基于随机几何的变电站无线通信信道模型

Wireless Communication Channel Model and Characteristics of Substation Based on Geometry-based Stochastic Model

无线通信技术与变电站紧密融合,是保障变电站正常运行的重要因素之一。由于变电站电气设备密集多样、移动通信终端信号传输路径复杂,传播特性有别于经典无线通信场景。为此,基于随机几何建模法(geometry-based stochastic model,GBSM),从变电站实际场景出发,将其抽象为圆形栅柱的几何模型;模拟设备密集区域视距(line of sight,LOS)分量少的现象,设置LOS与非视距(non-line of sight,NLOS)子区,推导模型的空时相关函数(space-time correlation function,ST-CF),空间互相关函数(cross-correlation functions,CCF)和时间自相关函数(auto-correlation functions,ACF)的数学表达式,搭建出适用于变电站室外典型结构的随机几何信道模型。参考模型与仿真模型结果验证了该3D圆形栅柱随机几何模型具有可行性。实验结果表明LOS、散射体分布和多普勒效应对变电站室外无线信道特性有较大影响。

ed into the circular grid co-lumn geometric model based on the method of geometry-based stochastic model(GBSM).To simulate the phenomenon of less LOS component in equipment intensive areas,line of sight(LOS)and non-line of sight(NLOS)sub areas were set up,the mathematical expressions of space-time correlation function(ST-CF),spatial cross-correlation function(CCF)and time auto-correlation function(ACF)of the model are derived,and built the GBSM 3D channel model model suitable for typical outdoor structures of substations.The feasibility of the 3D GBSM of circular grating was verified by the results of reference model and simulation model.It is demonstrated that LOS,scatterer distribution and Doppler effect have great influence on the outdoor wireless channel characteristics of substation.