UEP Constructions of Quasi-Cyclic Low-Density Parity-Check Codes via Masking

Chi Jen Wu, Chung-Hsuan Wang, Chi Chao Chao

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9 Scopus citations


In this paper, the algebraic constructions of quasi-cyclic low-density parity-check (QC-LDPC) codes with the unequal error protection (UEP) property are considered. A criterion for constructing such codes via the masking technique is proposed, based on which explicit conditions on the base parity-check matrices and masking matrices to achieve UEP are provided. We also give three specific constructions of UEP QC-LDPC codes. Furthermore, a sufficient condition to ensure strict UEP is presented. Simulation results demonstrate the superiority of our constructed codes over time-sharing schemes. The constructed codes also have competitive error performance against randomly constructed equal-error-protection LDPC codes and irregular UEP LDPC codes designed based on the degree distribution.

Original languageEnglish
Article number8012484
Pages (from-to)6271-6294
Number of pages24
JournalIEEE Transactions on Information Theory
Issue number10
StatePublished - Oct 2017


  • Low-density parity-check (LDPC) codes
  • masking
  • quasicyclic (QC) codes
  • unequal error protection (UEP)


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