The paper introduces the modulation and demodulation theory of / 4 - dqpsk . recommended pulse shaping filter and bit synchronization detailed . then author use matlab software to simulate the whole process of modulation and demodulation and use verilog hardware description language to design the module 本文中介紹了/ 4 - dqpsk的調(diào)制解調(diào)原理,著重介紹了成形濾波器,位同步實現(xiàn),并對調(diào)制解調(diào)的全過程進行matlab仿真并用verilog硬件描述語言設(shè)計實現(xiàn)各個模塊。