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September 10, 2025

Performance of a Reconfigurable Intelligent Surface‐Assisted D2D Communication Network Using NOMA: An Overlay Scenario

Key Points

D2D communication performance is enhanced significantly using an RIS with a non-orthogonal multiplexing scheme.
The research shows that optimizing the position of the RIS can significantly reduce outage and improve throughput during communication.
A comprehensive analytical model defines the channels' performance, revealing the effects of interference factors on network quality.
Extensive simulations demonstrate that variables like sensing time and interference thresholds greatly influence the system's performance indicators.

Abstract

ABSTRACT A reconfigurable intelligent surface (RIS)‐assisted device‐to‐device (D2D) network is studied in this paper where devices are cognitive radio (CR). D2D devices communicate with each other in overlay mode using cellular user (CU) spectrum and non‐orthogonal multiplexing (NOMA) scheme. The RIS is strategically positioned to enhance D2D communication performance and to reduce interference effectively. It is considered that the RIS‐associated channels are Rician faded while the direct channels are Rayleigh faded; that is, a mixed channel approach is considered. A comprehensive analytical framework is established to describe the signal model and performance parameters from source to destination with the perfect and imperfect successive interference cancellation (SIC). To find the optimal position of RIS, an algorithm is also developed. It focuses on two key performance indicators: outage and throughput. The closed‐form expressions of outage and throughput are developed. A simulation platform is developed, and extensive simulations are carried out to study the performance indicators. It investigates the impact of various network parameters, such as sensing time, an imperfection in SIC, interference threshold, and so forth, on outage and throughput.

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