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matlab模拟设计一个通信系统


关键词:增量调制、AMI 码、循环码、ASK、衰落信道
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通信系统课群综合训练课程设计说明书
Abstract
In digital communication system, need the input digital sequence map for signal transmission in the channel, the source output digital sequence, after signal after mapping become suitable for channel transmission of digital modulation signals, and at the receiving end corresponding to resume the original signal demodulation. So this thesis mainly studies the digital signal transmission of the basic concept and the digital signal transmission transmission process and how to use MATLAB simulation software to design digital transmission system. The first interface introduced this topic theoretical basis, including digital communication, digital baseband transmission system composition and digital signal transmission process. According to the simulation process and basic steps of the MATLAB simulation tools to implement the digital baseband transmission system's process, the system is analyzed.
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通信系统课群综合训练课程设计说明书
摘要
在数字通信系统中,需要将输入的数字序列映射为信号波形在信道中传输, 此时信源输出数字序列, 经过信号映射后成为适于信道传输的数字调制信号,并 在接收端对应进行解调恢复出原始信号。 所以本论文主要研究了数字信号的传输 的基本概念及数字信号传输的传输过程和如何用 MATLAB 软件仿真设计数字传输 系统。首先介介绍了本课题的理论依据,包括数字通信,数字基带传输系统的组 成及数字信号的传输过程。然后按照仿真过程基本步骤用 MATLAB 的仿真工具实 现了数字基带传输系统的真过程,对系统进行了分析。
1.2 主要步骤
本通信传输系统的 MATLAB 仿真包括以下内容:单频正弦波模拟信号经过抽 样(抽样频率为 Fs=20F) 、增量调制、二进制自然编码、AMI 码型变换基带传输, 循环编码 ASK 调制后发送到衰落信道,然后经过 ASK 解调,循环码译码、AMI 码 译码、数模转换后恢复出单频正弦波模拟信号。 信源:采用单频率正弦波; 数字化方式:增量调制(DM) ; 基带码:AMI 码; 信道码:循环码; 调制方式:ASK; 信道类型:衰落信道。
通信系统课群综合训练课程设计说明书
目录
摘要.............................................................................................................................................1 Abstract...................................................................................................................................... 2 1 设计任务..................................................................................................................................3 1.1 系统简述......................................................................................................................3 1.2 主要步骤......................................................................................................................3 1.3 系统框图.....................................................................................................................3 2 系统原理及实现......................................................................................................................5 2.1 增量调制......................................................................................................................5 2.2 基带传输 AMI 码.........................................................................................................6 2.3 信道传输码循环码......................................................................................................7 2.4 ASK 调制......................................................................................................................9 2.5 衰落信道....................................................................................................................10 3 系统仿真................................................................................................................................11 3.1 增量调制仿真............................................................................................................11 3.2 基带传输 AMI 码.......................................................................................................12 3.3 信道传输码循环码....................................................................................................12 3.4 ASK 调制....................................................................................................................14 3.5 衰落信道....................................................................................................................14 3.6 解码过程....................................................................................................................15 3.7 数模转化及失真分析................................................................................................16 4 小结与体会............................................................................................................................18 5 参考文献................................................................................................................................19 6 附录程序................................................................................................................................20
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