Coding for two-head recording systems

A reduction in the track width in disc-recording systems results in a desirable increase in areal density, but also in the undesirable appearance of inter-track interference (ITI) and loss of signal-to-noise ratio (SNR). One way the effects of ITI may be alleviated is through the use of multiple-head systems simultaneously writing and reading a number of adjacent tracks. In this paper we investigate the performance of two-track detectors, and design codes that combat two-dimensional interference patterns, ISI in the axial dimension, and ITI in the radial dimension, and recover the loss in SNR due to track-narrowing. Slidingblock decoders and reduced-complexity Viterbi detectors are also designed for these codes, which are seen to more than compensate for the performance loss for a large range of ITI levels

[1]  John M. Cioffi,et al.  Multichannel digital magnetic recording , 1992, [Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications.

[2]  John M. Cioffi,et al.  Achievable radial information densities in magnetic recording systems , 1992, [Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE.

[3]  Don Coppersmith,et al.  Algorithms for sliding block codes - An application of symbolic dynamics to information theory , 1983, IEEE Trans. Inf. Theory.

[4]  Lineu C. Barbosa,et al.  Maximum likelihood sequence estimators: A geometric view , 1989, IEEE Trans. Inf. Theory.

[5]  John M. Cioffi,et al.  A decision feedback equalizer for multiple-head digital magnetic recording , 1991, ICC 91 International Conference on Communications Conference Record.

[6]  Paul H. Siegel,et al.  Matched spectral-null codes for partial-response channels , 1989, IEEE Trans. Inf. Theory.

[7]  Jose M. F. Moura,et al.  Magnetic recording channel model with intertrack interference , 1991 .

[8]  P.H. Siegel,et al.  Modulation and coding for information storage , 1991, IEEE Communications Magazine.

[9]  Brian H. Marcus,et al.  Finite-State Modulation Codes for Data Storage , 2004 .

[10]  L.C. Barbosa.  Simultaneous detection of readback signals from interfering magnetic recording tracks using array heads , 1990, International Conference on Magnetics.

[11]  J. Wolf,et al.  A new class of two-dimensional RLL recording codes , 1992 .

[12]  Brian H. Marcus,et al.  Sliding-block coding for input-restricted channels , 1988, IEEE Trans. Inf. Theory.

[13]  Michael W. Marcellin,et al.  Two-Dimensional Modulation Codes , 1992, IEEE J. Sel. Areas Commun..

[14]  John M. Cioffi,et al.  Performance of digital magnetic recording with equalization and offtrack interference , 1991 .

[15]  Costas N. Georghiades,et al.  On coding in multi-track, multi-head, disk recording systems , 1993, Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference.