影响微波数字传输系统可靠性的一个极重要的因素是大气传播异常现象引起的多径干扰。这种干扰在微波高速数字系统中表现为严重的选择性衰落,但对低速系统无明显影响。本文就“最小相位”和“非最小相位”两种选择性衰落状态对系统的影响进行了分析,提出了两种提高传输可靠性的方法,并通过计算机模拟作了验证。 One of the most important factors affecting the reliability of microwave digital transmission systems is the multipath interference caused by the atmospheric propagation anomalies. This interference manifests itself as a severe selective fading in microwave high-speed digital systems but has no significant effect on low-speed systems. In this paper, the impact of two selective fading states, “minimum phase” and “non-minimum phase”, on the system is analyzed. Two methods to improve the transmission reliability are proposed and verified by computer simulation.