说明：  用Simulink搭建的DQPSK调制与解调的完整系统，包含了串并转换，差分编解码等关键技术，对理解DQPSK的基本原理有很大的帮助。
(Complete system with the DQPSK modulation and demodulation Simulink built, comprising a serial-parallel conversion, encoding and decoding differential key technologies, a great help for understanding the basic principle of the DQPSK.)