一个小的显示MODEM的安装写入程序，有一些基本的东西。-Showed a small write MODEM installation procedures, there are some basic things.

3本非常详细的AT指令书，这每一每书有独特的知认，会让你找到你想要的东西的-3 This very detailed book AT commands, which each has a unique knowledge of each book are identified, will let you find things you want

数字通信中经常用到的几种调制方式仿真，包括ASK调制，OOK调制，FSK调制，BPSK调制等，将该代码理解透彻能够对数字系统中的调制解调方式有着更深入的认识，绝对的好东西，有时间会效代码中的各条语句添加上注释-Frequently used in digital communication several modulation simulation, including the ASK modulation, OOK modulation, FSK modulation, BPSK modula