信源信道联合编码算法的研究
发布时间：2019-06-11 05:08
【摘要】：在现代生活日新月异的进步中，各种高科技领域都在飞速发展，图像通信作为多媒体通信中的重点部分越来越多的获得人们的重视。传统的信源信道分离编码设计的方案，在通常情况下会使图像传输应用的效率降低，在解码端不能够很好的恢复原始图像。在实际的通信系统中，对于既定的信道特性，，为获得更高的性能增益，信源信道联合编码被人们提出，并深入研究。 本文首先总结了信源信道联合编码的研究背景和意义，对信源信道联合编码的应用前景和研究现状做了详细的分析。在此部分，分别阐述了信源编码和信道编码的基本概念、构造原理及常见的编码方法。还介绍了信源信道联合编码算法的基础理论知识，其中包括信源信道联合编码算法的性能的优异性和被提出的必然性，信源信道联合编码的分类和适用范围。 其次，研究了两种信源编码，基于多级树集合分裂排序算法和无表零树编码算法，结合这两种算法研究出一种不使用链表的零树编码算法。这种编码的基础是SPIHT算法，对SPIHT算法的零树结构进行了改进，是其能够同时利用子带间和子带内这两种相关性；改进了编码时的扫描顺序；引入了LZC编码中的状态位图，从而得出本文改进的信源编码算法。 本文还介绍了低密度奇偶校验码码的Tanner表示法，以及几种常见的构造方法，提出并通过实验仿真实现了对LDPC码进行双重不等差错保护的方法。 最后，验证本文构造的联合信源信道联合编码算法，基于改进的SPIHT算法和双重不等差错保护的LDPC码的联合编码，并通过实验仿真证明了该方案的可行性，通过性能指标的对比体现出该方案的优异性。
[Abstract]:With the rapid progress of modern life, all kinds of high-tech fields are developing rapidly. As the key part of multimedia communication, image communication has been paid more and more attention. The traditional source channel separation coding scheme can reduce the efficiency of image transmission application and can not restore the original image well at the decoding end. In the actual communication system, for the established channel characteristics, in order to obtain higher performance gain, joint source-channel coding is proposed and deeply studied. In this paper, the research background and significance of joint source-channel coding are summarized, and the application prospect and research status of joint source-channel coding are analyzed in detail. In this part, the basic concepts, construction principle and common coding methods of source coding and channel coding are described respectively. The basic theory of joint source-channel coding algorithm is also introduced, including the performance of joint source-channel coding algorithm and the proposed necessity, the classification and application range of joint source-channel coding algorithm. Secondly, two kinds of source coding are studied. Based on the multi-level tree set split sorting algorithm and the table-free zero-tree coding algorithm, a zero-tree coding algorithm without linked list is proposed. The basis of this coding is SPIHT algorithm, which improves the zero-tree structure of SPIHT algorithm, which can make use of the two kinds of correlation between subbands and subbands at the same time, and improves the scanning sequence of coding. The state bitmap in LZC coding is introduced, and the improved source coding algorithm in this paper is obtained. This paper also introduces the Tanner representation of low density parity check codes and several common construction methods. The method of double unequal error protection for LDPC codes is proposed and realized by experimental simulation. Finally, the joint source channel joint coding algorithm constructed in this paper is verified, which is based on the improved SPIHT algorithm and the joint coding of dual unequal error protected LDPC codes, and the feasibility of the scheme is proved by experimental simulation. Through the comparison of performance indexes, the advantages and differences of the scheme are reflected.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.2
本文编号：2497032
[Abstract]:With the rapid progress of modern life, all kinds of high-tech fields are developing rapidly. As the key part of multimedia communication, image communication has been paid more and more attention. The traditional source channel separation coding scheme can reduce the efficiency of image transmission application and can not restore the original image well at the decoding end. In the actual communication system, for the established channel characteristics, in order to obtain higher performance gain, joint source-channel coding is proposed and deeply studied. In this paper, the research background and significance of joint source-channel coding are summarized, and the application prospect and research status of joint source-channel coding are analyzed in detail. In this part, the basic concepts, construction principle and common coding methods of source coding and channel coding are described respectively. The basic theory of joint source-channel coding algorithm is also introduced, including the performance of joint source-channel coding algorithm and the proposed necessity, the classification and application range of joint source-channel coding algorithm. Secondly, two kinds of source coding are studied. Based on the multi-level tree set split sorting algorithm and the table-free zero-tree coding algorithm, a zero-tree coding algorithm without linked list is proposed. The basis of this coding is SPIHT algorithm, which improves the zero-tree structure of SPIHT algorithm, which can make use of the two kinds of correlation between subbands and subbands at the same time, and improves the scanning sequence of coding. The state bitmap in LZC coding is introduced, and the improved source coding algorithm in this paper is obtained. This paper also introduces the Tanner representation of low density parity check codes and several common construction methods. The method of double unequal error protection for LDPC codes is proposed and realized by experimental simulation. Finally, the joint source channel joint coding algorithm constructed in this paper is verified, which is based on the improved SPIHT algorithm and the joint coding of dual unequal error protected LDPC codes, and the feasibility of the scheme is proved by experimental simulation. Through the comparison of performance indexes, the advantages and differences of the scheme are reflected.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.2
【引证文献】
相关期刊论文 前1条
1 孙金庆;周风余;杨阳;唐相猛;刘兆琦;;基于多硬件编码器协同的高效红外视频编码[J];山东大学学报(工学版);2015年04期
本文编号：2497032
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