NDLI: A new two-stage decoding scheme with unreliable path search to lower the error-floor for low-density parity-check codes

Content Provider	IET Digital Library
Author	Yang, Pilwoong Jun, Bohwan No, Jong Seon Park, Hosung
Abstract	In this study, the authors propose a new two-stage decoding scheme for low-density parity-check codes to lower the error-floor, which consists of the conventional belief propagation (BP) decoding algorithm as the first-stage decoding and the re-decodings with manipulated log-likelihood ratios (LLRs) of variable nodes as the second-stage decoding. In the first-stage decoding, an early stopping criterion is proposed for early detection of decoding failure and the candidate set of the variable nodes are determined, which can be partly included in the small trapping sets. In the second-stage decoding, the scores of the variable nodes in the candidate set are computed by the proposed unreliable path search algorithm and the variable nodes are sorted in ascending order by their scores for the re-decoding trials. Each re-decoding trial is performed by BP decoding algorithm with manipulated LLR of a selected variable node in the candidate set one at a time with the second early stopping criterion. The parallel unreliable path search algorithm is also proposed for practical application of the proposed algorithm. Numerical results show that the proposed early stopping criteria and the proposed decoding algorithms for the second-stage decoding can correct most of the unsuccessfully decoded codewords by the first-stage decoding in the error-floor region.
Starting Page	2173
Ending Page	2180
Page Count	8
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 14, Sep (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.0092
Journal	IET Communications
Publisher Date	2017-07-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Belief Propagation Decoding Algorithm BP Decoding Algorithm Code Combinatorial Mathematics Decoding Error-floor Region First-stage Decoding LLR Log-likelihood Ratios Low-density Parity-check Code Optimisation Technique Parallel Unreliable Path Search Algorithm Parity Check Code Search Problem Second-stage Decoding Two-stage Decoding Scheme
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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