摘要
从电波小尺度衰落的形成和影响因素出发,研究现场试验中测试电波小尺度衰落的方法。根据列车无线通信系统参数确定小尺度衰落统计参数,并利用数理统计方法对测试数据进行分析,建立电波小尺度衰落数学模型。计算分析结果表明:衰落频度与速度成线性关系;衰落宽度与速度成反比关系;衰落深度随速度的增加而略有下降;衰落余量随电波频率的增加而增加。
Starting from the formation and influence factors of radio small-scale fading, this paper introduces the testing method of radio small-scale fading in actual test. According to the parameters of train radio communication system, the statistic parameters are confirmed. The test data are analyzed with mathematical statistics method. At the same time, the small-scale fading mathematical model is built. Calculation results indicate that the fading frequency is linear with the speed; the fading width is inversely proportional to the speed; the fading amplitude drops slightly with the increase of the speed; and the fading residency increases with the increase of radio frequency.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2004年第3期97-102,共6页
China Railway Science
基金
铁道部科技研究开发计划项目(2002X003 E)
关键词
高速铁路
信号
小尺度衰落
电波传播
Electric inverters
Fading (radio)
Radio waves
Sampling
Signal processing
Speed control
Statistical methods
