摘要
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。
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.
出处
《电脑知识与技术（过刊）》
2015年第7X期45-47,共3页
Computer Knowledge and Technology
