Concatenated code system design for storage channels

Ali Ghrayeb, William E. Ryan

Research output: Contribution to journalArticle

24 Citations (Scopus)


A number of papers have recently been published on the concatenation of an outer code with a partial response (PR) channel, where the outer code is a turbo code, a convolutional code, or a low-density parity-check code. This paper deals with the second case, assuming EPR4 and modified extended EPR4 (MEEPR4) partial response (PR) targets. The goals in this work include 1) the joint optimization of interleaver and precoder for a fixed outer convolutional code and PR target, 2) the choice of optimal code rate for both PR targets assuming a Lorentzian model, and 3) an assessment of the performance of these codes in the presence of thermal asperities. We introduce mathematical and algorithmic tools for accomplishing these goals and present simulation results that support our approach. Among the positive results is the ability to lower the well-known error rate floor of these concatenated schemes for arbitrary PR channels.

Original languageEnglish
Pages (from-to)709-718
Number of pages10
JournalIEEE Journal on Selected Areas in Communications
Issue number4
Publication statusPublished - 1 Apr 2001


ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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