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 approximate 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 asymptotic expressions, the diversity orders of the nearby user with ipSIC/pSIC and distant user are achieved carefully. The high signal-to-noise ratio 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 reflecting 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:本文调查了Star-RIS协助的非骨形多重访问网络在里西亚退位频道上的表现,在这些频道上,基地站发送的事件信号得到反映,并分别传送给附近的用户和远处用户;为评价STAR-RIS-NOMA网络的性能,我们为一对用户提出了新的差价和超速率的近似表示,其中考虑到连续取消干扰(IPSIC)和完善的SIC(PSIC)计划等不完善的连续取消干扰(IPSIC)和完善的SIC(PSIC)计划。根据无症状的表达方式、使用IPSIC/PISIC和远处传统用户的附近用户的多样性命令,分别反映和传送给附近的用户和远处用户的电传率高的信号-噪音比率,分别相当于1美元和零美元。此外,STRAS-RIMA系统在延迟和缓冲性货币-MA(SMA)的升级的升级的系统、升级的升级的系统、升级的升级性能分析,SIMA-RISA的精度和升级的精度分析,S-MA的精度-SMAR-RIS-RA-RA-RA-RA-RA-RA-RA-RA-RA-RA-RA-RA-RA-S-A-RA-RA-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-R-S-R-1-S-1-S-S-S-1-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-S-R-R-R-R-R-S-R-S-S-R-