QPSK调制解调系统的设计与仿真  

Design and Simulation of QPSK Modulation and Demodulation System

作　　者：孙会楠[1] 邢彦辰[1] SUN Huinan;Xing Yanchen(School of Electronic and Information Engineering,Harbin Huade University,Harbin 150025,China)

机构地区：[1]哈尔滨华德学院电子与信息工程学院,黑龙江哈尔滨150025

出　　处：《太原学院学报（自然科学版）》2020年第2期51-58,共8页Journal of TaiYuan University:Natural Science Edition

摘　　要：给出QPSK调制解调系统的整体方案设计,在调制系统中详细描述了成形滤波器和调制端NCO的设计过程,并仿真出成形滤波器波形图和频谱图。在解调系统中选择了松尾环载波同步与Gardner插值位同步作为实现相干解调的系统方案的理论,并对环路中的基带鉴相器、环路滤波器、内插滤波器等模块的原理和设计过程进行了详细清晰的阐述,同时对鉴相特性、环路滤波器和插值分数间隔参数开展了详尽的计算与仿真,确保在之后的理论仿真与硬件实现中能够满足设计要求。The whole scheme design of QPSK modulation and demodulation system is given.In the modulation system,the design process of shaping filter and NCO at the modulation end is described in detail,and the waveform and spectrum of shaping filter are simulated.In the demodulation system,the theory of loose tail loop carrier synchronization and Gardner interpolation bit synchronization is selected as the system scheme to realize coherent demodulation,and the principle and design process of baseband phase detector,loop filter,interpolation filter and other modules in the loop are explained in detail.Meanwhile,the phase characteristics,loop filter and interpolation fractional interval parameters are calculated in detail And simulation,to ensure that in the later theoretical simulation and hardware implementation can meet the design requirements.

关 键 词：QPSK 载波同步 位同步 松尾环 Gardner插值 

分 类 号：TH77[机械工程—仪器科学与技术]