Sampled amplitude read channel with simplified sequence detector

Details Sampled amplitude read channel with simplified sequence detector Sampled amplitude read channel with simplified sequence detector

1996-08-28

1999-01-19

Chung, Phung M.

Excavating

G06F 1100, H03M 1300

Patent

active

058621610

ABSTRACT:
This invention provides apparatus for reliably and efficiently reading data from a magnetic storage medium under the condition that adjacent magnetization regions are partially erased. A simplified nonlinear description of a read signal resulting from such partially erased magnetization regions is used to derive a state machine model of the read signal. The state machine model implicitly defines a sequence detector for demodulating recorded data from received samples. For a PR4 signal, the state machine has ten states; for an EPR4 signal, the state machine has eighteen states; and for an EEPR4 signal, the state machine has twenty-six states. The PR4 machine is further simplified using squaring and state sharing to provide state machine models with six and four states.

REFERENCES:
patent: 4910417 (1990-03-01), El Gamal et al.
patent: 5136593 (1992-08-01), Moon et al.
patent: 5317711 (1994-05-01), Bourekas et al.
patent: 5418452 (1995-05-01), Pyle
patent: 5473754 (1995-12-01), Folwell et al.
patent: 5488688 (1996-01-01), Gonzales et al.
patent: 5668678 (1997-09-01), Reed et al.
J Fitzpatrick and J K Wolf, "A Maximum Likelihood Detector or Nonlinear Magnetic Recording" IEEE Transactions on Magnetics, vol. 27 No. 6, Nov. 1991.
R. Cideciyan, F Dolivo, R Hermann, W Hirt, and W Schott, "A PRML System for Digital Magnetic Recording", IEEE Journal on Selected Areas in Communications, vol. 10, No. 1 Jan. 1992.
G. David Forney, Jr. "The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973.
Razmik Karabed and Paul Siegel, "Coding For Higher Order Partial Response Channels", SPIE, vol. 2605, pp. 115-126.
Inku Lee, Takashi Yamauchi, and John Cioffi, "Modified Maximum Likelihood Sequence Estimation in a Simple Partial Erasure Model", New Orleans Supercomm/Icc, May 1-5, 1994, pp.245-249.
J. Moon and B. Brickner, "Maximum Transition Run Codes For Data Storage Systems", IEEE Inter Mag., Seattle, WA., April 1996.
William Bliss and David Reed, "Analysis of HDD Thin-film-head Read Channel Performance as a Function of Media Thickness and RLL Code d Constraint", SPIE, vol. 2605, pp 264-275.

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