LDPC codes and applied research ABSTRACT
Error-controlling codes, also called channel coding has been widely applied in various communication system and computer system. And it is the mobile communication system, one of the key technology . LDPC code is comparatively outstanding good yards. Most closely because LDPC code is the channel coding Shannon limit, but also the next generation broadband mobile communication system error correction coding main alternatives.
The graduation design mainly through a vast amount of literature review and study, familiar with the definition and principles LDPC code; Two kind of coding method based on triangle matrix under the coding method based on approximate triangular matrices and the coding method, decoding algorithm and it and another kind of Turbo yards of comparison, compare their performance differences and decode complexity. LDPC code in a variety of areas are widely used, For instance (the second generation 论文网http://www.youerw.com/ DVB - S2 satellite digital video broadcast system), CMMB (China mobile multimedia broadcasting), compressed image transmission and digital image watermarking, etc. Through LDPC code in the application of digital image watermarking system based on LDPC code to research the watermarking scheme, This scheme is mainly used to raise the image watermarking robustness, Through the watermark on its principle of coding of more comprehensive study to more in-depth understanding of the digital image LDPC code watermarking system application.原文请加优.文^论,文'网QQ324.9114
Key words: Error-controlling codes LDPC codes Turbo code image watermarking
目 录
摘要 Ⅰ
ABSTRACT Ⅱ
1 前言 1
1.1研究背景 1
1.2研究内容 1
1.3研究的任务及目标 2
2 差错控制编码理论 3
2.1差错控制编码基本概念 3
2.2信道模型和信道容量 6
2.3信涤培码定理 7
3 LDPC码 9
3.1LDPC码的概念 9
3.1.1LDPC码的定义 9
3.1.2LDPC码的Tanner图表示 10
3.1.3非规则LDPC码 10
3.2 LDPC码的几何构造 11
3.3 LDPC码的编码方法 12
3.3.1基于下三角矩阵的编码方法
3.3.2基于近似三角矩阵的编码方法
3.4 LDPC码的译码 14
4 LDPC码与Turbo码的比较 17
4.1Turbo码概述 17
4.2LDPC码与Turbo码的比较 19
5 LDPC码的应用 22
5.1LDPC码应用领域 22
5.2LDPC码在图像数字水印系统中的应用 23
5.2.1图像数字水印技术 23
5.2.2基于LDPC码的水印方案 25
6 结束语 32
参考文献 33
谢辞 34,2257
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