Weighted zigzag decodable fountain codes for unequal error protection

Yin Zhang, Yuli Zhao, Francis C.M. Lau, Bin Zhang, Zhiliang Zhu, Hai Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review


By combining bit-shift and exclusive-or operations, a weighted zigzag decodable fountain code is proposed to achieve an unequal error protection property. In the proposed scheme, the input symbols of different importance levels are first pre-coded into variable nodes using low-density parity-check codes. Then, bit-shift operations prior to exclusive-or are performed on the non-uniformly selected variable nodes to generate encoded symbols. An analysis of the erasure probabilities based on the and-or tree is further introduced. Simulation results show that by appropriately choosing the maximum bit-shift amount, the proposed weighted zigzag decodable fountain codes can successfully recover the more important input symbols prior to the less important ones.

Original languageEnglish
Pages (from-to)2082-2090
Number of pages9
JournalIET Communications
Issue number17
Publication statusPublished - Oct 2022

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering


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