Strictest (0,G/I) constraints achieved by high-rate block codes for class-IV PRML channels

Khaled A. S. Abdel-Ghaffar; Jos H. Weber

doi:10.1117/12.228238

8 December 1995 Strictest (0,G/I) constraints achieved by high-rate block codes for class-IV PRML channels

Khaled A. S. Abdel-Ghaffar, Jos H. Weber

Proceedings Volume 2605, Coding and Signal Processing for Information Storage; (1995) https://doi.org/10.1117/12.228238
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

Significant improvements in magnetic storage densities have been made feasible recently by the application of partial response signaling combined with maximum-likelihood sequence estimation (PRML). To enhance the performance of this technique when applied to the class- IV partial response channel, which is recognized as being appropriate to model the magnetic recording channel, it is often required to bound the number of consecutive zeros in the recorded data sequence by some positive integer G and the number of consecutive zeros in each of the odd and the even subsequences of the recorded data sequence by some positive integer I. Such a constraint is referred to as a (0, G/I) constraint. Codes are used to map arbitrary unconstrained sequences to (0, G/I) constrained sequences. We investigate the strictest possible constraints that can be achieved by block codes of high rates and compare between these constraints and the strictest possible constraints that can be achieved by arbitrary coding schemes.

Citation Download Citation

Khaled A. S. Abdel-Ghaffar and Jos H. Weber "Strictest (0,G/I) constraints achieved by high-rate block codes for class-IV PRML channels", Proc. SPIE 2605, Coding and Signal Processing for Information Storage, (8 December 1995); https://doi.org/10.1117/12.228238

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