基于IIR滤波器的costas环的simulink实现，区别于不同的costas环，可以实现通信系统的载波同步，可以直接在matlab上打开实现，对于通信系统的同步问题的学习和设计-IIR filter based on simulink realization of costas loop, different from the various costas loop, carrier communication system can be achieved simultaneously, you can open directly in matlab implementation, the synchronization of communication systems for the study and design