Analysis of an algorithm for irregular LDPC code construction

This work presents a rigorous analysis of an algorithm proposed by Tian et al. (2003) for the construction of irregular LDPC codes with reduced stopping sets and low error floors. Computation of the expected number of stopping sets of a given size proves that the algorithm significantly outperforms a random construction. We show that the algorithm provably reduces the expected number of stopping sets up to a certain size (based on the input parameters). The expected number of cycles of a given size is computed for both constructions.