摘要：信道是通信系统的基本环节之一。在通信系统中，发送端产生的数据通过信源编码和信号调制转化成已调信号，然后进入信道。这些调制信号通过信道到达接收端，在接收端通过与发送端相反的过程得到原始数据。信道的传输质量影响着信号的接收和解调。这种影响表现在两个方面。一是产生噪声，二是减弱信号的强度和改变信号的形状。通信系统的设计目标是使接收端能够毫无差别的再现发送端发送的原始数据。因此，在设计通信系统的过程中，信道对传输信号的影响是一个不可或缺的环节。39296
调制包含调节或调整的意义。调制的主要目的是使经过编码的信号特性与信道的特性相适应，使信号经过调制后能够顺利通过信道传输。本次毕业设计依托MATLAB仿真软件，旨在研究数字调制在信道中的性能仿真研究。
毕业论文关键词：信道；噪声；调制；MATLAB
The simulation research of digital modulation which is based on MATLAB in the channel performance
Abstract：Channel is one of the basic link of communication system. In a communication system, the sender produces data through information source coding and modulation signal into a modulated signal, and then into the channel. The modulation signal through the channel to the receiver, in the receiving end and sending end through the reverse process to get the raw data. The channel transmission quality affects the signal receiving and demodulation. This kind of influence displays in two aspects. One is noise, the other is less signal intensity and change the shape of a signal. Communication system design goal is to make the receiver can reproduce the sender sends no difference between the raw data. Therefore, in the process of design communication system, channel's influence on the transmission signal is an indispensable link.
Modulation contain or adjust the significance of the adjustment. Main purpose is to make the encoded signal modulation characteristics corresponding to the characteristics of the channel, make after modulation signal can be transmitted smoothly through the channel. The graduation design based on MATLAB simulation software, designed to study the performance simulation of digital modulation in the channel.
Keywords: Channel; Noise; Modulation; MATLAB
目录
摘要：    1
Abstract：    1
目录    2
1    绪论    4
1.1  MATALB简介    5
1.1.1    MATLAB集成开发环境    5
1.2    通信仿真    9
1.2.1    通信仿真的一般步骤    9
2    分析    10
2.1   Simulink    10
2.1.1   Simulink简介    10
2.2    Simulink工作环境    10
2.2.1    Simulink模型库    10
2.2.2    设计仿真模型    11
2.2.3    运行仿真    12
2.2.4    建立子系统    13
2.3    Simulink模型库    14
3  设计    16
3.1    信源    16
3.2   信宿    16
3.3    信道    16
3.4  加性高斯白噪声信道    17
3.4.1  加性高斯白噪声信道模块    17
3.4.2  BFSK在高斯白噪声信道中的传输性能    19
3.5    多径瑞利衰落信道    26
3.5.1    多径瑞利衰落信道模块    26
3.5.2    BFSK在多径瑞利衰落信道中的传输性能    28 基于MATLAB的数字调制在信道中的性能仿真研究+程序:http://www.751com.cn/tongxin/lunwen_39585.html