北京交通大学学报2025，Vol.49Issue(3)：147-156,10.DOI:10.11860/j.issn.1673-0291.20240066
RIS辅助高铁毫米波无线通信多普勒频移补偿技术
Doppler shift compensation techniques for RIS-assisted millimeter-wave wireless communications in high-speed railways
摘要
Abstract
In reconfigurable intelligent surface(RIS)-assisted millimeter-wave(mmWave)wireless communication systems for high-speed railways,the RIS-assisted Doppler shift compensation tech-niques are investigated to address the frequency shift caused by the Doppler effect of electromagnetic waves in highly dynamic,high-speed environments.First,based on a time-varying 3D Saleh-Valenzuela mm Wave channel model,an expression for the Doppler shift is derived,and an optimal RIS phase shift matrix is designed with the objective of compensating for the Doppler shift in the cas-caded transmission link.Next,considering errors in vehicle speed estimation,the speed estimation er-ror and its Probability Density Function(PDF)are analyzed,from which the residual Doppler error is computed,and its impact on the study is discussed.Finally,to evaluate the performance of the com-pensated system,analytical expressions for Spectral Efficiency(SE)and outage probability(OP)are derived,and simulation experiments are conducted to validate the effectiveness of the approach.Simu-lation results show that minimizing the Doppler shift,instead of maximizing received power,can com-pletely eliminate the Doppler shift.When the number of RIS is 322 and the base station antenna height is 50 m,the SE increases by 5.87 bit/(s·Hz)when the train approaches the RIS.Additionally,when the height of the base station antenna is 30 m,50 m and 70 m,the OP varies between 5× 10-3 and 6×10-3.关键词
可重构智能超表面/高铁毫米波无线通信/多普勒频移补偿/相移矩阵优化Key words
reconfigurable intelligent surface/high-speed railway mm Wave communications/Doppler shift compensation/phase shift matrix optimization分类
交通工程引用本文复制引用
马铂琳,甄姬娜,张昶,申凌峰,杨靖雅,王宁..RIS辅助高铁毫米波无线通信多普勒频移补偿技术[J].北京交通大学学报,2025,49(3):147-156,10.基金项目
国家自然科学基金(61771431,62101507) （61771431,62101507）
毫米波全国重点实验室开放课题(K202214) （K202214）
北京市高速铁路宽带移动通信工程技术研究中心开放课题(BHRC-2022-2) （BHRC-2022-2）
河南省科技攻关计划项目(202102210328)National Natural Science Foundation of China(61771431,62101507) （202102210328）
Open Fund of the State Key Laboratory of Millime-ter Waves(K202214) （K202214）
Open Research Fund of Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications(BHRC-2022-2) （BHRC-2022-2）
Henan Province Science and Technology Key Research Project(202102210328) （202102210328）
