Security gap performance of some LDPC code constructions

In this paper, we assess the behavior of some low-density parity-check (LDPC) code design techniques over the additive white Gaussian (AWGN) wire-tap channel, in terms of security gap. We consider the progressive edge growth (PEG) construction algorithm as a reference, and compare its performance with that of four approaches for designing structured LDPC codes. We consider both systematic and non-systematic transmissions, and show that some structured code design techniques are able to achieve comparable or even better performance than the PEG algorithm over the considered channel, while taking advantage of their simpler encoding and decoding procedures.