基于软件无线电技术的单载波QDPSK解调算法  

A scheme to demodulate single carrier QDPSK signals in software radio

作　　者：吴志敏[1] 龙鹏飞[1] 肖大光[2] 

机构地区：[1]长沙理工大学计算机与通信工程学院,湖南长沙410076 [2]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《长沙理工大学学报（自然科学版）》2007年第4期64-67,共4页Journal of Changsha University of Science and Technology:Natural Science

基　　金：湖南省教育厅科研资助项目(06C115)

摘　　要：提出一种基于软件无线电技术的单载波四相差分相移键控信号数字化解调方案.该方案考虑到接收信号的每个码元区分为过渡区和稳定区,从而仅对稳定区内载波周期中的采样值进行离散傅立叶变换来实现解调,位同步也可以采用离散傅立叶变换提取载波幅值来实现.仿真结果表明,该方法不仅解调过程简单,计算量小,且抗干扰性能也得到了改善,可望在采用四相差分相移键控信号的数字化接收机设计中得到应用.A demodulation scheme for single carrier QDPSK signals based on software radio technology is proposed.As every yard wave can be divided into transition section and steady section,we can make DFT with samples of several carrier cycles only in steady section to demodulate it.Bit synchronization can be realized by making DFT to get the carrier amplitude.The simulation result shows that the process is simple with less computation and noise-resisting property is improved.This method is expected to be used in the design of QDPSK signal digital receiver.

关 键 词：软件无线电 数字化解调 四相差分相移键控 离散傅立叶变换 

分 类 号：TN92[电子电信—通信与信息系统]