然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；
Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;
在此基础上对高速铁路的电波传播特性进行了小尺度衰落特性的研究分析。
On the base of this channel, we analyze the characteristics of the radio wave small-scale fading.
微区电波传播特性分析模型多是理论模型，采用射线追踪法，对源辐射情况进行模拟。
Most propagation models , which can be adapted micro cellcluar are theory method based on ray tracing method.
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