Analysis and Simulation Performance of LT Codes

LT codes(Luby Transform Codes) as one of the Fountain codes and a kind of graph-based linear erasure codes,and can be applicated under Binary Erasure Channel(BEC).This paper gives the binary erasure channel model and describes the four design methods for LT codes degree distribution.The performance of LT code with short code length and long code length under the different channel deletion probabilities is analyzed and compared.The experimental results show that in the case of large deletion probability,so long as the decoder receives sufficient number of packets,the original data packet could be recovered with high probability.The research results given in this paper could serve as a reference for system to choose different LT code parameters.