Simultaneously transmitting/refracting and reflecting reconfigurable intelligent surface (STAR-RIS) has been introduced to achieve full coverage area. This paper investigate the performance of STAR-RIS assisted non-orthogonal multiple access (NOMA) networks over Rician fading channels, where the incidence signals sent by base station are reflected and transmitted to the nearby user and distant user, respectively. To evaluate the performance of STAR-RIS-NOMA networks, we derive new exact and asymptotic expressions of outage probability and ergodic rate for a pair of users, in which the imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) schemes are taken into consideration. Based on the approximated results, the diversity orders of $zero$ and $ {\frac{{\mu _n^2K}}{{2{\Omega _n}}} + 1} $ are achieved for the nearby user with ipSIC/pSIC, while the diversity order of distant user is equal to ${\frac{{\mu _m^2 K}}{{2{\Omega _m}}}}$. The high signal-to-noise radio (SNR) slopes of ergodic rates for nearby user with pSIC and distant user are equal to $one$ and $zero$, respectively. In addition, the system throughput of STAR-RIS-NOMA is discussed in delay-limited and delay-tolerant modes. Simulation results are provided to verify the accuracy of the theoretical analyses and demonstrate that: 1) The outage probability of STAR-RIS-NOMA outperforms that of STAR-RIS assisted orthogonal multiple access (OMA) and conventional cooperative communication systems; 2) With the increasing of configurable elements $K$ and Rician factor $\kappa $, the STAR-RIS-NOMA networks are capable of attaining the enhanced performance; and 3) The ergodic rates of STAR-RIS-NOMA are superior to that of STAR-RIS-OMA.

翻译：同时传送/复制并反映可重新配置的智能表面(STAR-RIS)的性能已经引入,以达到全面覆盖范围。本文调查了STAR-RIS协助的非正方多功能访问(NOMA)网络在Rician淡化频道上的性能,其中基地站发送的事故信号被分别反映并传送给附近的用户和远方用户。为了评估STAR-RIS-NOMA网络的性能,我们为一对用户提供了新的准确和无症状的超频概率和超频率表达。在这个系统中,连续干扰取消(IPSIC)和完善的SIC(PSIC)系统不完善的不完善(IPSNO)的连续干扰取消(IPSNO2)和不完善的多端访问(PSIC)系统(IMA)的准确性能。STRA(STR-R)的超频度和STRA(IMA)的超频级(IMA-RAS-RA)的性能、STRA(IMA-I-Ral-I-I-lental-I)的性能、Sal-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-l)的性能的性能的性能的性能的性能的性能的性能的性能的性能的性能和(S-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-al-al-ral-ral-ral-ral-al-al-ral-ral-al-al-al-al-al-al-al-al-ral-al-al-ral-al-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-ral-al-ral-ral-l的性能的性能的性能的性能的性能的性能的性能