STARS辅助SWIPT-NOMA通信系统的功率分配和波束赋形设计  

Power Allocation and Beamforming Design in STARS Assisted SWIPT-NOMA Systems

作　　者：赵鹏飞 左加阔 温陈驰 ZHAO Pengfei;ZUO Jiakuo;WEN Chenchi(School of Internet of Things,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学物联网学院,江苏南京210003

出　　处：《中北大学学报(自然科学版)》2025年第2期237-244,共8页Journal of North University of China(Natural Science Edition)

基　　金：中国博士后科学基金资助项目(2021M693699);泛网无线通信教育部重点实验室(BUPT)资助项目(KFKT-2022105)。

摘　　要：基于可重构智能表面(RIS)的无线通信网络要求用户与基站(BS)须在同一侧,这极大地限制了RIS部署的灵活性和有效性,而反射和透射智能表面(STARS)突破了RIS半空间通信覆盖的限制,实现了通信的全空间覆盖率和灵活部署,因而为无线通信网络的优化提供了新的自由度。为了进一步提高无线携能通信(SWIPT)系统的性能,基于STARS和NOMA技术,构建了STARS辅助SWIPT-NOMA通信系统模型。以最小化BS发射功率为目标,提出了用户发射功率和STARS处波束赋形联合优化的方案。由于优化问题中变量的耦合性和约束的非凸性,很难直接求解该问题,为此设计了一种基于交替优化(AO)的优化算法。该算法利用顺序秩一约束松弛(SROCR)算法求解STARS处的反射和透射相移矩阵,再与用户发射功率进行交替求解。仿真结果表明,本文所提方案收敛迅速,相较于其他方案功耗更低,性能更优越。Reconfigurable intelligent surfaces(RISs)-based wireless communication networks require that users and base stations(BSs)need to be on the same side,which greatly limits the flexibility and effec-tiveness of RIS deployment.Whereas the simultaneously transmitting and reflecting reconfigurable intelli-gent surface(STAR-RIS)breaks through the RIS half-space communication coverage limitation and achieves full spatial coverage and flexible deployment of communication,which provides a new degree of freedom for wireless communication network optimization.To further improve the performance of simulta-neous wireless information and power transfer(SWIPT)system,a STARS-assisted SWIPT-NOMA communication system model was constructed based on STARS and non-orthogonal multiple access(NOMA)technologies.With the objective of minimizing the base station(BS)transmit power,a joint optimization scheme of user transmit power and beam assignment at STARS was proposed.Due to the coupling of variables and non-convexity of constraints in the optimization problem,it was difficult to solve the problem directly,for which an optimization algorithm based on alternating optimization(AO)was designed.The algorithm solved the reflection and transmission phase shift matrices of STARS using the sequential rank-one constraint relaxation(SROCR)algorithm,which was then alternated with the user transmit power.Simulation results show that the scheme proposed in this paper converges rapidly,con-sumes less power and has superior performance compared to other schemes.

关 键 词：智能反射面 无线携能通信 非正交多址 可同时反射和透射 

分 类 号：TN929.5[电子电信—通信与信息系统]