双STAR-RIS辅助下行NOMA系统中最大化和速率的方法

田心记; 孟浩然; 李兴旺; 张辉

doi:10.11999/JEIT240007

双STAR-RIS辅助下行NOMA系统中最大化和速率的方法

doi: 10.11999/JEIT240007

1.
河南理工大学物理与电子信息学院焦作 454003
2.
贵州理工学院矿业工程学院贵阳 550003

基金项目: 国家自然科学基金(52164007)，河南理工大学博士基金(B2018-39)

详细信息

作者简介:
田心记：女，副教授，研究方向为新一代宽带移动通信系统的新理论及技术

孟浩然：男，硕士生，研究方向为新一代无线通信技术

李兴旺：男，副教授，研究方向为新一代宽带移动通信系统的新理论及技术

张辉：男，教授，研究方向为智能信息开采、矿井通信

通讯作者:
田心记　tian215216@sohu.com

中图分类号: TN92
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-16
- 修回日期: 2024-06-11
- 网络出版日期: 2024-06-18
- 刊出日期: 2024-09-26

Method of Maximizing Sum Rate for Dual STAR-RIS Assisted Downlink NOMA Systems

1.
Institute of Physics and Electronic Information, Henan Polytechnic University, Jiaozuo 454000, China
2.
Institute of Mining Engineering, Guizhou Institute of Technology, Guiyang 550003, China

Funds: The National Natural Science Foundation of China (52164007), The Doctoral Fund of Henan Polytechnic University (B2018-39)

摘要

摘要: 对于两个同时透射和反射的智能可重构表面(STAR-RIS)辅助的下行非正交多址接入(NOMA)系统，该文提出一种最大化和速率的方法。首先构建最大化和速率的优化问题，优化参数为STAR-RIS相移、功率分配和时间分配；然后用半正定规划法(SDP)优化双STAR-RIS相移；最后，用迭代的方法交替优化功率分配和时间分配，在每次迭代过程中分别用拉格朗日对偶分解法优化功率分配和函数极值法优化时间分配。仿真结果显示，双STAR-RIS辅助的NOMA系统的和速率高于单STAR-RIS辅助的NOMA系统。
- 非正交多址接入 /
- 同时透射和反射的智能可重构表面 /
- 和速率 /
- 功率 /
- 相移
Abstract: A sum-rate maximization method is proposed for two Simultaneously Transmitting And Reflecting Reconfigurable Intelligent Surface (STAR-RIS) assisted downlink Non-Orthogonal Multiple Access (NOMA) systems. Firstly, the optimization problem for maximizing sum rate is constructed, with STAR-RIS phase shifts, power allocation and time allocation as optimization parameters. Then the Semi-Definite Programming method (SDP) is used to optimize the phase shifts of these two STAR-RISs. Finally, the power allocation and time allocation are optimized alternately by iterative method. In each iteration, Lagrange dual decomposition method is used to optimize power allocation and function extremum method is used to optimize time allocation. Simulation results show that the sum rate of the dual STAR-RIS-assisted NOMA system is higher than that of the single STAR-RIS-assisted NOMA system.
- Non-Orthogonal Multiple Access (NOMA) /
- Simultaneously Transmitting And Reflecting Reconfigurable Intelligent Surface (STAR-RIS) /
- Sum rate /
- Power /
- Phase shift

HTML全文

图 1 双STAR-RIS辅助的下行NOMA系统

下载: 全尺寸图片幻灯片

图 2 迭代次数图

下载: 全尺寸图片幻灯片

图 3 双STAR-RIS反射元素数量改变时系统的和速率

下载: 全尺寸图片幻灯片

图 4 发射功率$ {P_{{\text{max}}}} $改变时系统的和速率

下载: 全尺寸图片幻灯片

表 1 仿真参数

参数	数值
BS与STAR-RIS₁路径损耗指数	2
BS与STAR-RIS₂路径损耗指数	2
STAR-RIS₁与用户T/R路径损耗指数	2
STAR-RIS₂与用户C/R路径损耗指数	2
莱斯因子(dB)	5
用户R、用户T、用户C数目	2,2,2
BS与两个STAR-RIS距离(m)	50,50
STAR-RIS₁与用户T/R距离(m)	10
STAR-RIS₂与用户C/R距离(m)	10
噪声功率$ {\sigma ^2} $(dBm)	–99
$ {R_{\min}} $(bit/(s·Hz))	0.1

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参考文献(15)

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