The Investigation of Mapping schemes for LDPC-Coded Modulated Systems
In conventional bit-interleaved coded modulation (BICM) system with convolutional codes, Gray mapping has been proved to be the best candidate over the additive white Gaussian noise (AWGN) channel. However, when it comes to LDPC-coded BICM and BICM with iterative decoding (BICMID) systems, Gray mapping doesn’t always promise better performance. A simple class of labeling maps that significantly improves the bit error rates (BER) is presented. Meanwhile, we found out that in these systems the overall performance of modulation depends not merely on the constellation schemes, but also the decoding strategy. Compared with the conventional parameters based Euclidean distance, mutual information theory is proved to be a more accurate tool. The simulation results show that only when combined with the suitable mapping and the “state-of-art decoding algorithms, the BICM system can give full play to their potential.
LDPC BICM BICM-ID mapping Euclidean distance mutual information BP algorithm
Ying Wang Kangming Jiang
Department of communication, Guangdong Power Dispatich and Controling Center
国际会议
南京
英文
1-6
2011-11-09（万方平台首次上网日期，不代表论文的发表时间）