| 一种规则变量节点度LTCodes编码方案 |
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| 引用本文： | 孙文珠,王洪玉,祝开艳,王洁,唐震洲. 一种规则变量节点度LTCodes编码方案[J]. 电子学报, 2014, 42(10): 1918-1924. DOI: 10.3969/j.issn.0372-2112.2014.10.008 |
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| 作者姓名： | 孙文珠 王洪玉 祝开艳 王洁 唐震洲 |
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| 作者单位： | 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 |
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| 基金项目： | 高等学校博士学科点专项科研基金(No ．20120041110011)；中央高校基本科研业务费专项资金(No ．DUT13JS09，No ．DUT14QY04)；国家自然科学基金 |
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| 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.
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| 关 键 词： | 喷泉码 规则变量节点度LT Codes 差错平台 度分布 |
| 收稿时间： | 2013-07-15 |
A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes |
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| SUN Wen-zhu,WANG Hong-yu,ZHU Kai-yan,WANG Jie,TANG Zhen-zhou. 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 |
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| Authors: | SUN Wen-zhu WANG Hong-yu ZHU Kai-yan WANG Jie TANG Zhen-zhou |
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| Affiliation: | 1. College of Computer Science and Technology, Shandong University of Technology, Zibo, Shandong, 255049, China;2. School of Information and Communication Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;3. College of Physics and Electronic Information Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China |
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| 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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| Keywords: | fountain code regular variable-node degree LT codes erasure floor degree distribution |
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