Open AccessPerformance optimisation for bit‐interleaved coded modulation with iterative demapping with max‐log‐ maximum a posterior detection
Author(s) -
Qian Chen,
Xie Qiuliang,
Zhao Peiyao,
Wang Zhaocheng
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0971
Subject(s) - computer science , algorithm , modulation (music) , bit error rate , focus (optics) , constellation , contrast (vision) , error detection and correction , decoding methods , mathematics , artificial intelligence , physics , astronomy , optics , acoustics
Max‐log‐maximum a posterior (MAP) detection is preferred in practical systems rather than log‐MAP because of its lower complexity, but also suffers from a considerable performance loss. In this study, the authors focus on the performance optimisation for (doped) bit‐interleaved coded modulation with iterative demapping schemes where max‐log‐MAP detection is employed. First, they study the effects of max‐log‐MAP detection to the extrinsic information transfer curves of the (doped) demapper and decoder, and reselect the constellation labelling. Second, they find that the small difference between max‐log‐MAP and log‐MAP detection in each iteration would be accumulated during the whole iterative procedure referred to as error accumulation, which causes a large performance loss, and consequently they propose some methods to control the error accumulation. Owing to the labelling reselection and error‐accumulation control, the proposed scheme exhibits several tenths to 1 dB gains, compared with the conventional schemes, while maintaining low complexity.