基于MATLAB的16QAM通信系统仿真毕业设计说明书2014-5-20.docVIP

2014届毕业设计说明书 基于MATLAB的16QAM通信系统仿真 院、 部： 电气与信息工程学院 学生姓名： 李 和 指导教师： 贾雅琼 职称 副教授 专 业： 通信工程 班 级： 通信1001班 完成时间： 2014-5-20 摘 要 随着现在的通信技术的飞速发展，特别是移动通信技术，因频谱资源的限制， 传统的通信系统容量开始不能满足目前用户需求，因此通信技术专家越来越关注频带利用率的问题。如何提高频谱利用率以及高功率谱密度是我们追求的目标。而正交振幅调制(Quadrature Amplitude Modulation，QAM16QAM）的调制解调原理，再利用MATLAB平台构建完整的16QAM通信系统，实现16QAM的调制解调系统的仿真，以及分析该系统性能。以此证明16QAM调制技术相对其他调制方式的优点。 关键词：调制解调；正交振幅调制；MATLAB仿真 ABSTRACT With the rapid development of modern communication technology, especially mobile communications technology, the capacity of traditional communication systems can not meet the requirements of the current user. And because of the limited spectrum resource, the problem of bandwidth efficiency is growing concerned of experts in the field of communications. So finding the way that how to improve the spectrum efficiency and high power spectral density is our goal. Quadrature amplitude modulation (QAM) with its high spectral efficiency and high power spectral density and other advantages, becomes important to those communication application that include the large-capacity digital microwave technology solutions, broadband wireless access and wireless video communications, and so on. This article describes the principle of modulation and demodulation of 16QAM, then builds a complete communication system of 16QAM based on MATLAB, which is to realize the simulation of 16QAM modem system and to analyse the performance of the system.It can prove that 16QAM modulation technology is more superior than the other. Key words:modem system; qam;matlab 目 录 1 绪论 1 1.1 课题研究的意义 1 1.2 国内外研究状况 1 1.3 研究内容与章节安排 2 2 课题理论基础 3 2.1 调制解调的定义 3 2.2 正交振幅调制 4 2.2.1 QAM简介 4 2.2.2 16QAM调制解调原理 6 3 基于MATLAB的16QAM通信系统仿真 9 3.1 MATLAB简介 9 3.1.1 MATLAB介绍 9 3.1.2 MATLAB语言特点 9 3.2 16QAM调制解调仿真程序流程框图 10 3.3 调制仿真模块 11 3.3.1 信号源 11 3.3.2 串/并变换 11 3.3.3 2-4电平转换 11 3.3.4 成形滤波器 12 3.3.5 调制 14 3.3.6 画星座图 15