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2nd International ICST Conference on Communications and Networking in China

Research Article

Lowering the Error Floor of LDPC Codes by a Two-stage Hybrid Decoding Algorithm

Cite
BibTeX Plain Text
  • @INPROCEEDINGS{10.1109/CHINACOM.2007.4469460,
        author={Yueguang Bian and Youzheng Wang and Jing Wang},
        title={Lowering the Error Floor of LDPC Codes by a Two-stage Hybrid Decoding Algorithm},
        proceedings={2nd International ICST Conference on Communications and Networking in China},
        publisher={IEEE},
        proceedings_a={CHINACOM},
        year={2008},
        month={3},
        keywords={AWGN  Belief propagation  Equations  Feedback  Geometry  Iterative algorithms  Iterative decoding  Parity check codes  Processor scheduling  Tin},
        doi={10.1109/CHINACOM.2007.4469460}
    }
    
  • Yueguang Bian
    Youzheng Wang
    Jing Wang
    Year: 2008
    Lowering the Error Floor of LDPC Codes by a Two-stage Hybrid Decoding Algorithm
    CHINACOM
    IEEE
    DOI: 10.1109/CHINACOM.2007.4469460
Yueguang Bian1, Youzheng Wang1, Jing Wang1
  • 1: Tsinghua University, China

Abstract

In this paper, a hybrid decoding scheme is proposed to lower the error floor of low-density parity-check codes. With the observation that some error bits’ LLR values oscillate throughout iterative decoding procedure, a “feedback BP” (FBP) decoding algorithm is presented as second-stage decoding cell to reduce the phenomena of oscillations. The hybrid decoding scheme, which consists LLR-BP decoding algorithm and FBP decoding algorithm, detects errors in the codewords obtained by using the parity check equations of LDPC codes. Simulation results show that the new decoding scheme exhibits a lower error floor than that of belief propagation decoding algorithm in the moderate and high SNR region.

Keywords
AWGN , Belief propagation , Equations , Feedback , Geometry , Iterative algorithms , Iterative decoding , Parity check codes , Processor scheduling , Tin
Published
2008-03-07
Publisher
IEEE
Modified
2011-07-17
http://dx.doi.org/10.1109/CHINACOM.2007.4469460
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