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Channel coding transmission method based on unequal mistake protection fountain code

A technology of error protection and channel coding, which is applied in the field of fountain codes and channel coding, can solve the problems of weakening secondary important data protection, etc., and achieve the effect of improving anti-error characteristics, improving reliability, and fast speed

Inactive Publication Date: 2011-10-26
TIANJIN UNIV
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Problems solved by technology

These two schemes can strengthen the protection of important data, but greatly weaken the protection of less important data

Method used

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  • Channel coding transmission method based on unequal mistake protection fountain code
  • Channel coding transmission method based on unequal mistake protection fountain code
  • Channel coding transmission method based on unequal mistake protection fountain code

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Embodiment Construction

[0024] The present invention proposes a new channel coding method, which uses the expansion factor to virtually increase the degree distribution, and then uses EWF (Expanding Window Fountain) codes, combined with window technology, to achieve unequal error protection. Compared with other fountain codes, the proposed The invention has obvious unequal error protection and anti-error characteristics. The present invention is divided into three parts: channel coding, transmission and channel decoding. The encoding technology that the present invention adopts is as follows:

[0025] 1) Channel coding:

[0026] 1. If figure 1 As shown, the K data sources are divided into r importance levels according to their importance, that is, s 1 ,s 2 ,L,s r-1 ,s r , where the data length of the i-th layer is k i =a i · K, a i Represents the proportion of the i-th layer data to the original source data,

[0027] i ∈ (1, r);

[0028] 2. For the r-layer data obtained by (1), virtual e...

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Abstract

The invention belongs to the communication technology field, relating to a channel coding transmission method based on an unequal mistake protection fountain code. The method comprises the following steps: classifying a signal source according to importance; carrying out virtual expansion on each r layer data according to expansion factor; putting obtained virtual extension layer data into each window; carrying out progressive analysis on the window data with and / or tree algorithm; carrying out LT coding and index replacement according to robustness solitary wave degree; obtaining coding word; carrying out transmission; carrying out decoding. According to the invention, protection of important data is reinforced, simultaneously protection of less important data is not decreased to guarantee to reliable transmission of data.

Description

technical field [0001] The invention relates to a fountain code and a channel coding method, belonging to the communication field. Background technique [0002] In recent years, the digital fountain code can adapt to more channels because of its non-fixed code rate, and the codec adopts linear operation, and the computational complexity is low. As a forward error correction code, the digital fountain code does not need feedback. Features are attracting more and more attention. M. Luby proposed the concept of fountain codes in 1998, and in 2002 proposed the first efficient and practical fountain codes——LT codes. Later, Shokrollahi et al. further improved the time-consuming performance of fountain code encoding and decoding, and proposed a new fountain code, Raptor code. [0003] Fountain Code is widely used on the Internet, wireless network, mobile network and satellite network to provide files, data and multimedia transmission. The original fountain code is equal protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 侯永宏侯春萍倪春亚李伟刘春源高志敏王丕超
Owner TIANJIN UNIV
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