Multi-Stage Decoding Scheme with Post-Processing for LDPC Codes to Lower the Error Floors

Beomkyu SHIN, Hosung PARK, Jong-Seon NO, Habong CHUNG

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Summary :

In this letter, we propose a multi-stage decoding scheme with post-processing for low-density parity-check (LDPC) codes, which remedies the rapid performance degradation in the high signal-to-noise ratio (SNR) range known as error floor. In the proposed scheme, the unsuccessfully decoded words of the previous decoding stage are re-decoded by manipulating the received log-likelihood ratios (LLRs) of the properly selected variable nodes. Two effective criteria for selecting the probably erroneous variable nodes are also presented. Numerical results show that the proposed scheme can correct most of the unsuccessfully decoded words of the first stage having oscillatory behavior, which are regarded as a main cause of the error floor.

Publication
IEICE TRANSACTIONS on Communications Vol.E94-B No.8 pp.2375-2377
Publication Date
2011/08/01
Publicized
Online ISSN
1745-1345
DOI
10.1587/transcom.E94.B.2375
Type of Manuscript
LETTER
Category
Fundamental Theories for Communications

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