Iterative decoding algorithms of LDPC codes using TAP approach

  • Authors:

  • Manel Abdelhedi;Omessaad Hamdi;Ammar Bouallegue

  • Affiliations:

  • SYSCOM Laboratory, ENIT, Tunis, Tunisia;SYSCOM Laboratory, ENIT, Tunis, Tunisia;SYSCOM Laboratory, ENIT, Tunis, Tunisia

  • Venue:
  • GIIS'09 Proceedings of the Second international conference on Global Information Infrastructure Symposium
  • Year:
  • 2009

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Abstract

Low-density parity-check (LDPC) codes are based on random construction. Because of this randomness, it is not easy to analyze them with the traditional methods of communication theory. N. Sourlas [6] was the first to point out that LDPC codes have a similarity to Ising spin systems in statistical physics. Besides, it has been shown that the Belief-Propagation algorithm, the decoding algorithm of LDPC codes, is equivalent to the Thouless-Anderson-Palmer(TAP) [9] approach. In this paper, we develop the log-likelihood ratios-Belief Propagation (LLR-BP) and the BP-Based decoding algorithms with the TAP approach.