Outage Probability Analysis and Transmit Power Optimization for Blind-Reconfigurable Intelligent Surface-Assisted Non-Orthogonal Multiple Access Uplink

Fifth-generation (5G) advancements improve transmitter and receiver functionalities, but the propagation environment remains uncontrolled. By changing the phase of impinging waves, reconfigurable intelligent surfaces (RIS) have the potential to regulate radio propagation environments. RIS-assisted n...

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Bibliographic Details
Published in:Sustainability 2022-10, Vol.14 (20), p.13188
Main Authors: Kumaravelu, Vinoth Babu, Imoize, Agbotiname Lucky, Soria, Francisco R. Castillo, Velmurugan, Periyakarupan Gurusamy Sivabalan, Thiruvengadam, Sundarrajan Jayaraman, Murugadass, Arthi, Gudla, Vishnu Vardhan
Format: Article
Language:English
Subjects:
Energy consumption
Energy efficiency
Impinging waves
Monte Carlo method
Noise levels
Nonorthogonal multiple access
Optimization
Outages
Power
Radio transmission
Reconfiguration
Satellite communications
Signal processing
Signal to noise ratio
Simulation
Sustainability
Unmanned aerial vehicles
Uplinking
Wave propagation
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Summary:Fifth-generation (5G) advancements improve transmitter and receiver functionalities, but the propagation environment remains uncontrolled. By changing the phase of impinging waves, reconfigurable intelligent surfaces (RIS) have the potential to regulate radio propagation environments. RIS-assisted non-orthogonal multiple access (NOMA) improves spectrum efficiency while enabling massive connectivity. The uplink outage probability expressions for blind-RIS-NOMA are derived in this work using RIS as a smart reflector (SR) and RIS as an access point (AP). Extensive Monte-Carlo simulations are performed to validate the derived closed-form expressions. The optimal powers to be allocated to the users are also derived in order to maximize the uplink sum capacity. In comparison to the sub-optimal power allocation, the optimal power allocation enhances the sum capacity. In terms of sum capacity for 20 dB signal-to-noise ratio (SNR) and 32 reflecting elements, it is demonstrated that the blind-RIS-NOMA surpasses the conventional NOMA by ≈38%. The sum capacity and outage performances are enhanced by the addition of RIS elements.
ISSN:2071-1050
2071-1050
DOI:10.3390/su142013188