基于LabVIEW的QPSK通信系统的仿真设计  

Simulation design of communication system for QPSK based on LabVIEW

作　　者：程铃[1] 鄂雨莹 CHENG Ling;E Yu-ying(College of Electronic&Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《信息技术》2022年第7期12-18,共7页Information Technology

基　　金：教育部产学合作协同育人项目(201902289029);江苏省高等教育教改立项研究课题(2019JSJG261)。

摘　　要：针对难以理解各参数对QPSK系统性能影响的问题,利用LabVIEW图形化软件设计了QPSK通信系统仿真平台,前面板使用图形化的输入输出控件,便于直观分析和观察各种性能指标图形,程序框图采用各种子vi实现,按数据流的方向连接。仿真结果表明:采用升余弦型脉冲成形滤波器后,星座图信号点偏离理想矢量点,说明误比特率高于未使用滤波器的情况;滚降系数α越大,星座图越清晰,信号点越集中在四个坐标点附近,表明系统的可靠性提高,仿真结果与理论一致。该系统界面简洁美观,具有良好的交互性和实用性,适用于高校QPSK的课堂演示和实验教学。Based on the problem that it is difficult to understand the influence of various parameters on the performance of QPSK system,the simulation platform of QPSK communication system is designed by using LabVIEW graphical software.Graphical input and output controls are used in the front panel,which is convenient for intuitive analysis and observation of various performance index graphics.The program block diagram is realized by various sub VI,and connected according to the direction of data flow.The simulation results show that signal points deviate from the ideal vector points in the constellation after using the ascending cosine pulse-forming filter,indicating that the bit error rate is higher than that of the unused filter.The larger the roll off coefficientαis,the clearer the constellation is,and the signal points are more concentrated near the four coordinate points,which indicates that the reliability of the system is improved,and the simulation results are consistent with the theory.The system interface is simple and beautiful,with good interactivity and practicality,and is suitable for classroom demonstration and experimental teaching of QPSK in universities.

关 键 词：QPSK LABVIEW 仿真 星座图 误比特率 

分 类 号：TN911[电子电信—通信与信息系统]