Efficient computation of EXIT functions for nonbinary iterative decoding

Jörg Kliewer, Soon Xin Ng, Lajos Hanzo

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


The calculation of nonbinary extrinsic information transfer charts for the iterative decoding of concatenated index-based codes is addressed. We show that the extrinsic information at the output of a constituent posteriori probability decoder can be calculated with very low complexity, where expensive histogram measurements are not required anymore. An example for turbo trellis-coded modulation demonstrates the capabilities of the proposed approach.

Original languageEnglish (US)
Pages (from-to)2133-2136
Number of pages4
JournalIEEE Transactions on Communications
Issue number12
StatePublished - Dec 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Extrinsic information transfer (EXIT) charts
  • Nonbinary iterative decoding
  • Turbo trellis-coded modulation (TTCM)


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