This 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 two non-orthogonal users located on either side of the surface by utilizing the mode switching protocol. We derive the closed-form and upper bound 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.

翻译：本信调查同时传输和反映可重新配置的智能表面(STAR-RIS)在非横向多重访问网络(NOMA)中的比特错误率(BER)性能。在被调查的网络中,STAR-RIS通过使用模式转换协议为位于地表两侧的两个非横向用户服务。我们用完美和不完美的连续取消干扰案例来得出封闭式和上层约束的BER表达式。此外,还进行了无干扰分析,以进一步深入了解信号到音频率高的区域BER的行为。最后,我们理论分析的准确性通过MonteCarlo模拟得到验证。获得的结果显示,STAR-RIS-NOMA的BA性能超越了典型NOMA系统,STAR-RIS的BA性能可能是一个充满希望的NOMA 2.0解决方案。