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turbo编码图像传输的仿真与研究,turbo编码图像传输的仿真与研究摘 要本文是对一种新型卷积码——turbo码的编译码算法进行研究及其将应用到图像传输的matlab仿真，着重讨论的是turbo码译码算法的改进及性能分析。turbo码由于在比特误码率方面的性能可以接近香农极限，成为当今的研究热点。它的编码器是将两个递归系统卷积码并行级联，而其相应的译码...
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Turbo编码图像传输的仿真与研究
摘 要
本文是对一种新型卷积码——Turbo码的编译码算法进行研究及其将应用到图像传输的Matlab仿真，着重讨论的是Turbo码译码算法的改进及性能分析。Turbo码由于在比特误码率方面的性能可以接近香农极限，成为当今的研究热点。它的编码器是将两个递归系统卷积码并行级联，而其相应的译码器采用迭代译码方法。
第一章做了一下选题背景的介绍，第二章信道编码方法的比较，主要是LDPC码和TURBO码的一个简单介绍和性能上的比较，并说明本文采用TURBO码的原因；第三、四两章主要是围绕了Turbo码的编码方法、编码器的结构、译码原理、译码算法，也给出了详细的理论推导过程。第六章对我们的仿真平台Matlab做了一些介绍，并利用它对Turbo码图像传输的编码、译码的整个过程做的仿真做了设计和实现。第七章列举了Turbo码的不足，然后对本毕业设计做了简要总结及致谢。
关键词 信道编码 Turbo码 编译码器 图像传输
MATLAB SIMULATION OF TURBO-CODE ENCODING AND DECODING
ABSTRACT
This article is about a kind of new convolution code - encoding decoding algorithm of Turbo codes is studied and its application to image transmission of the Matlab simulation, emphatically discussed is the Turbo code decoding algorithm improvement and performance analysis. Turbo codes as performance in terms of bit error rate can be close to the shannon limit, become the research hotspots today. It will two encoders are recursive convolution code parallel cascade system, and its corresponding decoder using iterative decoding method.
First chapter is to introduce the selected topic background, the second chapter the comparison of channel coding method, mainly is the LDPC code and TURBO code of a simple introduction and comparison of performance, and explain the reason for this paper adopt TURBO codes; The third and fourth chapter two is mainly about the Turbo code encoding method, the structure of the encoder and decoder principle and the decoding algorithm, and also gives the detailed theoretical derivation. In chapter 6 we have done some of the simulation platform of Matlab is introduced, and use it for encoding and decoding of Turbo codes image transmission of the whole process of doing the simulation for the design and implementation. Chapter 7 lists the Turbo code, this graduation design and then made a brief summary and thanks.
KEY WORDS channel-coding, Turbo-code, code - encoding decoding Image transmission
目 录
摘 要 I
ABSTRACT II
1 绪论 1
1.1 选题背景 1
1.2 Turbo编码在图像传输的研究现状 1
1.3 本文组织结构 1
2 信道编码方法的比较 1
2.1 信道编码简介 1
2.1.1 信道编码的提出和发展历程 1
2.1.2 信道编码的分类 4
2.2 LDPC码的简介 1
2.3 Turbo码编译码方案的提出 1
2.4 Turbo码的研究现状 1
2.4.1编码器的研究 1
2.4.2迭代译码算法 1
2.5 Turbo码的优点和缺点 1
3 Turbo码编码 10
3.1 编码器各部分介绍 10
3.2 编码原理及算法 11
4 Turbo码译码 15
4.1 译码器结构 15
4.2 Turbo码迭代译码基本原理 16
4.3 MAP(maximum a posteriori)算法 17
5 Turbo码图像传输的设计 15
5.1 信源模块 15
5.2 十进制转二进制 16
5.3 Turbo编码 16
5.4 噪声 16
5.5 Turbo解码 16
5.6 二进制十转进制 16
5.7信宿 17
6 Matlab介绍及仿真结果讨论 21
6.1 Matlab程序设计语言概述 21
6.2 程序仿真结果 23
7 结束语 28
致 谢 29
参考文献 30
摘 要
本文是对一种新型卷积码——Turbo码的编译码算法进行研究及其将应用到图像传输的Matlab仿真，着重讨论的是Turbo码译码算法的改进及性能分析。Turbo码由于在比特误码率方面的性能可以接近香农极限，成为当今的研究热点。它的编码器是将两个递归系统卷积码并行级联，而其相应的译码器采用迭代译码方法。
第一章做了一下选题背景的介绍，第二章信道编码方法的比较，主要是LDPC码和TURBO码的一个简单介绍和性能上的比较，并说明本文采用TURBO码的原因；第三、四两章主要是围绕了Turbo码的编码方法、编码器的结构、译码原理、译码算法，也给出了详细的理论推导过程。第六章对我们的仿真平台Matlab做了一些介绍，并利用它对Turbo码图像传输的编码、译码的整个过程做的仿真做了设计和实现。第七章列举了Turbo码的不足，然后对本毕业设计做了简要总结及致谢。
关键词 信道编码 Turbo码 编译码器 图像传输
MATLAB SIMULATION OF TURBO-CODE ENCODING AND DECODING
ABSTRACT
This article is about a kind of new convolution code - encoding decoding algorithm of Turbo codes is studied and its application to image transmission of the Matlab simulation, emphatically discussed is the Turbo code decoding algorithm improvement and performance analysis. Turbo codes as performance in terms of bit error rate can be close to the shannon limit, become the research hotspots today. It will two encoders are recursive convolution code parallel cascade system, and its corresponding decoder using iterative decoding method.
First chapter is to introduce the selected topic background, the second chapter the comparison of channel coding method, mainly is the LDPC code and TURBO code of a simple introduction and comparison of performance, and explain the reason for this paper adopt TURBO codes; The third and fourth chapter two is mainly about the Turbo code encoding method, the structure of the encoder and decoder principle and the decoding algorithm, and also gives the detailed theoretical derivation. In chapter 6 we have done some of the simulation platform of Matlab is introduced, and use it for encoding and decoding of Turbo codes image transmission of the whole process of doing the simulation for the design and implementation. Chapter 7 lists the Turbo code, this graduation design and then made a brief summary and thanks.
KEY WORDS channel-coding, Turbo-code, code - encoding decoding Image transmission
目 录
摘 要 I
ABSTRACT II
1 绪论 1
1.1 选题背景 1
1.2 Turbo编码在图像传输的研究现状 1
1.3 本文组织结构 1
2 信道编码方法的比较 1
2.1 信道编码简介 1
2.1.1 信道编码的提出和发展历程 1
2.1.2 信道编码的分类 4
2.2 LDPC码的简介 1
2.3 Turbo码编译码方案的提出 1
2.4 Turbo码的研究现状 1
2.4.1编码器的研究 1
2.4.2迭代译码算法 1
2.5 Turbo码的优点和缺点 1
3 Turbo码编码 10
3.1 编码器各部分介绍 10
3.2 编码原理及算法 11
4 Turbo码译码 15
4.1 译码器结构 15
4.2 Turbo码迭代译码基本原理 16
4.3 MAP(maximum a posteriori)算法 17
5 Turbo码图像传输的设计 15
5.1 信源模块 15
5.2 十进制转二进制 16
5.3 Turbo编码 16
5.4 噪声 16
5.5 Turbo解码 16
5.6 二进制十转进制 16
5.7信宿 17
6 Matlab介绍及仿真结果讨论 21
6.1 Matlab程序设计语言概述 21
6.2 程序仿真结果 23
7 结束语 28
致 谢 29
参考文献 30
