CAJ | 학술논문

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。
LT Codes차착평태（Erasure Floor）유변량절점적최소도결정，규칙변량절점도LT Codes능구최대화변량절점적최소도，종이강저LT Codes적차착평태。해문제출일충신적규칙변량절점도LT Codes편마방법，해편마방법성거료현유방법중대변량절점도치사조표적배서조작，강저료현유방안적편마복잡도；통과대도분포적수정증가저도교험절점，사득규칙변량절점도LT Codes해마폭포구역（설붕구역）제전。방진결과표명해문방법여현유방법상비유효감소료편마시간，강저료성공해마소수적평균전수개소，가쾌료오부호솔수렴속도。
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 pa-per ,a novel encoding scheme for regular variable-node degree LT Codes is proposed .Compared with 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 .