交互式QPSK传输仿真系统的设计与实现

为了增强学生对通信原理的感性认识,以常用的四进制相位键控（QPSK）数字通信系统为例,设计了基于Matlab图形界面的交互式QPSK传输仿真系统.内容涵盖调制、信道、解调,各部分结构、功能按模块讲解,各功能通过仿真波形展示,亦可选择信号实测结果进行观测,增强系统的真实性.同时系统参数可以交互配置,通过图形直观地显示不同参数对系统的影响.分析成形滤波对调制波形的影响,并给出了相应的功率谱密度;研究了载波估计中频率偏差、相位偏差对解调结果的影响,并通过星座图的变化进行演示,同时给出频偏、相偏仿真的等效基带表示....

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Bibliographic Details
Published in实验室研究与探索 Vol. 33; no. 7; pp. 29 - 34
Main Author 杨德伟 龙哲仁 王华
Format Journal Article
LanguageChinese
Published 北京理工大学信息与电子学院,北京,100081 2014
Subjects
Matlab
仿真系统
四进制相移键控
相位偏移
频率偏移
frequency offset
phase offset
四进制相移键控
仿真系统
频率偏移
相位偏移
QPSK(Quaternary Phase Shift Keying)
simulation system
Matlab
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ISSN1006-7167

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Summary:为了增强学生对通信原理的感性认识,以常用的四进制相位键控（QPSK）数字通信系统为例,设计了基于Matlab图形界面的交互式QPSK传输仿真系统.内容涵盖调制、信道、解调,各部分结构、功能按模块讲解,各功能通过仿真波形展示,亦可选择信号实测结果进行观测,增强系统的真实性.同时系统参数可以交互配置,通过图形直观地显示不同参数对系统的影响.分析成形滤波对调制波形的影响,并给出了相应的功率谱密度;研究了载波估计中频率偏差、相位偏差对解调结果的影响,并通过星座图的变化进行演示,同时给出频偏、相偏仿真的等效基带表示.
Bibliography:YANG De-wei,LONG Zhe-ren,WANG Hu（ School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China）
QPSK（Quaternary Phase Shift Keying） ; frequency offset; phase offset; Matlab; simulation system
In order to increase students＇ comprehension to principles of communications,the common Quaternary Phase Shift Keying （QPSK） digital communication system is taken into consideration and an interactive QPSK transmission demonstration system based on the graphical user interface of Matlab is designed.Modulation,channel and demodulation parts are all included,and each one＇ s structures and functions are listed as modules,while the functions are illustrated using simulation waves.The measure results attained by testing real signal are displayed,so as to add the reality of platform.At the same time,the system can be configured interactively,and the influence of different parameters is shown by images intuitively.The effects of shaping filter are analyzed,and the power spectrum density figure is
ISSN:1006-7167