QPSK的锁相环程序，在MATLAB环境下编写的，用来进行QPSK通信系统的仿真和实际信号载波同步的提取-QPSK PLL program, written in the MATLAB environment, QPSK communication system used for simulation and the actual extraction of the signal carrier synchronization

Pre designed QPSK demodulator (can choose to use PLL or signal generator to demodulate)

单载波 BPSK QPSK调制下的PLL功能实现 实现频率相位的跟踪-Single carrier BPSK QPSK modulation the PLL frequency phase tracking

锁相环的工作模式：单载波为“1”、BPSK调制为“2”、QPSK调制为“3” 对其进行仿真 修改可用于高动态-The PLL operating modes: single-carrier is "1", and the BPSK modulation is "2", the QPSK modulation is "3." Its simulation modifications can be used for high dynamic