turbo編碼圖像傳輸?shù)姆抡媾c研究.doc
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turbo編碼圖像傳輸?shù)姆抡媾c研究,turbo編碼圖像傳輸?shù)姆抡媾c研究摘 要本文是對一種新型卷積碼——turbo碼的編譯碼算法進行研究及其將應用到圖像傳輸?shù)膍atlab仿真，著重討論的是turbo碼譯碼算法的改進及性能分析。turbo碼由于在比特誤碼率方面的性能可以接近香農(nóng)極限，成為當今的研究熱點。它的編碼器是將兩個遞歸系統(tǒng)卷積碼并行級聯(lián)，而其相應的譯碼...
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Turbo編碼圖像傳輸?shù)姆抡媾c研究
摘 要
本文是對一種新型卷積碼——Turbo碼的編譯碼算法進行研究及其將應用到圖像傳輸?shù)腗atlab仿真，著重討論的是Turbo碼譯碼算法的改進及性能分析。Turbo碼由于在比特誤碼率方面的性能可以接近香農(nóng)極限，成為當今的研究熱點。它的編碼器是將兩個遞歸系統(tǒng)卷積碼并行級聯(lián)，而其相應的譯碼器采用迭代譯碼方法。
第一章做了一下選題背景的介紹，第二章信道編碼方法的比較，主要是LDPC碼和TURBO碼的一個簡單介紹和性能上的比較，并說明本文采用TURBO碼的原因；第三、四兩章主要是圍繞了Turbo碼的編碼方法、編碼器的結構、譯碼原理、譯碼算法，也給出了詳細的理論推導過程。第六章對我們的仿真平臺Matlab做了一些介紹，并利用它對Turbo碼圖像傳輸?shù)木幋a、譯碼的整個過程做的仿真做了設計和實現(xiàn)。第七章列舉了Turbo碼的不足，然后對本畢業(yè)設計做了簡要總結及致謝。
關鍵詞 信道編碼 Turbo碼 編譯碼器 圖像傳輸
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 錄
摘 要 I
ABSTRACT II
1 緒論 1
1.1 選題背景 1
1.2 Turbo編碼在圖像傳輸?shù)难芯楷F(xiàn)狀 1
1.3 本文組織結構 1
2 信道編碼方法的比較 1
2.1 信道編碼簡介 1
2.1.1 信道編碼的提出和發(fā)展歷程 1
2.1.2 信道編碼的分類 4
2.2 LDPC碼的簡介 1
2.3 Turbo碼編譯碼方案的提出 1
2.4 Turbo碼的研究現(xiàn)狀 1
2.4.1編碼器的研究 1
2.4.2迭代譯碼算法 1
2.5 Turbo碼的優(yōu)點和缺點 1
3 Turbo碼編碼 10
3.1 編碼器各部分介紹 10
3.2 編碼原理及算法 11
4 Turbo碼譯碼 15
4.1 譯碼器結構 15
4.2 Turbo碼迭代譯碼基本原理 16
4.3 MAP(maximum a posteriori)算法 17
5 Turbo碼圖像傳輸?shù)脑O計 15
5.1 信源模塊 15
5.2 十進制轉二進制 16
5.3 Turbo編碼 16
5.4 噪聲 16
5.5 Turbo解碼 16
5.6 二進制十轉進制 16
5.7信宿 17
6 Matlab介紹及仿真結果討論 21
6.1 Matlab程序設計語言概述 21
6.2 程序仿真結果 23
7 結束語 28
致 謝 29
參考文獻 30
摘 要
本文是對一種新型卷積碼——Turbo碼的編譯碼算法進行研究及其將應用到圖像傳輸?shù)腗atlab仿真，著重討論的是Turbo碼譯碼算法的改進及性能分析。Turbo碼由于在比特誤碼率方面的性能可以接近香農(nóng)極限，成為當今的研究熱點。它的編碼器是將兩個遞歸系統(tǒng)卷積碼并行級聯(lián)，而其相應的譯碼器采用迭代譯碼方法。
第一章做了一下選題背景的介紹，第二章信道編碼方法的比較，主要是LDPC碼和TURBO碼的一個簡單介紹和性能上的比較，并說明本文采用TURBO碼的原因；第三、四兩章主要是圍繞了Turbo碼的編碼方法、編碼器的結構、譯碼原理、譯碼算法，也給出了詳細的理論推導過程。第六章對我們的仿真平臺Matlab做了一些介紹，并利用它對Turbo碼圖像傳輸?shù)木幋a、譯碼的整個過程做的仿真做了設計和實現(xiàn)。第七章列舉了Turbo碼的不足，然后對本畢業(yè)設計做了簡要總結及致謝。
關鍵詞 信道編碼 Turbo碼 編譯碼器 圖像傳輸
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 錄
摘 要 I
ABSTRACT II
1 緒論 1
1.1 選題背景 1
1.2 Turbo編碼在圖像傳輸?shù)难芯楷F(xiàn)狀 1
1.3 本文組織結構 1
2 信道編碼方法的比較 1
2.1 信道編碼簡介 1
2.1.1 信道編碼的提出和發(fā)展歷程 1
2.1.2 信道編碼的分類 4
2.2 LDPC碼的簡介 1
2.3 Turbo碼編譯碼方案的提出 1
2.4 Turbo碼的研究現(xiàn)狀 1
2.4.1編碼器的研究 1
2.4.2迭代譯碼算法 1
2.5 Turbo碼的優(yōu)點和缺點 1
3 Turbo碼編碼 10
3.1 編碼器各部分介紹 10
3.2 編碼原理及算法 11
4 Turbo碼譯碼 15
4.1 譯碼器結構 15
4.2 Turbo碼迭代譯碼基本原理 16
4.3 MAP(maximum a posteriori)算法 17
5 Turbo碼圖像傳輸?shù)脑O計 15
5.1 信源模塊 15
5.2 十進制轉二進制 16
5.3 Turbo編碼 16
5.4 噪聲 16
5.5 Turbo解碼 16
5.6 二進制十轉進制 16
5.7信宿 17
6 Matlab介紹及仿真結果討論 21
6.1 Matlab程序設計語言概述 21
6.2 程序仿真結果 23
7 結束語 28
致 謝 29
參考文獻 30
