A class of QC-LDPC codes with low encoding complexity and good error performance

Wai M. Tam, Chung Ming Lau, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


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.
Original languageEnglish
Article number5403623
Pages (from-to)169-171
Number of pages3
JournalIEEE Communications Letters
Issue number2
Publication statusPublished - 1 Feb 2010


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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Modelling and Simulation


Dive into the research topics of 'A class of QC-LDPC codes with low encoding complexity and good error performance'. Together they form a unique fingerprint.

Cite this