A simplified structure for multistage decoding
Zhao Feng · Journal of China Institute of Communications · 2003
Two different decoding methods MSD and PDL are analyzed and compared. According to the relationship between the decoding structure of MSD and the mapping rules for modulation signals a new mapping rule for 8PSK and 16QAM are proposed, with which MSD structure can be simplified by using some parallel levels, which can greatly decrease the time delay and complexity of the MLC system. The simulation results show that the new MSD structure proposed doesn抰 loss any performance compared with traditional optimal mapping rules, furthermore the system performance would be improved at low SNR because the error propagation is avoided by using some parallel decoding structures. The generalization for other higher MPSK and MQAM signal constellations is straightforward.