Performance Analysis of RIS-assisted Full-Duplex Two-Way NOMA using iFBL and FBL Codes

This paper investigates the performance of reconfigurable intelligent surface (RIS) assisted full-duplex two-way (FDTW) non-orthogonal multiple access (NOMA) (RIS-FDTW-NOMA) systems under infinite block-length (iFBL) and finite block-length (FBL) transmission regimes. In this system, two users exchange their information simultaneously through NOMA with the help of RIS. To assess the system performance in the iFBL regime, we derived the analytical expression of outage probability (OP) and system throughput using the moment matching method and the Gauss-Chebyshev quadrature (GCQ) method. For FBL transmission, we derived the analytical expression of the average block error rate (ABLER) by using the GCQ method. We also obtained the expressions for system throughput, goodput, latency, and reliability from the ABLER expression. Monte Carlo simulations are performed to verify the accuracy of the analytical expressions. Numerical results reveal that our proposed system provided better OP, ABLER, and higher throughput than the RIS-aided two-way-orthogonal multiple access (RIS-TW-OMA) system.