南京邮电大学学报（自然科学版）2024，Vol.44Issue(3)：26-32,7.DOI:10.14132/j.cnki.1673-5439.2024.03.004
相移耦合的STAR-RIS辅助NOMA通信系统低功耗传输方案研究
A low-power transmission scheme for NOMA communication system assisted by phase-coupled STAR-RIS
摘要
Abstract
Simultaneously transmitting and reflecting reconfigurable intelligent surface(STAR-RIS)is regarded as an innovative technology for future B5G/6G wireless communications.It can be combined with non-orthogonal multiple access(NOMA)to enhance both the spectrum and the power efficiency substantially.Thus,the combination of STAR-RIS and NOMA has become a hot topic in the research of wireless communications.However,most of the existing literature on STAR-RIS focuses on the scenario with independent phase shifts,which ignores the coupling effects between the transmitting and the reflecting phase shifts in the practical realizations.In regard of this,this paper studies the STAR-RIS assisted NOMA communication system with coupled phase shifts,and formulates a joint optimization problem of beamforming at the base station,phase shifts,and amplitude coefficients.By using the successive convex approximation(SCA)and the semidefinite relaxation(SDR)tools,we design an effective alternating optimization algorithm to address the power minimization problem for the downlink STAR-RIS aided NOMA system.Simulation results show that the proposed scheme outperforms the traditional reflection-only RIS method.In addition,the performance of the proposed scheme is very close to that of the ideal STAR-RIS system with independent phase shifts.关键词
STAR-RIS/非正交多址接入/功率最小化/交替优化/相移耦合Key words
STAR-RIS/non-orthogonal multiple access(NOMA)/power minimization/alternating optimization/phase-coupling分类
信息技术与安全科学引用本文复制引用
付羿博,王鸿..相移耦合的STAR-RIS辅助NOMA通信系统低功耗传输方案研究[J].南京邮电大学学报（自然科学版）,2024,44(3):26-32,7.基金项目
国家自然科学基金面上项目(62171237)和江苏省研究生实践创新计划(SJCX23_0261)资助项目 （62171237）
