基于MATLAB的2ASK频带传输系统仿真与性能分析

本科生毕业论文（设计）

题目：

基于MATLAB/Simulink的ASK频带传输系统仿真与性能

分析

学 院 机电工程学院 专业班级 电子信息工程07级2班

学生姓名 指导教师

撰写日期：2011年 4 月 19 日

摘 要

本毕业设计主要运用MATLAB集成环境下的Simulink仿真平台进行ASK频带传输系统仿真，并把运行仿真结果输入到显示器，根据显示器结果分析设计的系统性能。在毕业设计中，目的主要是仿真通信系统中频带传输技术中的ASK调制。产生一段随机的二进制非归零码的基带信号，对其进行ASK调制后再送入加性高斯白噪声（AWGN）信道传输，在接收端对其进行ASK解调以恢复原信号，观察还原是否成功，改变AWGN信道的信噪比，计算传输前后的误码率，绘制信噪比-误码率曲线，并与理论曲线比较进行说明。

关键词 Simulink，ASK调制，高斯白噪声，信噪比-误码率

Based on MATLAB/Simulink add band of transmission system

simulation and performance analysis

Abstract

The graduation design, the main use MATLAB integration environment like the simulink7.1 simulation platform of transmission system simulation, and bandwidth input to the operation simulation results, according to display monitor analysis and design of the system performance. At the graduation design, goal mainly is simulation communication system the ASK modulation bandwidth transmission technology. Produce a random binary non zero yards, and carry on the baseband signal sent again after add modulation additive white gaussian noise (AWGN) channel transmission, in the receiver to add to restore the original signal demodulation, observe whether success, change reduction AWGN channel SNR, calculation, rendering the transmission error before signal-to-noise ratio - ber curve, and compared with theoretical curves show.

Key Words: Simulink; ASK modulation; AWGN; SNR--bit error rate

目 录

1 引言 ................................................................................................. 错误！未定义书签。 1.1 设计目的 .................................................................................... 错误！未定义书签。 1.2 设计平台 .................................................................................... 错误！未定义书签。 2 基本原理 ........................................................................................................................... 2 2.1 Simulink工作环境 ........................................................................................................ 2 2.2二进制振幅键控(2ASK)原理 ....................................................................................... 4 3 系统设计 ........................................................................................................................... 5 3.1 ASK调制与解调 ........................................................................................................... 5 3.2加入高斯白噪声后的ASK调制与解调 ................................................................... 11 3.3 误码率的计算 ............................................................................................................ 15 4 出现的问题及解决的方法 ............................................................................................. 19 5 结语 ................................................................................................................................. 20 参考文献 ............................................................................................................................. 22 致 谢 ................................................................................................................................... 23 附录1：误码率计算（理论曲线） .................................................................................. 24 附录2：误码率计算（实际曲线） .................................................................................. 25