effects. Exact and asymptotic analytic expressions for the corresponding outage probability (OP) and intercept probability (IP) of the considered setup over multipath fading channels are derived and corroborated by respective simulation results. Based on this, it is shown that RHI affects both the legitimate users and eavesdroppers by increasing the OP and decreasing the IP. For a fixed OP, RHI generally increases the corresponding IP, thereby reducing the secure performance of the system. Further interesting insights are provided, verifying the importance of the offered results for the effective design and deployment of secure cooperative communication systems.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2951940