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 $, the STAR-RIS-NOMA networks are capable of attaining the enhanced performance; and 3) The ergodic rates of STAR-RIS-NOMA are superior to that of STAR-RIS-OMA.
翻译:为了实现覆盖区,本文件调查了Star-RIS协助的非口头多访问网络(NOMA)在Rician退位频道上的运行情况,其中基地站发送的事故信号分别反映并传送给附近的用户和远端用户。为了评价STAR-RIS-NOMA网络的运行情况,我们为一对用户提出了新的准确和无症状的超速概率和超速率表达方式,其中考虑到连续干扰取消(IPSIC)和完全的SIC-RIS(PSIC)计划不完善。根据大致结果,基站发送的频率信号为零美元和美元;为附近的用户提供IPSICT/PSIC的运行情况,而远端用户的频率为$@m2 KQRIS-MA的多样化顺序相当于美元(IPS-IMA)的连续干扰取消(IPRISA-RIA的高级信号-时间延迟度分析,STRA的S-RISDR的S-ral-lal-lational-ral-lational-ral-ral-rational-ral-rational-ration Slational-ral-lational-ral-lational-lational-lational-lational-lational-lational-lational-lational-lationsal-sal-lations) 和Slation-S-slation-s-s-s-Slation-lation-lation-s-s-slation-slation-lation-lation-lation-lation-lation-lation-lation-lation-s-lation-lation-s-s-s-s-s-s-s-s-sal-s-s-s-s-s-s-s-s-l-l-lation-lation-lation-sal-lation-lation-lation-lation-lation-lation-lation-lation-lal-sal-l-l-l-l-l-lation-lation-lation-l-l-lation-lal-lal-lal-lation-lation-lation-lal-l