Satellite network channel coding method

A technology of channel coding and satellite network, which is applied in the direction of channel coding adjustment, transmission modification based on link quality, error correction/detection using block codes, etc. It can solve the problems of decoding performance degradation and high decoding complexity, and achieve The effect of reducing redundant operations, reducing the complexity of encoding and decoding, and improving performance

Active Publication Date: 2018-05-04
DALIAN UNIV
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Problems solved by technology

[0005] Aiming at the problem that the most practical robust solitary wave distribution is relatively high in encoding and decoding complexity in LT codes, and the decoding performance drops significantly when the number of input symbols is small, a new truncated robust solitary wave fixed degree is proposed. Distribution (C_RSSD)

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Embodiment Construction

[0045] A degree distribution optimization algorithm in LT codes, comprising the following steps:

[0046] 1. Improve the fixed degree distribution

[0047]The fixed degree distribution is a kind of degree distribution with strong practicability that people have summarized in long-term engineering practice applications. It is mainly suitable for LT codes with long code lengths. For LT codes with short code lengths, since the degree is The probability of 1 is small, resulting in too few encoded packets with a degree of 1, which makes it easy to fail in decoding. The fixed distribution is referred to as SD (StationaryDistribution), denoted as S(x), expressed in the form of a generator polynomial as:

[0048]

[0049] In formula (1.1), S d Represents the probability value of degree d. Next, adjust the fixed degree distribution: to increase the probability value of degree 1, it is necessary to reduce the probability values ​​of other degree values. In order to maintain the pr...

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Abstract

The invention relates to a satellite network channel coding method, and belongs to the field of satellite channel coding. The problem that the complexity of the coding and decoding in the LT code is relatively high, and when the number of input symbols is small, the decoding performance drops significantly. The technical point is as follows: cascading an LT code with an LDPC code as channel codingof the satellite network, wherein the degree distribution in the LT code adopts truncated robust soliton fixed degree distribution C_RSSD. The effect is that when the truncated robust soliton fixed degree distribution is used for performing LT coding and decoding, the probability of small values can be increased, the average degree value can be reduced, the coding and decoding overhead can be reduced, and the decoding success rate can be improved.

Description

[0001] This application is a divisional application with application number 2017105807665, application date 2017-07-17, and invention name "degree distribution optimization algorithm and equipment in LT code". technical field [0002] The invention belongs to the field of satellite channel coding, studies emerging digital fountain codes, and proposes a new degree distribution optimization algorithm, namely Chopped Robust Soliton Stationary Distribution (C_RSSD). This algorithm effectively improves the performance of encoding and decoding of LT codes in fountain codes. Background technique [0003] With the rapid development of information technology and the increasing abundance of information applications, people put forward higher and higher requirements for the quality and capacity of satellite communication systems, which directly promotes the development of satellite communication channel coding. Satellite links have the characteristics of being susceptible to space envi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH03M13/05H04L1/0009H04L1/0056H04L1/0057H04L1/0061H04L1/0063H04L1/0064
Inventor 魏德宾潘成胜李金明杨力
Owner DALIAN UNIV
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