On Performance Evaluation Of Hybrid Satellite-Terrestrial Relaying Networks With Fountain coding, NOMA and RIS
Abstract
In this paper, we analyze outage probability (OP) of a hybrid satellite-terrestrial non-orthogonal multiple access (NOMA) relay system, where Fountain coding is used. In this system, Fountain-encoded packets are transmitted from the satellite to two terrestrial users. To assist the communication between a satellite and users, a reconfigurable intelligent surface (RIS) and a relay node are simultaneously utilized. To employ the advantages of the cooperative scheme, at the relay station, the fountain-encoded packets are decoded and then forwarded both directly without the RIS and indirectly with the RIS to the two users. We analyze the system’s performance through theoretical analysis and propose a closed-form formula for the OP of both users over shadowing and Nakagami fading channels. Monte Carlo simulations confirm the correctness of the theoretical analysis by providing empirical evidence that supports the predicted outcomes under various scenarios and conditions. Additionally, factors influencing OP, such as satellite-terrestrial channel conditions, the number of reflecting elements in the RIS, Fountain coding parameters, and power allocation coefficients, are thoroughly investigated. Our findings demonstrate that integrating NOMA, RIS, and Fountain coding substantially improves system performance. Moreover, the results also reveal that to achieve the specified OP target, the system can dynamically adjust suitable power allocation coefficients for users, the number of elements in the reflector, or appropriate Fountain coding parameters.
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DOI: http://dx.doi.org/10.21553/rev-jec.415
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