A Class of QC-LDPC Codes with Low Encoding Complexity and Good Error Performance

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Original languageEnglish
Article number5403623
Pages (from-to)169-171
Journal / PublicationIEEE Communications Letters
Issue number2
Publication statusPublished - Feb 2010
Externally publishedYes


We propose a novel approximate lower triangular structure for the parity part of the parity-check matrix of QC-LDPC codes. About half of the non-zero elements in the parity part are set to locate on the upper diagonal while the remaining non-zero elements can be located almost anywhere within the lower triangular area, provided certain rules are observed. Compared with the typical dual-diagonal structure, the proposed structure requires very similar encoding complexity and produces lower error rates over an AWGN channel. © 2010 IEEE.

Research Area(s)

  • Approximate lower triangular structure, Encoding complexity, QC low-density-parity-check (LDPC) codes

Citation Format(s)