Joint iterative decoding for irregular-LDPC-based coded cooperation over a non-ideal relay channel

In this paper a new kind of simple-encoding irregular systematic LDPC codes suitable for one-relay coded cooperation is designed, where the proposed joint iterative decoding is performed effectively in the destination regarding the two different irregular LDPC codes used by the source and relay in ideal and non-ideal coded cooperation. The theoretical analysis and simulations show that this new cooperation scheme clearly outperforms the non-cooperative one under the same conditions, and the convergence of the iterative decoding is also significantly accelerated due to the mutual exchange of extrinsic information resulted by the counterpart decoders corresponding to the LDPC codes used by the source and relay in both ideal and non-ideal channels.