On Construction of Low-Density Parity-Check Codes for Ultra Reliable and Low Latency Communications

Linqi Zou, Hao Yan, Jie Dong, Yong Li, Pingping Chen, Francis C.M. Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Low-density parity-check (LDPC) codes with protograph-based raptor-like (PBRL) structure have been chosen as the data channel coding scheme for the fifth-generation (5G) enhanced mobile broad band (eMBB) services. However, these 5G LDPC codes are not optimized for the scenarios of Ultra Reliable and Low Latency Communications (URLLC) and massive Machine Type Communications (mMTC) in which small transport block sizes are usually used. In this paper, a new method is proposed to construct PBRL LDPC codes for URLLC and mMTC. This method incorporates degree-distribution optimization, base matrix derived from parity-check matrix of quadratic residue codes, masking technique and modified progressive-edge-growth (PEG) algorithm. Simulation results show that the proposed PBRL LDPC codes outperform 5G LDPC short codes in terms of error-correcting performance.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Transactions on Communications
Publication statusPublished - 23 Apr 2024


  • 5G mobile communication
  • Codes
  • Finite element analysis
  • Parity check codes
  • PBRL LDPC code
  • QC-LDPC code
  • QR codes
  • quadratic residue code
  • Standards
  • Ultra reliable low latency communication

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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