iLDPC coded RCM scheme with optimised interleaver

In this study, an irregular low-density parity-check (iLDPC) coded rate compatible modulation (iLDPC-RCM) is proposed. A particularly designed interleaver is inserted between LDPC and RCM such that a fast convergence and a low bit-error rate (BER) can be achieved. The combination of strong error correction capability of irregular LDPC code and the seamless adaptation of RCM enables the proposed scheme to achieve a robust and spectrally efficient transmission over time-varying channels. In addition, a joint belief propagation algorithm is proposed to lower the BER of iLDPC-RCM and speed up the convergence of iterative decoding. Simulation results show that the proposed iLDPC-RCM improves the BER and throughput performance while maintaining an acceptable computational complexity at the same time, validating its advantages over the regular LDPC coded RCM with the same coding rate.