Study on the girth problem of QC-LDPC codes based on voltage graph method
In order to solve the problem that girth affects the decoding performance of quasi-cyclic low-density parity-check codes,a voltage diagram method is proposed to study the girth of QC-LDPC codes.This method simplifies the calculation of the girth of the study,and proves the influence of increasing the girth range of the voltage graph by different assignment of the generating and non-generating edges of the voltage graph.