STAR-RIS辅助上行NOMA系统中最大化能量效率的方法  

A Method to Maximize Energy Efficiency in STAR-RIS Assisted Uplink NOMA Systems

作　　者：田心记 孟浩然 TIAN Xinji;MENG Haoran(Institute of Physics and Electronic Information,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学物理与电子信息学院,焦作454003

出　　处：《北京邮电大学学报》2025年第1期66-72,共7页Journal of Beijing University of Posts and Telecommunications

基　　金：河南省科技攻关项目(232102211073)。

摘　　要：对于同时透射和反射的可重构智能表面(STAR-RIS)辅助的上行非正交多址接入(NOMA)系统,提出了一种最大化能量效率的方法。首先构建最大化能量效率的优化问题,优化参数为基站波束赋形、STAR-RIS相移、用户功率和时间分配;然后通过推导波束赋形与STAR-RIS相移等参数之间的关系和用户所需的最低功率,简化该优化问题;最后,用迭代的方法交替优化STAR-RIS相移、功率分配和时间分配,在每次迭代过程中使用半正定规划法优化STAR-RIS相移、使用Dinkelbach算法优化功率、使用函数极值法优化时间分配。仿真结果显示,在时间切换协议中时间分配对能量效率影响较小,STAR-RIS相移对能量效率影响较大。A method to maximize energy efficiency is proposed for uplink non-orthogonal multiple access(NOMA)systems assisted by simultaneously transmitting and reflecting reconfigurable intelligent surface(STAR-RIS).Firstly,the optimization problem of maximizing energy efficiency is constructed,with base station beamforming,STAR-RIS phase shift,users'power and time allocation as variables.Then,the problem is simplified by deducing the relationship between beamforming and STAR-RIS phase shift as well as the minimum power required by the users.Finally,an iterative method is proposed to optimize STAR-RIS phase shift,power allocation and time allocation alternately.In each iteration,semi-definite programming method is used to optimize STAR-RIS phase shift,Dinkelbach algorithm to optimize power allocation,and function extremal method to optimize time allocation.The simulation results show that in the time switching protocol,time allocation has little effect on energy efficiency,while STAR-RIS phase shift has great effect on energy efficiency.

关 键 词：非正交多址接入 同时透射和反射的可重构智能表面 能量效率 功率 相移 

分 类 号：TN929.5[电子电信—通信与信息系统]