Turbo equalization: Principles and new results

Michael Tüchler, Ralf Koetter, Andrew C. Singer

Research output: Contribution to journalArticlepeer-review


We study the turbo equalization approach to coded data transmission over channels with intersymbol interference. In the original system invented by Douillard et al., the data are protected by a convolutional code and the receiver consists of two trellis-based detectors, one for the channel (the equalizer) and one for the code (the decoder). It has been shown that iterating equalization and decoding tasks can yield tremendous improvements in bit error rate. We introduce new approaches to combining equalization based on linear filtering with decoding. Through simulation and analytical results, we show that the performance of the new approaches is similar to the trellis-based receiver, while providing large savings in computational complexity. Moreover, this paper provides an overview of the design alternatives for turbo equalization with given system parameters, such as the channel response or the signal-to-noise ratio.

Original languageEnglish (US)
Pages (from-to)754-767
Number of pages14
JournalIEEE Transactions on Communications
Issue number5
StatePublished - May 2002


  • Decoding
  • Equalization
  • Intersymbol interference
  • Iterative methods
  • Turbo equalization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'Turbo equalization: Principles and new results'. Together they form a unique fingerprint.

Cite this