A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes

SUN Wen-zhu; WANG Hong-yu; ZHU Kai-yan; WANG Jie; TANG Zhen-zhou

doi:10.3969/j.issn.0372-2112.2014.10.008

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A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes

更新时间：2025-07-16

- A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes
- Acta Electronica Sinica Vol. 42, Issue 10, Pages: 1918-1924(2014)
- 作者机构：
  
  1. 山东理工大学计算机科学与技术学院,山东,淄博,255049
  2. 大连理工大学信息与通信工程学院,辽宁,大连,116024
  3. 温州大学物理与电子信息工程学院,浙江,温州,325035
  4. 山东理工大学计算机科学与技术学院,山东,淄博,255049
  5. 大连理工大学信息与通信工程学院,辽宁,大连,116024
  6. 温州大学物理与电子信息工程学院,浙江,温州,325035
- 作者简介：
- 基金信息：
  
  Research Fund for the Doctoral Program of Higher Education of China (No.20120041110011);Fundamental Research Funds for the Central Universities (No.DUT13JS09, No.DUT14QY04);National Natural Science Foundation of China (No.61172058, No.61301130, No.61303210)
- DOI：10.3969/j.issn.0372-2112.2014.10.008
  CLC： TN919.3
- Published：2014
- 稿件说明：
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SUN Wen-zhu, WANG Hong-yu, ZHU Kai-yan, et al. A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes[J]. Acta Electronica Sinica, 2014, 42(10): 1918-1924.
DOI：

SUN Wen-zhu, WANG Hong-yu, ZHU Kai-yan, et al. A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes[J]. Acta Electronica Sinica, 2014, 42(10): 1918-1924. DOI： 10.3969/j.issn.0372-2112.2014.10.008.

摘要

LT Codes差错平台(Erasure Floor)由变量节点的最小度决定

规则变量节点度LT Codes能够最大化变量节点的最小度

从而降低LT Codes的差错平台.该文提出一种新的规则变量节点度LT Codes编码方法

该编码方法省去了现有方法中对变量节点度值查找表的排序操作

降低了现有方案的编码复杂度；通过对度分布的修正增加低度校验节点

使得规则变量节点度LT Codes解码瀑布区域(雪崩区域)提前.仿真结果表明该文方法与现有方法相比有效减少了编码时间

降低了成功解码所需的平均传输开销

加快了误符号率收敛速度.

Abstract

The erasure floor of LT Codes is mainly determined by the minimum degree of variable-nodes.Regular variable-node degree LT Codes can maximize the minimum degree of variable-nodes and improve the erasure floor of LT Codes.In this paper

a novel encoding scheme for regular variable-node degree LT Codes is proposed.Compared with existing methods

the proposed scheme is lightweight due to the elimination of the sorting operations involved in the look-up table.Meanwhile

by adding check nodes with low degree through modifying the degree distribution

the waterfall area (avalanche area) in decoding regular variable-node degree LT Codes is improved.Simulation results show that this scheme reduces the encoding time and the average overhead

and accelerates the convergence rate of symbol error rate curve efficiently.

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