Title :
EXIT-Aided Bit Mapping Design for LDPC Coded Modulation with APSK Constellations
Author :
Cheng, Tao ; Peng, Kewu ; Song, Jian ; Yan, Keqian
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
fDate :
6/1/2012 12:00:00 AM
Abstract :
In this paper, the bit mapping technique is applied to the low-density parity-check (LDPC) coded modulation system with Gray-APSK constellations for the first time. A multi-grid searching algorithm (MGSA) based on extrinsic information transfer (EXIT) chart analysis is first proposed to optimize the bit mapping distribution, after which a low-complexity bit mapper consisting of a structural bit interleaver and a demultiplexer (DEMUX) is devised. Compared to the LDPC coded QAM system specified in DVB-T2, the proposed APSK system with the optimized DEMUX can achieve up to 0.83dB gain under additive white Gaussian noise (AWGN) channel.
Keywords :
AWGN channels; communication complexity; demultiplexing equipment; interleaved codes; modulation coding; parity check codes; search problems; APSK system; AWGN channel; EXIT chart analysis; EXIT-aided bit mapping design; LDPC coded modulation; MGSA; additive white Gaussian noise channel; bit mapping distribution; demultiplexer; extrinsic information transfer; gray-APSK constellation; low-complexity bit mapper; low-density parity-check coded modulation system; multigrid searching algorithm; optimized DEMUX; structural bit interleaver; Bit error rate; Decoding; Digital video broadcasting; Parity check codes; Quadrature amplitude modulation; Signal to noise ratio; Bit mapping; EXIT; Gray-APSK; LDPC;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.041112.112436
