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本文针对采用高调制状态数的ＳＤＨ数字微波通信系统，介绍了用以对抗频率选择性衰落的各种技术，并论述了其在通信系统中所起的作用和地位。
In this paper, aiming at the SDH digital microwave communication system with high modulation states, various techniques to combat frequency selective fading are introduced, and their roles and status in communication systems are discussed.