信道中QPSK信号传输性能的仿真分析

摘要

This paper describes the basic principle of the quadrature phase shift keying (QPSK), and builts the QPSK communica?tion system model of Gauss channel and multipath fading channel based on Matlab/Simulink simulation software. The signal perfor?mance in the two channel are simulated and analyzed. The results show that the reliability of the signal in the Gauss channel is bet?ter than that of the multipath fading channel as the same SNR. If Without compensation, the reliable transmission can not be trans?mitted in the multipath fading channel. So the research is the foundation of the application of QPSK modulation technology in mo?bile communication.%该文阐述了正交相移键控(QPSK)的基本原理,以Matlab/Simulink仿真软件为平台,建立了加性高斯信道和多径衰落信道下的QPSK通信系统模型.对该信号在上述两种信道中的传输性能进行了仿真分析.结果表明信噪比相同时,信号在高斯白噪声信道中的可靠性优于多径衰落信道.如果不对多径衰落信道中的衰落进行补偿,则无法进行可靠传输.因此文中所做研究为QPSK调制技术在移动通信中应用打下基础.