The wireless channel is usually unreliable, and it mainly suffers from time-varying fading due to multi-path propagation.

它具有由于时变多径传输产生的衰落、时间延迟扩展等有害影响。

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The problems mainly exhibit to be multi-path propagation in the wireless fading channel, signal fading caused by the scattering and Inter-Symbol Interference caused by the long multi-path time delay.

其中主要为无线衰落信道中的多径传播和散射引起的信号衰落，以及大的多径时延而引起的符号间干扰。

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A typical model to simulate the multi path effects up to three different propagation paths was introduced, more paths 'simulation can be implemented by increasing the number of same units.

介绍了一个模拟最多三个不同传播路径的典型多径效应模型，通过增加相同的单元数目可以实现更多路径的模拟。

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