The effect of a precoder on serially concatenated coding systems with an ISI channel

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The performance of a serially concatenated system which includes a channel with memory preceded by a precoder as a rate-1 inner coder is presented. The effect of different precoders on the maximum-likelihood bit-error performance is analyzed. The precoder weight gain, which explains the good bit-error rate (BER) performance, is identified through a union bound analysis. Precoders are divided into two groups based on an analysis of the Euclidean distance and its multiplicity, and each precoder group shows a distinct BER curve behavior. It is shown that the BER curves for two precoder groups cross over each other. Convolutional codes are considered as outer codes in simulations on various intersymbol interference channels. Several important design considerations for the choice of precoders are derived based on the analysis and these are confirmed through simulations with an iterative decoding algorithm.

Original languageEnglish
Pages (from-to)1168-1175
Number of pages8
JournalIEEE Transactions on Communications
Issue number7
Publication statusPublished - 2001 Jul 1
Externally publishedYes



  • Concatenated coding system
  • ISI channel
  • Iterative decoding

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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