摘要
本文针对工业环境中无线莱斯(Rician)多径衰落信道导致的数据传输时延不确定性问题,研究了如何利用可重构智能超表面(reconfigurable intelligent surface,RIS)技术调控通信环境,减少传输时延的抖动,从而为工业控制系统等时间敏感型应用提供更优质的通信服务.本文以减少时延分布的离散程度为目标,构建了融合RIS技术的工业环境无线莱斯信道模型,分析了发射功率和RIS相位对传输时延分布的影响,提出了一种通过调节RIS相位来优化通信时延概率密度函数(probability density function,PDF)的相位一致算法.证明了在信道状态已知的理想情况下,该相位一致算法能够在任意给定发射功率下得到RIS相位的理论最优解和传输时延方差的理论最小值.针对实际工业环境中信道状态未知的情况,本文进一步提出了一种基于遗传算法的相位优化算法,通过迭代方式使传输时延PDF接近理论最优解.仿真结果表明,通过RIS调控信道,在相同发射功率下,传输时延的均值可减少7.7%~30.9%,方差可减少74.3%~87.4%,具有绿色节能的优势.
This paper addresses the issue of data transmission delay uncertainty caused by wireless Rician multipath fading channels in industrial environments.It explores how reconfigurable intelligent surface(RIS)technology can regulate the communication environment,reduce transmission delay jitter,and provide higher-quality communication services for time-sensitive applications such as industrial control systems.Aiming to reduce the dispersion of delay distribution,this paper builds a wireless Rician channel model in industrial environments with RIS technology.It analyzes the infuences of transmit power and RIS phase on transmission delay distribution.A phase alignment algorithm is proposed to optimize the communication delay probability density function(PDF)by adjusting the RIS phase.It has been proven that the phase alignment algorithm can obtain the theoretical optimal solution of the RIS phase and the theoretical minimum of transmission delay variance at any given transmit power under the ideal condition of a known channel state.Considering the unknown channel state in practical industrial environments,this paper proposes a genetic algorithm-based phase optimization method,approximating the transmission delay PDF to the theoretically optimal solution.Simulation results show that by regulating the channel using RIS,the mean transmission delay can be reduced by 7.7%to 30.9%,and the variance can be reduced by 74.3%to 87.4%,demonstrating significant green energy-saving advantages.
作者
刘辉
代学武
秦飞
肖玉聪
赵晓华
Hui LIU;Xuewu DAI;Fei QIN;Yucong XIAO;Xiaohua ZHAO(State Key Laboratory of Synthetical Automation for Process Industries,Northeastern University,Shenyang 110819,China;School of Electronic and Communication Engineering,University of Chinese Academy of Sciences,Beijing 101408,China;Unisplendour MCCo.,Ltd.,Tianjin 300308,China)
出处
《中国科学:信息科学》
北大核心
2025年第2期388-400,共13页
Scientia Sinica(Informationis)
基金
科技创新2030—“新一代人工智能”重大项目(批准号:2022ZD0115402)
国家自然科学基金项目(批准号:62071450,61773111)
黑龙江省“百千万”工程科技重大专项(批准号:2020ZX03A02)资助。
关键词
多径衰落
可重构智能超表面
通信时延
概率密度函数
相位一致算法
multipath fading
reconfigurable intelligent surface(RIS)
communication delay
probability density function(PDF)
phase alignment algorithm
