FAS-RIS NOMA Communication Systems

In this paper, we pave the way to six-generation (6G) by investigating the outage probability (OP) of fluid antenna system (FAS)-reconfigurable intelligent surface (RIS) downlink non-orthogonal multiple access (NOMA) communication systems. We consider a FAS-RIS setup consisting of a base station (BS) with a single fixed-position antenna and a near user. (NU) and a far user (FU) both equipped with a fluid antenna (FA). Utilizing the Jack’s and block-correlation model, we derive a closed-form expression for the OP. Our analysis, supported by numerical results, confirms the accuracy and effectiveness of the derivation. Furthermore, the results demonstrate that the FAS-RIS NOMA system significantly outperforms other configurations in terms of OP.