NOMA assisted underwater visible light communication system with full-duplex cooperative relaying

In this work, we propose a non-orthogonal multiple access (NOMA) assisted underwater visible light communication system (UWVLC) with full-duplex cooperative relaying (FDCR). The near NOMA user (U1) supports the FDCR phenomena to assist the NOMA far user (U2) with the information transmission. The UWVLC channels are assumed to be Exponential-Generalized Gamma (EGG) distributed. The exact analytical expressions of achievable outage probability are derived for both the NOMA users under the practical assumption of imperfect successive interference cancellation (SIC) and residual self-interference (RSI) due to FDCR. Besides, we also present the coverage probability and system outage probability of the considered FDCR based NOMA system. Further, the system's performance is examined for the distinct underwater scenarios like water salinity, gradient temperature and air bubble level (BL), so as to verify the system's viability.