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Effects of base matrices on iterative decoding performance of irregular QC-LDPC codes.

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Titel: Effects of base matrices on iterative decoding performance of irregular QC-LDPC codes.
Autoren: Sheng Tong, Qinghua Guo, Jiangtao Xi, Yanguang Yu
Quelle: 2013, 7th International Conference on Signal Processing & Communication Systems (ICSPCS); 2013, p1-4, 4p
Abstract: The edge connections in factor graphs of quasi-cyclic (QC) LDPC codes, which affect their iterative decoding performance, are determined by their base matrices. In this paper, the effects of base matrices on the iterative decoding performance of QC-LDPC codes are investigated by using the recently proposed EXIT chart tool for protograph LDPC codes. Extensive experiments have been carried out and iterative decoding thresholds of QC-LDPC codes with the same degree distribution pair but base matrices having different structures and different dimensions have been obtained and compared. Experimental results show that 1) the base matrix structure affects not only the waterfall performance but also the error floor performance; base matrices having good waterfall performance may exhibit rather poor error floor performance. 2) by increasing the dimensions of base matrices for a given degree distribution, the threshold means are reduced while the ranges of threshold distributions are increased. 3) similar to the case of detailed represented LDPC codes, base matrices with sufficiently large dimensions may have thresholds surpassing the conventional ensemble threshold with the same degree distribution pair. Moreover, as a concrete example, an improved base matrix is designed for a rate-1/2 WiMax LDPC code. [ABSTRACT FROM PUBLISHER]
Copyright of 2013, 7th International Conference on Signal Processing & Communication Systems (ICSPCS) is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Effects of base matrices on iterative decoding performance of irregular QC-LDPC codes.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Sheng+Tong%22">Sheng Tong</searchLink><br /><searchLink fieldCode="AR" term="%22Qinghua+Guo%22">Qinghua Guo</searchLink><br /><searchLink fieldCode="AR" term="%22Jiangtao+Xi%22">Jiangtao Xi</searchLink><br /><searchLink fieldCode="AR" term="%22Yanguang+Yu%22">Yanguang Yu</searchLink>
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  Data: 2013, 7th International Conference on Signal Processing & Communication Systems (ICSPCS); 2013, p1-4, 4p
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The edge connections in factor graphs of quasi-cyclic (QC) LDPC codes, which affect their iterative decoding performance, are determined by their base matrices. In this paper, the effects of base matrices on the iterative decoding performance of QC-LDPC codes are investigated by using the recently proposed EXIT chart tool for protograph LDPC codes. Extensive experiments have been carried out and iterative decoding thresholds of QC-LDPC codes with the same degree distribution pair but base matrices having different structures and different dimensions have been obtained and compared. Experimental results show that 1) the base matrix structure affects not only the waterfall performance but also the error floor performance; base matrices having good waterfall performance may exhibit rather poor error floor performance. 2) by increasing the dimensions of base matrices for a given degree distribution, the threshold means are reduced while the ranges of threshold distributions are increased. 3) similar to the case of detailed represented LDPC codes, base matrices with sufficiently large dimensions may have thresholds surpassing the conventional ensemble threshold with the same degree distribution pair. Moreover, as a concrete example, an improved base matrix is designed for a rate-1/2 WiMax LDPC code. [ABSTRACT FROM PUBLISHER]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of 2013, 7th International Conference on Signal Processing & Communication Systems (ICSPCS) is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/ICSPCS.2013.6723960
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        Text: English
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      – TitleFull: Effects of base matrices on iterative decoding performance of irregular QC-LDPC codes.
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            NameFull: Sheng Tong
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            NameFull: Qinghua Guo
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            NameFull: Jiangtao Xi
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            NameFull: Yanguang Yu
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            – D: 01
              M: 01
              Text: 2013
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              Y: 2013
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