基于规则变量节点度LT码的协作传输  

Cooperative transmission with regular variable-node degree LT codes

作　　者：祝开艳[1,2] 王洪玉[1] 孙文珠[3] 宋维波[2] 

机构地区：[1]大连理工大学电子信息与电气工程学部,辽宁大连116024 [2]大连海洋大学信息工程学院,辽宁大连116023 [3]山东理工大学计算机科学与技术学院,山东淄博255049

出　　处：《系统工程与电子技术》2015年第5期1163-1169,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61172058)资助课题

摘　　要：规则变量节点度Luby变换(Luby transform,LT)码能够改善传统LT码编码过程中随机选取邻居节点方式导致的差错平台现象。提出一种新的实现规则变量节点度LT的编码方法,利用数组的赋值和清空操作来实现信息符号度值规则化,降低了现有方法的编码复杂度,并利用对度分布的修正来改善解码瀑布区;将该编码方法应用到协作通信系统中,并分析了误符号率性能。实验结果表明,此方法能节省系统编解码时间,有效降低误符号率差错平台,减少成功解码所需的平均传输开销。Regular variable-node degree Luby transform （LT）codes can reduce the erasure floor of tradi- tional LT codes, which are caused by choosing neighbor nodes randomly in the encoding process. A novel enco- ding scheme for regular variable-node degree LT codes is proposed. Compared with existing methods, the pro- posed scheme utilizes assignments and empty operation for arrays to realize the regulation of information symbol value, reducing the complexity of existing methods. Meanwhile, by modifying the degree distribution, the wa- terfall area（avalanche area）in decoding regular variable-node degree LT codes is improved. Finally, the pro- posed coding method is applied to the cooperative communication system, and the symbol error rate is analyzed. Experimental resuhs show that this scheme can save system coding time, effectively reduce the symbol error rate erasure floor, and decrease the average transmission overhead required for the successful decoding.

关 键 词：协作通信 喷泉码 规则变量节点度Luby变换码 差错平台 度分布 

分 类 号：TN925[电子电信—通信与信息系统]