北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2025, Vol. 48 ›› Issue (1): 79-86.

• 论文 • 上一篇    下一篇

IRS 辅助无线供电通信网络的最小用户速率最大化优化算法

雷维嘉,  张 童,  雷宏江,  唐 宏   

  1. 重庆邮电大学
  • 收稿日期:2023-10-26 修回日期:2023-11-26 出版日期:2025-02-26 发布日期:2025-02-25
  • 通讯作者: 雷维嘉 E-mail:leiwj@cqupt.edu.cn
  • 基金资助:
    国家自然科学基金项目

Minimum User Rate Maximization Optimization Algorithm for IRS Assisted Wireless Powered Communication Network

LEI Weijia,  ZHANG Tong,  LEI Hongjiang,  TANG Hong   

  • Received:2023-10-26 Revised:2023-11-26 Online:2025-02-26 Published:2025-02-25
  • Contact: Wei-Jia LEI E-mail:leiwj@cqupt.edu.cn

摘要: 针对智能反射表面(IRS)辅助的无线供电通信网络,为了在提高系统整体传输速率的同时兼顾用户服务的公平性,提出了以最大化最小用户传输速率为目标,联合优化混合接入点波束赋形、上下行时间分配、用户发送功率以及IRS相移矩阵的优化算法。原始优化问题为多变量耦合的非凸问题,利用引入松弛变量、半定松弛等方法对原问题进行转换,再利用黄金分割搜索、逐次凸逼近、交替迭代优化等方法进行求解。仿真结果显示,相较于以系统和速率最大化为目标的优化算法,所提算法的最小用户速率明显更高,用户间服务公平性显著改善;而与没有使用IRS的算法相比,所提算法的最小用户速率与系统和速率都更高,且随IRS单元数增加性能优势增大,表明IRS能有效提升能量和信息的传输效率。

关键词: 智能反射表面 , 无线供电通信网络 , 波束赋形

Abstract: To improve the overall system transmission rate while ensuring fairness among users in intelligent reflecting surface ( IRS) assisted wireless powered communication network, an optimization algorithm is proposed that jointly optimizes hybrid access point beamforming, uplink-downlink time allocation, user transmission power, and IRS phase shift matrix, with the objective of maximizing the minimum user transmission rate. The original non-convex optimization problem with coupled variables is transformed using relaxation variables and semi-definite relaxation. Methods such as golden section search, successive convex approximation, and alternating iterative optimization are then applied to solve it. Simulation results indicate that, compared with the algorithm aiming to maximize the sum rate, the proposed algorithm significantly improves the minimum user rate and enhances fairness among users. Additionally, compared to the algorithm without IRS, the proposed algorithm achieves higher minimum user rates and system sum rates, with performance improving as the number of IRS elements increases, indicating that IRS effectively enhances both energy and information transmission efficiency.

Key words: intelligent reflecting surface , wireless powered communication network , beam forming

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