【摘要】：在現(xiàn)代生活日新月異的進(jìn)步中，各種高科技領(lǐng)域都在飛速發(fā)展，圖像通信作為多媒體通信中的重點(diǎn)部分越來(lái)越多的獲得人們的重視。傳統(tǒng)的信源信道分離編碼設(shè)計(jì)的方案，在通常情況下會(huì)使圖像傳輸應(yīng)用的效率降低，在解碼端不能夠很好的恢復(fù)原始圖像。在實(shí)際的通信系統(tǒng)中，對(duì)于既定的信道特性，，為獲得更高的性能增益，信源信道聯(lián)合編碼被人們提出，并深入研究。 本文首先總結(jié)了信源信道聯(lián)合編碼的研究背景和意義，對(duì)信源信道聯(lián)合編碼的應(yīng)用前景和研究現(xiàn)狀做了詳細(xì)的分析。在此部分，分別闡述了信源編碼和信道編碼的基本概念、構(gòu)造原理及常見(jiàn)的編碼方法。還介紹了信源信道聯(lián)合編碼算法的基礎(chǔ)理論知識(shí)，其中包括信源信道聯(lián)合編碼算法的性能的優(yōu)異性和被提出的必然性，信源信道聯(lián)合編碼的分類(lèi)和適用范圍。 其次，研究了兩種信源編碼，基于多級(jí)樹(shù)集合分裂排序算法和無(wú)表零樹(shù)編碼算法，結(jié)合這兩種算法研究出一種不使用鏈表的零樹(shù)編碼算法。這種編碼的基礎(chǔ)是SPIHT算法，對(duì)SPIHT算法的零樹(shù)結(jié)構(gòu)進(jìn)行了改進(jìn)，是其能夠同時(shí)利用子帶間和子帶內(nèi)這兩種相關(guān)性；改進(jìn)了編碼時(shí)的掃描順序；引入了LZC編碼中的狀態(tài)位圖，從而得出本文改進(jìn)的信源編碼算法。 本文還介紹了低密度奇偶校驗(yàn)碼碼的Tanner表示法，以及幾種常見(jiàn)的構(gòu)造方法，提出并通過(guò)實(shí)驗(yàn)仿真實(shí)現(xiàn)了對(duì)LDPC碼進(jìn)行雙重不等差錯(cuò)保護(hù)的方法。 最后，驗(yàn)證本文構(gòu)造的聯(lián)合信源信道聯(lián)合編碼算法，基于改進(jìn)的SPIHT算法和雙重不等差錯(cuò)保護(hù)的LDPC碼的聯(lián)合編碼，并通過(guò)實(shí)驗(yàn)仿真證明了該方案的可行性，通過(guò)性能指標(biāo)的對(duì)比體現(xiàn)出該方案的優(yōu)異性。
[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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN911.2

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 孫金慶;周風(fēng)余;楊陽(yáng);唐相猛;劉兆琦;;基于多硬件編碼器協(xié)同的高效紅外視頻編碼[J];山東大學(xué)學(xué)報(bào)(工學(xué)版);2015年04期

本文編號(hào)：2497032