Constrained coding for binary channels with high intersymbol interference

Razmik Karabed, Paul H. Siegel, Emina Soljanin

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Partial-response (PR) signaling is used to model communications channels with intersymbol interference (ISI) such as the magnetic-recording channel and the copper-wire channel for digital subscriber lines. Coding for improving noise immunity in higher order partial-response channels, such as the "extended" class-4 channels denoted EPR4, E2PR4, E3PR4, has become an important subject as the linear densities in magnetic recording approach those at which these partial-response channels are the best models of real channels. In this paper, we consider partialresponse channels for which ISI is so severe that the channels fail to achieve the matched-filter bound (MFB) for symbol error rate, assuming maximum-likelihood decoding. We show that their performance can be improved to the MFB by high-rate codes based on constrained systems, some of which may even simplify the Viterbi detectors relative to the uncoded channels. We present several examples of high-rate constrained codes for E2PR4 and E3PR4 channels and evaluate their performance by simulation.

Original languageEnglish (US)
Pages (from-to)1777-1797
Number of pages21
JournalIEEE Transactions on Information Theory
Issue number6
StatePublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


  • Constrained coding
  • Magnetic recording
  • Partial response


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