假定接收端已经实现载波同步，位同步（盲信号解调重点要解决的问题：载波同步（costas环（未见到相关代码）），位同步（Gardner算法（未见相关代码）），帧同步）-Generating QPSk signal, assuming that the receiver has to achieve carrier synchronization, bit synchronization (blind signal demodulation focus to solve the problem: c