In contrast to conventional reconfigurable intelligent surface (RIS), simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) has been proposed recently to enlarge the serving area from 180o to 360o coverage. This work considers the performance of a STAR-RIS aided full-duplex (FD) non-orthogonal multiple access (NOMA) communication systems. The STAR-RIS is implemented at the cell-edge to assist the cell-edge users, while the cell-center users can communicate directly with a FD base station (BS). We first introduce new user clustering schemes for the downlink and uplink transmissions. Then, based on the proposed transmission schemes closed-form expressions of the ergodic rates in the downlink and uplink modes are derived taking into account the system impairments caused by the self interference at the FD-BS and the imperfect successive interference cancellation (SIC). Moreover, an optimization problem to maximize the total sum-rate is formulated and solved by optimizing the amplitudes and the phase-shifts of the STAR-RIS elements and allocating the transmit power efficiently. The performance of the proposed user clustering schemes and the optimal STAR-RIS design are investigated through numerical results

翻译：与传统可重构智能表面（RIS）不同，近年来提出的同时透射与反射可重构智能表面（STAR-RIS）将服务覆盖范围从180°扩展至360°。本文研究了STAR-RIS辅助全双工（FD）非正交多址接入（NOMA）通信系统的性能。STAR-RIS部署于小区边缘以辅助边缘用户，而小区中心用户可直接与全双工基站（BS）通信。首先，我们针对下行和上行传输提出了新的用户聚类方案。其次，基于所提出的传输方案，考虑全双工基站自干扰与不完美连续干扰消除（SIC）导致的系统损伤，推导了下行和上行模式的遍历速率闭式表达式。此外，通过优化STAR-RIS元件的幅度与相位偏移以及高效分配发射功率，构建并求解了最大化总和的优化问题。数值结果验证了所提用户聚类方案与最优STAR-RIS设计的性能。