Abstract

Because the LT code has the drawback of coding efficiency is not high, decoding time is too long and decoding probability is low, a mathematical method of limiting analysis is introduced to the distribution of LT code, which analysis the effects of different source data frame length, different parameters for LT code from principle, then a system program of variable frame length LT code is proposed, whose core idea is to make a appropriate design of frame length of the source data, split the source data and encode them separately to meet different performance requirements. Theoretical analysis and simulation results show that: Compared with the conventional LT codes, variable frame length LT codes can effectively improve the coding efficiency and decoding probability, enhance the feasibility of LT code in actual system.

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