MATLAB维特比译码算法在不同信道中的性能仿真
关键词：MATLAB； 仿真； 信道编码；信道编码器； 文特比译码； 二进制对称信道；加性高斯白噪声信道
Viterbi decoding algorithm performance simulation based on different channels
Abstract: This topic describes one kind of digital communication systems convolutional codes Viterbi decoding software algorithm, implemented in Matlab environment convolutional codes Viterbi decoding functions, procedures to achieve full use of the characteristics of convolutional codes , the use of grid map and backtracking to obtain decoded output. In order to better use in practice excellent performance of the convolutional code, the article from the application point of view, the method of decoding convolutional codes is analyzed, in different circumstances, how to use a variety of decoding method, theoretical performance and practical application to obtain the best combination. Completed in two different channel binary symmetric channel, additive white Gaussian noise channel performance simulation program. Using MATLAB to complete the design of the convolutional code, a convolutional code encoder identify and determine the generating polynomial, viterbi decoding using convolutional codes. Through the convolutional code transmitted in additive noise channel can be used to verify the performance of reliable information transmission.
Keywords: MATLAB; Simulation; channel coding; channel encoder; Viterbi; Binary symmetric channel; AWGN channel
目录
引言 1
1 本课题的任务内容 2
1.1 课题背景及意义 2
1.2 卷积码的发展及应用 3
2 信道编码 5
2.1 纠错码基本理论 5
2.1.2 纠错码概念 5
2.1.3 基本原理和性能参数 5
2.1.4 译码方式的实现 5
2.2 信道编码定理 6
2.3 信道编解码基本原理 6
2.4 卷积码 8
2.4.1 卷积码的基本原理 8
2.4.2 卷积码表达方式 9
3 MATLAB 11
3.1 MATLAB简介 11
3.2 SIMULINK原理 13
3.3 文特比译码器模块介绍 16
4 信道 19
4.1 二进制对称信道 19
4.2 加性高斯白噪声信道 19
5 文特比译码的设计与仿真 21
5.1 文特比译码在二进制对称信道中的性能仿真 21
5.1.1 文特比译码在BSC中的仿真设计模块 21
5.1.2 文特比译码在BSC中的仿真程序 22
5.1.3 文特比译码在BSC中的各模块参数设置 23
5.1.4 文特比译码在BSC中的仿真结果 26
5.2 文特比译码在加性高斯白噪声信道中的性能仿真 27
5.2.1 文特比译码在AWGN中的仿真设计模块 27