通信系统仿真大作业，卷积码编码，QPSK调制，接收端维特比软判决。程序正确。-Communication system simulation a large operation, convolution coding, QPSK modulation, soft-decision Viterbi receiver. Program is correct.

一个简单的直扩系统，包含卷积编译码，BPSK调制，M序列扩频-A simple DS system, including the convolution coding and decoding, BPSK modulation, M-sequence spread spectrum