摘要
结合广播线载波通信的特点,阐述了正交频分复用(OFDM)的原理及其在铁路列车广播线上的应用,充分考虑了多径传播、频率和长度对衰减的影响,给出了正交频分复用系统在衰落信道中的通用系统模型,同时考虑了驻波现象的存在使得某些距离的衰减出现极大值或极小值,在过零处干扰最小的影响,使数据传输准确,且误码率较低,更具实用价值。
Combining with the characteristic of the carrier wave communication on broadcasting line, The principle of OFDM and application on the train broadcasting line are expatiated. The multi way of transition,frequency and length affect to the system is fully considered. The orthogonal frequency divid multiplex system to the general system model in reduced signal channel is introduced. The max or the minimum of the attenuation on any distance because of exist of standing wave phenomena is also considered. There is minimal influence at zero- crossing,it makes transmission of the date precise,has low Bit Error Rate and has more practical value.
出处
《现代电子技术》
2007年第9期11-13,共3页
Modern Electronics Technique
关键词
0FDM
广播线
衰减
过零点
OFDM
broadcasting line
attenuation
zero - crossing
