Coding-decoding method for integrated source and channel variable-length symbol Turbo

A channel coding and long symbol technology, which is applied in coding, coding components, and error correction/detection by combining multiple code structures, can solve the problems of limited performance and inapplicability of separate coding systems, and improve the bit error rate. Performance, efficiency-enhancing effects

Inactive Publication Date: 2006-06-28
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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Problems solved by technology

[0005] In order to solve the two problems of the limited performance of the separate coding system and the unsuitability of classical Turbo coding for variable-length coded transmission systems such as video compression, the present invention provides a joint source channel variable-length symbol Turbo coding and decoding method

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  • Coding-decoding method for integrated source and channel variable-length symbol Turbo
  • Coding-decoding method for integrated source and channel variable-length symbol Turbo
  • Coding-decoding method for integrated source and channel variable-length symbol Turbo

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Embodiment Construction

[0019] 1. Joint Source Channel Variable Length Symbol Turbo Coding and Decoding Structure

[0020] In Fig. 4, information source information 1 is first input into information source encoder 2 for compression encoding, and information source encoder 2 outputs VLC variable-length code word sequence. In video compression international coding standards (such as MPEG or H.26x series), VLC coding usually uses efficient arithmetic coding (Arithmetic Coding) or Huffman coding (Huffman Coding) method, VLC code word sequence has one-way decodable coding. The codeword set of Huffman coding is obtained by probability statistics. In general, the source symbols with high probability of occurrence are encoded with shorter variable-length codewords, and the source symbols with low probability of occurrence are encoded with longer variable-length codewords. Long code word encoding.

[0021] From the perspective of probability and statistics, there is a direct relationship between the probabi...

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Abstract

This invention puts forward a method for jointly compiling Turbo codes of variable-length signs of source channels, which sorts the variable-length code word sequences output by the source coding according to code length and probability to carry out unequal error protection, in which, Turbo code of high code rate is applied for coding to the long code word appearing in small probability with less important level and Turbo code of low code rate is applied for coding to the short code word in large probability with important level.

Description

technical field [0001] The invention relates to a joint source-channel coding method in the field of communication coding, in particular to a joint source-channel coding method using a variable-length symbol as a Turbo code input unit for coding. Background technique [0002] In 1848, C.E. Shannon, the founder of communication coding theory, proposed the famous "Separation Theory" in his paper "A Mathematical Theory Of Communication. Bell System Technology Journal, 27: 379-423; 623-656, 1948." Theory), that is, the optimal communication system can be obtained by separately designing source coding and channel coding as independent links. On the basis of separation theory, the classical communication system model designed by people is shown in Figure 1. Shannon's "separation theory" is a conclusion obtained under ideal conditions. This theory assumes that source coding is the best compression, which can remove all redundancy in the source information, and channel coding is al...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/29H03M13/00
Inventor 凃国防刘建军张灿
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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