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Digital signal processing and coding are increasingly being recognized as a cost-efficient approach in achieving substantial areal density gains while preserving the high reliability of disk drives, although historically advances in head and media technologies have been the main driving force behind areal density growth. The recent advances in capacity-approaching codes hold the promise to push the areal density to the ultimate limit. In this article the various configurations regarding the interplay between soft detection and soft decoding through an iterative process, as it applies to the magnetic recording channel, are presented. In particular, the state of the art in turbo and turbo-like coding, including LDPC coding is reviewed, and the serial concatenation of these coding schemes with inner generalized PR channels in a turbo-equalization structure is described.
By: Ajay Dholakia, Evangelos Eleftheriou, Marc Fossorier and Thomas Mittelholzer
Published in: IEEE Communications Magazine, volume 42, (no 2), pages 122-30 in 2004
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