The Design of Low-Iteration Protograph Codes for Rayleigh Fading Channels with Spatial Diversity

The contribution of this paper is to propose a new design framework for good low-iteration protograph low density parity check (LDPC) codes for fading channels where space spatial diversity is feasible. The performance of a protograph code of rate 1/2 proves that a power gain of 0.4 dB is achieved at frame error rate (FER) of 10−4 in comparison with the counterpart protograph accumulate-repeat-by-3-accumulate (AR3A) code, which has been shown to have the best performance in the fading environment [1]. Such power gain is meaningful for battery-operated devices in wireless communications systems.