摘要
基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向.正交频分复用OFDM)是一种无线环境下的高速传输技术,它对高速列车控制信息传输中主要受到的由于多径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和基本原理,然后在计算机上用Matlab对其性能进行了仿真,仿真中将OFDM与传统的单载波调制方式———正交振幅调制(16 QAM)对抗多径干扰的性能进行了比较,最后分析了二者的仿真结果.
Communication Based Train Control(CBTC) is the trend of the railway signaling. Orthogonal Frequency Division Multiplexing(OFDM) is the modulation technique for wireless communications. OFDM is especially suitable for high_speed train control communication due to its resistance to the multipath interference. This paper introduces the development, application and principle about OFDM firstly. Secondly the OFDM technique simulation performance using Matlab, and in order to compare OFDM to a traditional single carrier communication system, a Quadrature Amplitude Modulation(16_QAM) simulation can be performed. Finally the paper analyses and compares their simulation results.
出处
《北方交通大学学报》
CSCD
北大核心
2004年第3期95-98,共4页
Journal of Northern Jiaotong University
关键词
通信传输技术
正交频分复用
计算机仿真
正交振幅调制
communication transmission
orthogonal frequency division multiplexing
computer simulation
quadrature amplitude modulation
