Reliability-Based Joint Detection-Decoding Algorithm for Nonbinary LDPC-Coded Modulation Systems

This paper studies an extension and improvement of the joint detection-decoding algorithm for nonbinary LDPC-coded modulation systems. The iterative joint detection-decoding (IJDD) algorithm in [1] combines nonbinary LDPC decoding with signal detection based on the hard-message passing strategy, res...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 64; no. 1; pp. 2 - 14
Main Authors: Zhu, Min, Guo, Quan, Bai, Baoming, Ma, Xiao
Format: Journal Article
Language:English
Published: New York IEEE 01.01.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Coded modulation
Complexity
Complexity theory
Computer simulation
Decoding
Detectors
Error correcting codes
Iterative decoding
joint detection-decoding algorithm
majority-logic decoding
Modulation
Noise levels
nonbinary LDPC codes
Reliability
reliability-based decoding
Strategy
joint detection-decoding algorithm
reliability-based decoding
Coded modulation
majority-logic decoding
nonbinary LDPC codes
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:This paper studies an extension and improvement of the joint detection-decoding algorithm for nonbinary LDPC-coded modulation systems. The iterative joint detection-decoding (IJDD) algorithm in [1] combines nonbinary LDPC decoding with signal detection based on the hard-message passing strategy, resulting in significantly reduced decoding complexity. However, it applies only to majority-logic decodable nonbinary LDPC codes with high column weight. For nonbinary LDPC codes with low column weight, a noticeable performance loss will be incurred. To handle this problem, we propose a reliability-based iterative joint detection-decoding (also termed improved IJDD) algorithm, which combines the accumulated reliability of symbols based on the one-step majority-logic decoding (MLGD) algorithm and a Chase-like local list decoding algorithm. Simulation results show that the improved IJDD algorithm outperforms the IJDD algorithm by about 0.3 dB using nonbinary LDPC codes with high column weight, and by about 3 dB using nonbinary LDPC codes with low column weight (d v = 4), while maintaining the low complexity of decoding. Compared to the FFT-QSPA, the proposed algorithm has a performance degradation of 0.5 dB in the high column weight regime, and about 1 dB in the low column weight regime.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2015.2487454