Performance Analysis of Relay-Aided NOMA Optical Wireless Communication System in Underwater Turbulence Environment

Non-orthogonal multiple access (NOMA) is a promising technology to improve spectrum utilization effectively for underwater optical wireless communications (UOWC). To exploit the benefits of NOMA in turbulent environment, cooperative transmission has been introduced NOMA–UOWC network. The existing studies on suggest that relay selection and power optimization are main factors affecting system performance. In this paper, general node pairing method two schemes proposed, both proven be strictly quasi-convex. solved by BFGS algorithm particle swarm algorithm, respectively. effectiveness proposed evaluated our simulations, relay-aided performance derived.