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

Vinoth Babu Kumaravelu (), Agbotiname Lucky Imoize (), Francisco R. Castillo Soria, Periyakarupan Gurusamy Sivabalan Velmurugan, Sundarrajan Jayaraman Thiruvengadam, Arthi Murugadass and Vishnu Vardhan Gudla
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Vinoth Babu Kumaravelu: Department of Communication Engineering, School of Electronics Engineering, Vellore Institute of Technology, Vellore 632014, India
Agbotiname Lucky Imoize: Department of Electrical and Electronics Engineering, Faculty of Engineering, University of Lagos, Akoka, Lagos 100213, Nigeria
Francisco R. Castillo Soria: Telecommunications Department, Faculty of Science, Autonomous University of San Luis Potosí (UASLP), San Luis Potosí 78300, Mexico
Periyakarupan Gurusamy Sivabalan Velmurugan: Department of Electronics and Communication Engineering, Thiagarajar College of Engineering, Madurai 625015, India
Sundarrajan Jayaraman Thiruvengadam: Department of Electronics and Communication Engineering, Thiagarajar College of Engineering, Madurai 625015, India
Arthi Murugadass: Department of Computer Science and Engineering (AI & ML), Sreenivasa Institute of Technology and Management Studies, Chittoor 517127, India
Vishnu Vardhan Gudla: Department of Electronics and Communication Engineering, Aditya Engineering College, Surampalem 533437, India

Sustainability, 2022, vol. 14, issue 20, 1-21

Abstract: 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.

Keywords: sixth-generation (6G); blind transmission; non-orthogonal multiple access (NOMA); outage probability; reconfigurable intelligent surfaces (RIS); sum capacity (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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