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Large intelligent surface (LIS) has recently emerged as a potential enablingtechnology for 6G networks, offering extended coverage and enhanced energy andspectral efficiency. In this work, motivated by its promising potentials, weinvestigate the error rate performance of LIS-assisted non-orthogonal multipleaccess (NOMA) networks. Specifically, we consider a downlink NOMA system, inwhich data transmission between a base station (BS) and $L$ NOMA users isassisted by an LIS comprising $M$ reflective elements. First, we derive theprobability density function of the end-to-end wireless fading channels betweenthe BS and NOMA users. Then, by leveraging the obtained results, we derive anapproximate expression for the pairwise error probability (PEP) of NOMA usersunder the assumption of imperfect successive interference cancellation.Furthermore, accurate expressions for the PEP for $M = 1$ and large $M$ values($M > 10$) are presented in closed-form. To gain further insights into thesystem performance, an asymptotic expression for the PEP in highsignal-to-noise ratio regime, the achievable diversity order, and a tight unionbound on the bit error rate are provided. Finally, numerical and simulationresults are presented to validate the derived mathematical results.

Large Intelligent Surface Assisted Non-Orthogonal Multiple Access: Performance Analysis