A Novel Encoding Scheme for Regular Variable-Node Degree LT Codes
Sun Wen-zh · Dianzi xuebao · 2014
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.