一种规则变量节点度LT Codes编码方案  

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

作　　者：孙文珠[1,2] 王洪玉[2] 祝开艳[2] 王洁[2] 唐震洲 

机构地区：[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

出　　处：《电子学报》2014年第10期1918-1924,共7页Acta Electronica Sinica

基　　金：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(No.61172058;No.61301130;No.61303210)

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.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 w ith 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.

关 键 词：喷泉码 规则变量节点度LT CODES 差错平台 度分布 

分 类 号：TN919.3[电子电信—通信与信息系统]