Combination of RIS and Fountain Codes in NOMA relay wireless networks for enhancing system performance and security

초록

Non-orthogonal multiple access (NOMA) and reconfigurable intelligent surface (RIS) are critical technologies for future wireless communications that provide spectral efficiency while consuming little power. In this research, we explore the security of a downlink NOMA wireless relay network that incorporates the RIS and Fountain Codes (FCs) technique. To assess system performance and security, we compute closed-form formulas for outage probability (OP) and intercept probability (IP). Furthermore, deep neural networks (DNNs) are used in the system model to evaluate and optimize OP and IP. Monte Carlo simulations are used to validate the theoretical conclusions, yielding the following major insights: (i) The major goal of these simulations is to validate analytical expressions. (ii) This study greatly improves our understanding of RIS-NOMA systems, setting the groundwork for future research into actual implementations. (iii) The results further illustrate the better performance of RIS-NOMA by evaluating important system factors such as the number of reflecting elements, the user threshold rate and the maximum number of encoded packets. © 2025 The Authors

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