基于FPGA的QDPSK调制器的设计与实现  

Design and realization of QDPSK modulator based on FPGA

作　　者：刘国华[1] 李二喜[1] 

机构地区：[1]株洲职业技术学院,湖南株洲412008

出　　处：《电子设计工程》2011年第9期22-25,共4页Electronic Design Engineering

摘　　要：介绍了QDPSK信号的优点,并分析了其实现原理,提出一种QDPSK高性能数字调制器的FPGA实现方案。采用自顶向下的设计思想,将系统分成串/并变换器、差分编码器、逻辑选相电路、四相载波发生器等4大模块,用原理图输入、VHDL语言设计和调用PLL核相结合的多种设计方法,分别实现了各模块的具体设计,并给出了其在Quar-tusⅡ环境下的仿真结果。结果表明,基于PLL的QDPSK调制器,设计简单,便于修改和调试,性能稳定。This article first introduced the advantage of QPSK and analyzed the implementation principle, then proposed a high-preformanee QDPSK digital modulator＇s implementation method based on FPGA. By using top-to-down design, the system was divied into four modules, serial/parallel conversion, differentiate eneoder, logic phase selection circuit and four-phase carrier generator. And it respectively achieved the specific design of each module by schematic, VHDL, and PLL core The simulation and experiment of FPGA design were given with Quartus Ⅱ. Result shows that the QDPSK modulator based on PLL is simple to design, convenient to modify or debug, and it operates stable.

关 键 词：QDPSK 串/并变换 数字调制器 FPGA 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论] TN919[自动化与计算机技术—计算机科学与技术]