A variable iterative decoding scheme for various mappings based on BICM-ID

Bit-interleaved coded modulation with iterative decoding (BICM-ED), which can improve the BER performance within limited bandwidth, is getting extensive international attention. Symbol mapping, defined by the signal constellation and the bit labeling is the crucial design parameter to achieve a high coding gain for BICM-ED. In almost all the existing work, when the performance of various symbol mappings is compared, a fixed iterative decoding algorithm is considered. Since the fixed iterative algorithm increase the complexity of the receiver and incur larger delay, a modified iterative decoding scheme with variable iteration number for BICM-ID is proposed in this paper. Simulation results show that the variable iterative decoding scheme can reduce the meaningless iterations effectively without affecting the results of various mappings comparison.