To meet the requirements of electromagnetic(EM)theory and applied physics,this study presents an overview of the state-of-the-art research on obtaining the EM properties of media and points out potential solutions tha...To meet the requirements of electromagnetic(EM)theory and applied physics,this study presents an overview of the state-of-the-art research on obtaining the EM properties of media and points out potential solutions that can break through the bottlenecks of current methods.Firstly,based on the survey of three mainstream approaches for acquiring EM properties of media,we identify the difficulties when implementing them in realistic environments.With a focus on addressing these problems and challenges,we propose a novel paradigm for obtaining the EM properties of multi-type media in realistic environments.Particularly,within this paradigm,we describe the implementation approach of the key technology,namely“multipath extraction using heterogeneous wave propagation data in multi-spectrum cases”.Finally,the latest measurement and simulation results show that the EM properties of multi-type media in realistic environments can be precisely and efficiently acquired by the methodology proposed in this study.展开更多
Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This pa...Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This paper investigates the human body RCS at 26 GHz via multiangle channel measurements under different clothing conditions.Based on calibrated electromagnetic(EM)parameters,the RCS characteristics of the human body in far-field conditions are analyzed using ray-tracing(RT)simulations.Some suggestions for the design of ISAC systems are also discussed.The results provide a solid theoretical foundation and practical reference for the modeling of target scattering characteristics for ISAC channels.展开更多
With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the...With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the existing channel model is hard to meet the demands of the sensing function.The radar-cross-section(RCS)is a critical feature for the sensing part,while accurate RCS data for the typical frequency band of ISAC are still lacking.Therefore,this paper conducts measurements and analysis of the RCS data of the unmanned aerial vehicles(UAVs)under multiple poses and angles in real flying conditions.The echo from a UAV is acquired in an anechoic chamber,and the RCS values are calculated.The results of different flying attitudes are analyzed,providing RCS features for the ISAC applications.展开更多
为了解决铁路移动通信网络规划成本高且效率低的问题,满足铁路智能无线网络建设需求,以京沈客运专线为场景,研究了2.1 GHz频段下基于高性能射线跟踪的5G铁路专用移动通信(5G for railway, 5GR)智能无线网络规划技术.依托参考信号接收功...为了解决铁路移动通信网络规划成本高且效率低的问题,满足铁路智能无线网络建设需求,以京沈客运专线为场景,研究了2.1 GHz频段下基于高性能射线跟踪的5G铁路专用移动通信(5G for railway, 5GR)智能无线网络规划技术.依托参考信号接收功率(reference signal receiving power, RSRP)高性能射线跟踪仿真得到电磁波在特定环境下传播时的信道特性和路径损耗,进而精准预算无线链路的RSRP和下行传输速率;同时将规划问题建模为多目标优化求解问题,使用遗传算法对基站参数进行分级规划,在RSRP覆盖达标的前提下,最大化下行传输速率,智能输出基站工参最优解.仿真结果表明该技术可以满足RSRP覆盖率和最大化下行传输速率的规划目标,为后续实现精准高效的5G-R无线网络规划和优化提供仿真支撑和参考.展开更多
为推进智能铁路总体建设,助力铁路数字化转型,基于5G的铁路专用移动通信系统(5G for Railway,5G-R)成为铁路智能联接的首选.作为最具发展潜力的B5G关键技术之一,智能超表面(Reconfigurable Intelligent Surface,RIS)具有复杂度低、成本...为推进智能铁路总体建设,助力铁路数字化转型,基于5G的铁路专用移动通信系统(5G for Railway,5G-R)成为铁路智能联接的首选.作为最具发展潜力的B5G关键技术之一,智能超表面(Reconfigurable Intelligent Surface,RIS)具有复杂度低、成本低和易于部署等优点,为5G智能高铁(High-Speed Railway,HSR)通信的发展提供了新契机.采用射线跟踪技术,精准刻画了2.1GHz频段下高铁高架桥场景的电波传播特性.基于准确的电波传播特性,利用发射机、反射面和接收机三者之间的角度关系,对RIS的部署位置和波束指向进行了设计.在获得RIS辅助下的信道传递函数后,对部署RIS前后的多维度信道特性进行了比较和研究.结果表明:引入RIS能够提升信号覆盖质量,加剧多径信号在时间域和空间域的色散程度,降低2T2R信道间的相关性,从而提高信道容量.本文研究成果可为高铁通信场景下5G-R系统与RIS的联合设计、优化提供理论指导和数据支撑.展开更多
基金supported by the Beijing Natural Science Foundation(No.L212029)the National Natural Science Foundation of China(No.62271043).
文摘To meet the requirements of electromagnetic(EM)theory and applied physics,this study presents an overview of the state-of-the-art research on obtaining the EM properties of media and points out potential solutions that can break through the bottlenecks of current methods.Firstly,based on the survey of three mainstream approaches for acquiring EM properties of media,we identify the difficulties when implementing them in realistic environments.With a focus on addressing these problems and challenges,we propose a novel paradigm for obtaining the EM properties of multi-type media in realistic environments.Particularly,within this paradigm,we describe the implementation approach of the key technology,namely“multipath extraction using heterogeneous wave propagation data in multi-spectrum cases”.Finally,the latest measurement and simulation results show that the EM properties of multi-type media in realistic environments can be precisely and efficiently acquired by the methodology proposed in this study.
基金supported by the National Natural Science Foundation of China under Grant No.62271043Ministry of Education of China under Grant No.8091B032123Beijing Natural Science Foundation under Grant No.L212029。
文摘Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This paper investigates the human body RCS at 26 GHz via multiangle channel measurements under different clothing conditions.Based on calibrated electromagnetic(EM)parameters,the RCS characteristics of the human body in far-field conditions are analyzed using ray-tracing(RT)simulations.Some suggestions for the design of ISAC systems are also discussed.The results provide a solid theoretical foundation and practical reference for the modeling of target scattering characteristics for ISAC channels.
基金supported by ZTE Industry-University-Institute Cooperation Funds under Grant No.HC-CN-20220622006。
文摘With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the existing channel model is hard to meet the demands of the sensing function.The radar-cross-section(RCS)is a critical feature for the sensing part,while accurate RCS data for the typical frequency band of ISAC are still lacking.Therefore,this paper conducts measurements and analysis of the RCS data of the unmanned aerial vehicles(UAVs)under multiple poses and angles in real flying conditions.The echo from a UAV is acquired in an anechoic chamber,and the RCS values are calculated.The results of different flying attitudes are analyzed,providing RCS features for the ISAC applications.
文摘为了解决铁路移动通信网络规划成本高且效率低的问题,满足铁路智能无线网络建设需求,以京沈客运专线为场景,研究了2.1 GHz频段下基于高性能射线跟踪的5G铁路专用移动通信(5G for railway, 5GR)智能无线网络规划技术.依托参考信号接收功率(reference signal receiving power, RSRP)高性能射线跟踪仿真得到电磁波在特定环境下传播时的信道特性和路径损耗,进而精准预算无线链路的RSRP和下行传输速率;同时将规划问题建模为多目标优化求解问题,使用遗传算法对基站参数进行分级规划,在RSRP覆盖达标的前提下,最大化下行传输速率,智能输出基站工参最优解.仿真结果表明该技术可以满足RSRP覆盖率和最大化下行传输速率的规划目标,为后续实现精准高效的5G-R无线网络规划和优化提供仿真支撑和参考.
