不同的无线通信协议实现不同的调制方案。
Different wireless communication protocols implement different modulation schemes.
协议定义了在选定的模式下面调制解调器将如何工作。
The Protocol Selection defines how the modem will operate within this mode.
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。
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.
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