DVB-T2 LDPC decoder with perfect conflict resolution

Xiongxin Zhao, Zhixiang Chen, Xiao Peng, Dajiang Zhou, Satoshi Goto

    Research output: Contribution to journalArticle

    Abstract

    Currently most of LDPC decoders are implemented with the so-called layered algorithm for its implementation efficiency and relatively high decoding performance. However, not all of structured LDPC codes can be implemented with the layered algorithm directly because of the message updating conflicts within layers in the aposteriori information memory. In this paper we focus on the resolution of this kind of conflicts for DVB-T2 LDPC decoders. Unlike the previous resolutions, we directly implement the layered algorithm without modifying the paritycheck matrices (PCM) or the decoding algorithm. DVB-T2 LDPC decoder architecture is also proposed in this paper with two new techniques which guarantee conflict-free layered decoding. The PCM Rearrange technique reduces the number of conflicts and eliminates all of data dependency problems between layers to ensure high pipeline efficiency. The Layer Division technique deals with all remaining conflicts with a well-designed decoding schedule. Experiment results show that compared to state-of-the-art works we achieve a slight error-correcting performance gain for DVB-T2 LDPC codes.

    Original languageEnglish
    Pages (from-to)23-31
    Number of pages9
    JournalIPSJ Transactions on System LSI Design Methodology
    Volume5
    DOIs
    Publication statusPublished - 2012

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    Keywords

    • DVB-T2
    • Layered decoding
    • LDPC
    • Message updating conflict

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Computer Science Applications

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