基于叠加度的有限长系统LT码编码方案

发布时间：2018-02-24 08:03

本文关键词： 卢比变换码系统码中间节点性能叠加度分布　出处：《系统工程与电子技术》2017年04期 　论文类型：期刊论文

【摘要】：提出了一种基于叠加度的系统卢比变换(Luby transform,LT)码编码方案。与需要预编码的系统Raptor码或交织编码的准系统掺杂LT码方案不同,由掺杂度分量与弱鲁棒孤波分布进行叠加的叠加度分布,使得系统LT码的中间节点能以LT编码方式构造输出节点。理论分析了优化掺杂度分量叠加比例的系统LT码具有译码渐近性能,对给定码长k和冗余开销ε的编译码复杂度为O(k·ln(1/ε))。仿真验证了优化后的有限长系统LT码克服了系统Raptor码在信道删除概率大于0.01即出现误码平台的问题,在译码失败概率10-4时相对于准系统掺杂LT码的所需译码冗余开销可降低12%~20%。
[Abstract]:A scheme based on superposition of Lubby transform LT code is proposed, which is different from the scheme of system Raptor code which requires precoding or quasi-system-doped LT code with interleaved coding. The superposition distribution of the dopant degree component and the weak robust solitary wave distribution is obtained. The intermediate nodes of the system LT codes can be constructed by LT coding. The asymptotic decoding performance of the system LT codes with optimized additive ratio of dopant components is analyzed theoretically. For a given code length k and redundancy cost 蔚, the encoding and decoding complexity is o _ k 路lnn _ 1 / 蔚 / 蔚. The simulation results show that the optimized finite length system LT code overcomes the problem that the system Raptor code appears error platform when the channel deletion probability is greater than 0. 01. When the decoding failure probability is 10-4, the cost of decoding redundancy compared with quasi-system-doped LT codes can be reduced by 20%.
【作者单位】：哈尔滨工业大学深圳研究生院;
【基金】：国家自然科学基金(61201144,61371102) 国家高技术研究发展计划(863计划)(2014AA01A704) 深圳市基础研究项目(JCYJ20150930150304185,JCYJ20160328163327348) 哈工大创新基金项目(HIT.NSRIF.2017051)资助课题
【分类号】：TN911.22

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