基于MATLAB的频分复用系统的仿真 毕业论文.doc

本科毕业论文（设计） 题 目 基于MATLAB的频分复用系统的仿真 院（系） 电子工程与电气自动化学院 专 业 电子科学与技术 学生姓名 学 号 指导教师 职称 讲师 完成日期: 2013 年 5 月30日 巢湖学院本科毕业论文论文?simulation?of?frequency division?multiplexing?system based on Matlab Abstract With the development of communication technology.Frequency - Division Multiplexing technology in a wide range of applications and mobile communications.Frequency - division multiplexing is to the total bandwidth of the transmission channel .Transmission channel is divided into a number of child channels, each of the transmission signal all the way.Each channel occupies a different frequency, and less than the total bandwidth of a channel frequency. Each Channel separates each other at the same time, mutual interference to improve bandwidth utilization.It less than ideal and channel noise interference filter characteristics. MATLAB technology to nonlinear dynamic system modeling and simulation. It’s Provides solutions for scientific research and the design of numerical calculation. The design of frequency division multiplexing system using MATLAB Technology Design and Simulation. Through the acquisition of signals, by using band - pass filter and low - pass filter spectrum, It deepen the understanding of FDMA communication technology and mastering. Key words : MATLAB technology ，frequency division multiplexing technology ，channel ，frequency band , simulation 目 录 摘 要 I Abstract II 1. 引言 1 2.FDMA的设计原理及过程 1 2.1频分复用的原理 1 2.2模型的建立 2 2.3信号的采样 4 2,4调制语音信号 5 2.5系统的滤波器设计 6 2.6信道的噪声分析 7 3.MATLAB的仿真 8 3.1语音信号的仿真 8 3.2仿真复用信号的频谱 9 3.3仿真传输信号 10 3.4仿真解调信号 10 3.5仿真信号恢复后的时域和频域 11 总结 13 致谢 14 参考文献 15 附录 16 1. 引言 依据频分复用的复用的原理运用MATLAB软件采集两路以上的语音信号通过合适的高频载波调制，然后设计必要的带通滤波器和低通滤波器把得到的复用信号恢复成所采样的语音信号。在整个设计过程中运用MATLAB进行仿真，对采样的语音信号进行频域和时域的分析。通过本次设计可以加深我们对FDMA系统的认识和掌握学会对信道噪声的干扰进行分析和消除，同时学会MATLAB软件的基本使用及对软件的设计和仿真掌握低通和带通滤波器的设计 2.FDMA的设计原理及