基于TD-LTE的隧道无线传播模型校正研究

Correction of Tunnel Radio Propagation Model based on TD-LTE

鉴于TD-LTE无线通信系统相较于WLAN具有更稳定的通信优势,将其引入城市轨道交通CBTC系统中,但其在无线网络规划过程中仍存在传播路径损耗预测的准确性问题。通过分析常见的无线传播模型及隧道无线传播环境,采用加权最小二乘法对ITU-R P.1238模型进行校正,得到了适用于城市轨道交通隧道环境的无线传播损耗模型。对实验数据分区域仿真,得出校正后的传播模型路径损耗曲线优于校正前,更适合为无线网络规划提供参考及路径损耗的估算。

In view of its more stable communication advantages as compared with WLAN,TD-LTE wireless communication system is introduced into the urban rail transit CBTC system.However,the accuracy problem of propagation path loss prediction still exists in the wireless network planning.Based on analysis of the common wireless propagation model and the tunnel wireless communication environment,the weighted least squares method is adopted to correct the ITU-R P.1238 model,and thus the radio propagation loss model for urban rail transit tunnel environment is acquired.The simulation of experimental data indicates that the path loss curve of the corrected propagation model is better than that before the correction,and this is more suitable for wireless network planning reference and path loss estimation.