Modified Constructing of LT Codes
Tang Kun · Video Engineering · 2011
This paper introduces a new concept-iterative depth(ID),based on analyzing the feature of channel information in the decoding processing of LT codes with Belief Propagation(BP) algorithm.Improving Progressive Edge Growth(PEG),a construction method for LT codes,by the relation between the ID and the error robustness capability of coding-symbols.The purpose is to find the feature of good Tanner graphs for LT codes.Compared to classical PEG,LT codes using improved PEG has several merits such as the degree distribution of input nodes is strict Poisson distribution and there are no error in those nodes of degree 1.This merits improve the error robustness capability of LT codes enormously.