Firstly, ALE system's base content is introduced, then an analysis of ALE system's structure and design is put forward, and then 8cpfsk modulation theory and error control technique are discussed.

本文首先介绍了ALE协议的基本内容，分析了ALE系统的结构和设计思路，然后对8cpfsk信号的调制解调技术、差错控制技术进行了理论研究。

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