一种基于CPLD的π/4-DQPSK调制器的设计与实现

Design and Realization of a π/4-DQPSK Modulator Based on CPLD

根据π/4-DQPSK信号的特点,对它的调制实现方法进行了研究.在研究的基础上,提出了一种用VHDL语言设计实现π/4-DQPSK调制器的设计方案.详细叙述了其工作原理及设计思想,用复杂可编程逻辑器件CPLD实现了映射编码和逻辑选相,在D/A转换器等配合下实现了π/4-DQPSK调制并给出了用复杂可编程逻辑器件CPLD实现部分的仿真波形.

Based on the characteristics of π/4-DQPSK signal, the method of this signal modulated is explored. A new design method for a π/4-DQPSK modulator is introduced. In this paper we discuss its design consideration and operational principle in detail. In this method we carry out the mapping coding and selecting phase for the modulator with the complex programmable logic device （CPLD）, and carry out π/4-DQPSK signal modulator with the aid of D/A convert and other devices. The simulation results for the part constructed by CPLD in the modulator are also presented.