Low Complexity Syndrome-Based Decoding Algorithm Applied to Block Turbo Codes

Byungkyu Ahn, Sungsik Yoon, Jun Heo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This paper presents a technique for reducing the decoding complexity of block turbo code with an extended Hamming code as a component code. In conventional decoding algorithms, when an input vector has a zero syndrome, complexity can be reduced by using the hard-input soft-output (HISO) algorithm. Although sufficient error correction can be achieved using hard decision decoding (HDD) of a component code, conventional methods have used the soft-input soft-output (SISO) algorithm for input vectors with a single error. However, when HDD is applied to all input vectors in which the syndrome is detected as a single error, performance loss occurs owing to the occasional presence of input vectors with triple errors. To solve this problem, we used two criteria for distinguishing between instances of single and triple errors. We maximized the applied rates of the HDD-based HISO algorithm depending on whether the criteria were satisfied. The SISO algorithm was applied when the two criteria were not met. In this case, the number of HDD usages can be reduced to half by removing duplicates or unnecessary candidate codewords. Simulation results show that the proposed algorithm can considerably reduce decoding complexity without performance loss compared with conventional algorithms.

Original languageEnglish
Pages (from-to)26693-26706
Number of pages14
JournalIEEE Access
Publication statusPublished - 2018 Apr 26

Bibliographical note

Funding Information:
This research was supported by the MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) support program (IITP-2018-2015-0-00385) supervised by the IITP (Institute for Information and Communications Technology Promotion).

Publisher Copyright:
© 2013 IEEE.


  • Block turbo code (BTC)
  • extended Hamming code
  • hard decision decoding (HDD)
  • hard-input soft-output (HISO)
  • soft-input soft-output (SISO)

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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