Bit-reliability mapping in LDPC-coded modulation systems

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...

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Bibliographic Details
Published in:IEEE communications letters 2005-01, Vol.9 (1), p.1-3
Main Authors: Li, Y., Ryan, W.E.
Format: Article
Language:English
Subjects:
Applied sciences
AWGN
Communication system signaling
Demodulation
Exact sciences and technology
Information analysis
Information, signal and communications theory
Iterative decoding
Labeling
MIMO
Modulation coding
Modulation, demodulation
Parity check codes
Signal and communications theory
Signal mapping
Telecommunications and information theory
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Summary: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.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.200501010