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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
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)
