一个基本的多线程的文件网络传输系统，非常适合初学者，分析里面的代码，大有裨益。-A basic network of multi-threaded file transfer system, is ideal for beginners, of which the code is of great benefit.

Ideal channel sender program and receiver program-The Ideal channel sender program and receiver program

多径信道仿真 有三条固定路径的AWGN多径信道的QPSK系统进行BER性能方针,并与在理想的AWGN信道中同样系统的BER进(Multipath channel simulation QPSK system with three fixed paths for AWGN multipath channel carries out BER performance policy, and the same system BER advance as in ideal AWGN channel)