摘要
为评估铁路高架桥场景下无线通信系统性能,需建立能准确描述该系统小尺度和大尺度特性的信道模型。首先,建立高架桥场景下椭圆单环模型;其次,将莱斯K因子建模为与高架桥高度有关的函数,两者结合得到一种多跳随机信道模型,并对其进行非平稳性验证;然后,为扩大无线通信覆盖范围,采用在基站侧交错部署多个射频远端单元、在列车上部署多个车载移动中继的方式,形成大规模分布式多输入多输出(MIMO),在此架构下分析天线系统、射频远端单元、车载移动中继站的分布以及高架桥高度对信道容量的影响;最后,对该信道模型进行仿真测试。仿真结果验证了大规模分布式MIMO和车载移动中继系统具有的优势,并显著提高了信道容量。
In order to evaluate the performance of the wireless communication system in the railway viaduct scenario,it is necessary to establish a channel model that can accurately describes the smallscale and large-scale characteristics of the system.Firstly,the elliptical single-ring model in the viaduct scene is established.Then,the Rice K-factor is modeled as functions related to the height of the viaduct.By combining the two kinds of models,a multi-bounced stochastic channel model is obtained,and its non-stationarity is verified.Then,in order to expand the coverage of wireless communication,a large-scale distributed Multiple Input Multiple Output(MIMO)was formed by staggered deployment of multiple RF remote units on the base station side and multiple on-board mobile relays on the train.Under this framework,the influence of the antenna system,the distribution of remote radio units,the distribution of mobile relay stations and the height of the viaduct on the channel capacity are analyzed.Finally,the model is simulated and tested,and the simulation results demonstrate the advantages of a massively distributed MIMO and vehicle-mounted mobile relay system,which significantly increases the channel capacity.
作者
邵宇龙
王海龙
王东明
宋铁成
陈建平
SHAO Yulong;WANG Hailong;WANG Dongming;SONG Tiecheng;CHEN Jianping
出处
《铁道通信信号》
2023年第10期35-43,共9页
Railway Signalling & Communication
基金
中国国家铁路集团有限公司科技研究开发计划系统性重大课题(P2020G004)。
