Title :
Bit-reliability mapping in LDPC-coded modulation systems
Author :
Li, Yan ; Ryan, William E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Arizona Univ., Tucson, AZ, USA
Abstract :
In this paper, we propose a reliability-based mapping strategy in LDPC-coded modulation systems. Compared to conventional mapping methods, this strategy gives a 0.15 dB - 0.2 dB performance improvement with no added complexity. Extrinsic information transfer (EXIT) chart analyses are used to explain the reason for this improvement. LDPC-coded modulation systems with gray and natural labeling are studied. We show that the performances of gray-labeled systems are always superior.
Keywords :
Gray codes; iterative decoding; modulation coding; parity check codes; phase shift keying; quadrature amplitude modulation; EXIT; LDPC-coded modulation systems; PSK; QAM; bit-reliability mapping; extrinsic information transfer chart; gray-labeled systems; iterative decoding; AWGN; Communication system signaling; Demodulation; Information analysis; Iterative decoding; Labeling; MIMO; Modulation coding; Parity check codes; Signal mapping;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.200501010
