基于5GHz无线局域网的车地无线通信系统测试与分析

摘要

Train/ground wireless communication system is an important part of data transmission in passenger information system (PIS),it plays a vital role in PIS application.Beijing subway Line 5 passenger information system now uses 2.4 GHz WLAN based train/ground wireless communication system with defects like small bandwidth and low rate.To solve these problems,the 802.11n-based 5 GHz band train/ground wireless network technology is proposed to replace the existing system.To verify the performance and effectiveness of the new technology,a ground simulation system is designed and built,a car is used as the substitute of subway train.The test results indicate that the performance of 5 GHz band wireless network could meet the requirements of passenger information system,and achieve the desired result.%车地无线通信系统是乘客信息系统进行数据传输的重要组成部分,其对乘客信息系统的使用效果起着至关重要的作用.现有北京地铁5号线乘客信息系统采用的基于2.4 GHz WLAN(无线局域网)的车地无线通信系统存在着带宽小、速率低等不足.针对这些不足,提出使用5 GHz频段的基于802.11 n技术车地无线网络替代现有网络.为了验证新技术的性能及有效性,设计并搭建了地面模拟系统,使用汽车替代地铁列车进行了测试.试验结果表明,使用5 GHz频段车地无线网的性能能够满足乘客信息系统的要求,达到了预期的效果.