Department of Electrical and Electronics Engineering2024-11-0920221089-779810.1109/LCOMM.2022.31797312-s2.0-85131732399https://hdl.handle.net/20.500.14288/3763This letter investigates the bit error rate (BER) performance of simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs) in non-orthogonal multiple access (NOMA) networks. In the investigated network, a STAR-RIS serves multiple non-orthogonal users located on either side of the surface by utilizing the mode switching protocol. We derive the closed-form BER expressions in perfect and imperfect successive interference cancellation cases. Furthermore, asymptotic analyses are also conducted to provide further insights into the BER behavior in the high signal-to-noise ratio region. Finally, the accuracy of our theoretical analysis is validated through Monte Carlo simulations. The obtained results reveal that the BER performance of STAR-RIS-NOMA outperforms that of the classical NOMA system, and STAR-RIS might be a promising NOMA 2.0 solution.pdfTelecommunicationsJournal Article1558-2558https://doi.org/10.1109/LCOMM.2022.3179731841808700020Q2NOIR03831