数据采集与处理2017，Vol.32Issue(5)：906-912,7.DOI:10.16337/j.1004-9037.2017.05.007
系统LT码在删除信道下的渐进性能分析及度分布设计
Asymptotic Performance Analysis and Degree Distribution Design for Systematic Luby Transform Codes over Binary Erasure Channel
摘要
Abstract
The asymptotic performance formula of systematic LT codes(SLT) in binary erasure channel (BEC) is firstly derived based on AND-OR tree analysis and its lower limit is given.Simulation results show that the actual bit error ratio(BER),the asymptotic performance and the lower limit match each other perfectly when the overhead is large enough.Then the optimization of degree distribution is proposed by the improved systematic linear programming(ISLP) model in accordance with the asymptotic performance.The optimized degree distribution is obviously superior to robust soliton distribution(RSD) and truncated degree distribution(TDD).Furthermore,the asymptotic behavior of the optimized degree distribution can be controlled by the given overhead and BER.In other words,the ideal BER can be obtained within the overhead we want,which also influences the overhead for complete decoding.Simulation results show that the overhead required for data recovery is close to that of we set.The comparison of BER,the overhead required for data recovery and the time of encoding and decoding for LT codes and SLT codes show that SLT codes have better performance than LT codes with more quick speed in data recovery.关键词
渐进性能/度分布/线性优化/系统LT码Key words
asymptotic behavior/degree distribution/linear optimization/systematic LT codes分类
信息技术与安全科学引用本文复制引用
华洁,徐大专,许生凯..系统LT码在删除信道下的渐进性能分析及度分布设计[J].数据采集与处理,2017,32(5):906-912,7.基金项目
国家自然科学基金(61471192,61371169)资助项目 （61471192,61371169）
江苏省普通高校研究生科研创新计划(SJLX15_0120)资助项目 （SJLX15_0120）
中央高校基本科研业务费专项资金资助项目. （）
