A Sorting-Based Approximation of the Sum-Product Algorithm<br />10.14209/jcis.2003.6

Authors

  • Xiao-Yu Hu
  • Thomas Mittelholzer

Abstract

A complexity-and delay-efficient simplification of the sum-product algorithm (SPA) for decoding lowdensity parity-check (LDPC) codes is presented. The key feature of the new algorithm consists of a modification of the complexity-intensive and delay-causing update equations at the check nodes of the factor graph of the LDPC code. The modified update equations at a check node are based on ordering the reliability values of the incoming messages and on using a balanced tree topology to achieve optimum parallel processing. Furthermore, the complexity of the new algorithm can be adjusted: the least complex version of the algorithm corresponds to the so-called min-sum approximation, and the most complex version gives the full SPA.

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Published

2015-06-18

How to Cite

Hu, X.-Y., & Mittelholzer, T. (2015). A Sorting-Based Approximation of the Sum-Product Algorithm<br />10.14209/jcis.2003.6. Journal of Communication and Information Systems, 18(1). Retrieved from https://jcis.sbrt.org.br/jcis/article/view/325

Issue

Vol. 18 No. 1 (2003)

Section

Regular Papers

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Received 2015-06-18
Accepted 2015-06-18
Published 2015-06-18