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Concatenated code system design for storage channels

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2 Author(s)
Ghrayeb, A. ; Dept. of Electr. & Comput. Eng., Arizona Univ., Tucson, AZ, USA ; Ryan, W.E.

A number of papers have 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

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:19 ,  Issue: 4 )

Date of Publication:

Apr 2001

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