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Hybrid Coupled Serially Concatenated Codes.

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Název: Hybrid Coupled Serially Concatenated Codes.
Autoři: Yang, Chaojie, Zhao, Shancheng, Ma, Xiao
Zdroj: IEEE Transactions on Communications; Jul2022, Vol. 70 Issue 7, p4301-4315, 15p
Témata: ADDITIVE white Gaussian noise, ITERATIVE decoding, TURBO codes
Abstrakt: In this paper, we present a class of hybrid coupled serially concatenated codes (HC-SCC), in which coupling is achieved by re-encoding partial outputs from both the outer and the inner encoders. Firstly, we derive the exact density evolution (DE) equations over the binary erasure channels (BECs) for the HC-SCCs, which can be used to analyze the impact of the coupling ratios and the coupling memories on the performances of the HC-SCCs. Secondly, we present a genie-aided lower bound for the proposed HC-SCCs to estimate their error-floors. Thirdly, we use the DE equations to design randomly punctured HC-SCCs, including rate-compatible HC-SCCs. The analytical and the numerical results show that: 1) for comparable coupling memories, the iterative decoding thresholds of the proposed HC-SCC ensembles are better than those of the recently introduced spatially coupled serially concatenated code (SC-SCC) ensembles and the partially parity-coupled turbo code (PPC-TC) ensembles; 2) with outer coupling memory five and inner coupling memory five, the iterative decoding thresholds of the rate-compatible HC-SCCs over the BECs are 0.0003 away from the corresponding channel capacities for a wide range of coding rates; 3) simulation results over the additive white Gaussian noise (AWGN) channels and the BECs are provided to confirm the performance advantages of the HC-SCCs. Particularly, the simulation results show that the HC-SCCs admit lower error-floor than the SC-SCCs and the rate-compatible HC-SCCs perform better than the PPC-TCs, which are consistent with the results of DE analysis. [ABSTRACT FROM AUTHOR]
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  Data: Hybrid Coupled Serially Concatenated Codes.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Chaojie%22">Yang, Chaojie</searchLink><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Shancheng%22">Zhao, Shancheng</searchLink><br /><searchLink fieldCode="AR" term="%22Ma%2C+Xiao%22">Ma, Xiao</searchLink>
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  Data: IEEE Transactions on Communications; Jul2022, Vol. 70 Issue 7, p4301-4315, 15p
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  Data: <searchLink fieldCode="DE" term="%22ADDITIVE+white+Gaussian+noise%22">ADDITIVE white Gaussian noise</searchLink><br /><searchLink fieldCode="DE" term="%22ITERATIVE+decoding%22">ITERATIVE decoding</searchLink><br /><searchLink fieldCode="DE" term="%22TURBO+codes%22">TURBO codes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper, we present a class of hybrid coupled serially concatenated codes (HC-SCC), in which coupling is achieved by re-encoding partial outputs from both the outer and the inner encoders. Firstly, we derive the exact density evolution (DE) equations over the binary erasure channels (BECs) for the HC-SCCs, which can be used to analyze the impact of the coupling ratios and the coupling memories on the performances of the HC-SCCs. Secondly, we present a genie-aided lower bound for the proposed HC-SCCs to estimate their error-floors. Thirdly, we use the DE equations to design randomly punctured HC-SCCs, including rate-compatible HC-SCCs. The analytical and the numerical results show that: 1) for comparable coupling memories, the iterative decoding thresholds of the proposed HC-SCC ensembles are better than those of the recently introduced spatially coupled serially concatenated code (SC-SCC) ensembles and the partially parity-coupled turbo code (PPC-TC) ensembles; 2) with outer coupling memory five and inner coupling memory five, the iterative decoding thresholds of the rate-compatible HC-SCCs over the BECs are 0.0003 away from the corresponding channel capacities for a wide range of coding rates; 3) simulation results over the additive white Gaussian noise (AWGN) channels and the BECs are provided to confirm the performance advantages of the HC-SCCs. Particularly, the simulation results show that the HC-SCCs admit lower error-floor than the SC-SCCs and the rate-compatible HC-SCCs perform better than the PPC-TCs, which are consistent with the results of DE analysis. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Communications 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/TCOMM.2022.3175525
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        Text: English
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        Type: general
      – SubjectFull: ITERATIVE decoding
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              Text: Jul2022
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