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Threshold Based D-SCFlip Decoding of Polar Codes

Desheng WANG, Jihang YIN, Yonggang XU, Xuan YANG, Gang HUA

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Summary :

The decoders, which improve the error-correction performance by finding and correcting the error bits caused by channel noise, are a hotspot for polar codes. In this paper, we present a threshold based D-SCFlip (TD-SCFlip) decoder with two improvements based on the D-SCFlip decoder. First, we propose the LLR fidelity criterion to define the LLR threshold and investigate confidence probability to calculate the LLR threshold indirectly. The information bits whose LLR values are smaller than the LLR threshold will be excluded from the range of candidate bits, which reduces the complexity of constructing the flip-bits list without the loss of error-correction performance. Second, we improve the calculation method for flip-bits metric with two perturbation parameters, which locates the channel-induced error bits faster, thus improving the error-correction performance. Then, TD-SCFlip-ω decoder is also proposed, which is limited to correcting up to ω bits in each extra decoding attempt. Simulation results show that the TD-SCFlip decoding is slightly better than the D-SCFlip decoding in terms of error-correction performance and decoding complexity, while the error-correction performance of TD-SCFlip-ω decoding is comparable to that of D-SCFlip-ω decoding but with lower decoding complexity.

Publication
IEICE TRANSACTIONS on Communications Vol.E106-B No.8 pp.635-644
Publication Date
2023/08/01
Publicized
2023/02/06
Online ISSN
1745-1345
DOI
10.1587/transcom.2022EBP3180
Type of Manuscript
PAPER
Category
Fundamental Theories for Communications

Authors

Desheng WANG
  China University of Mining and Technology
Jihang YIN
  University of Chinese Academy of Sciences
Yonggang XU
  China University of Mining and Technology
Xuan YANG
  China University of Mining and Technology
Gang HUA
  China University of Mining and Technology

Keyword