Abstract
Two different ways of obtaining generalised low-density parity-check (LDPC) codes are considered. Lower bounds on the minimum distance, stopping distance and pseudodistance are derived for these codes using graph-based analysis. These bounds are generalisations of Tanner's bit- and parity-oriented bound for simple (LDPC) codes. The new bounds are useful in predicting the performance of generalised LDPC codes under maximum-likelihood decoding, graph-based iterative decoding and linear programming decoding, and rely on the connectivity of the Tanner graph.
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