Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1997-03-31
1999-09-21
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
341 59, 3647242, 375233, G11B 5035, H03M 700, G06F 1710
Patent
active
059561955
ABSTRACT:
An information handling system, such as a magnetic disk drive, includes a data channel which has a method and apparatus for detecting binary symbols from a received signal subject to intersymbol interference and additive white Gaussian noise using a three dimensional observation space with orthogonal coordinate axes. Each of three consecutive synchronous observation samples of the received signal corresponding unambiguously to an axis in the observation space. A decision feedback equalizer removes intersymbol interference terms associated with prior detector outputs. A plurality of linear classifiers are used to partition the observation space. The second and/or third sample of the equivalent channel response is constrained relative to the first for the purpose of simplifying the linear classifiers. Boolean logic functions to decide into which decision region of the observation space a sample maps into. Incorporation of modulation coding constraints reduce the probability of error by increasing the Euclidean distance between symbols in the observation space. Symbol estimates are produced synchronously with a delay of two with respect to the current observation sample.
REFERENCES:
patent: 4945538 (1990-07-01), Patel
patent: 4985902 (1991-01-01), Gurcan
patent: 5132988 (1992-07-01), Fisher et al.
patent: 5136593 (1992-08-01), Moon et al.
patent: 5282216 (1994-01-01), Patel et al.
patent: 5327440 (1994-07-01), Fredrickson et al.
patent: 5357520 (1994-10-01), Arnett et al.
patent: 5370863 (1994-12-01), Barney et al.
patent: 5430661 (1995-07-01), Fisher et al.
patent: 5438460 (1995-08-01), Coker et al.
patent: 5731768 (1998-03-01), Tsang
patent: 5793759 (1998-08-01), Rakib et al.
patent: 5805478 (1998-09-01), Kim
Brickner, B., et al., "3D-110 Derivation of a Novel FDTS/DF t+2 MTR+2 Coded DFE-110 Channel", Center for Micromagnetics and Information Technologies, U of M, 1-7, (1996).
Brickner, B., et al., "A High Dimensional Signal Space Implementation of FDTS/DF", IEE Transactions on Magnetics, 32, 3941-3943, (1996).
Brickner, B., et al., "Architectures for 3D-110 Detection", Mint Research Review, 1-2, (1996).
Brickner, B., et al., "High Data Rate Detection for 3D-110 Channels", IEEE Transactions on Magnetics, 33, 2806-2808, (1997).
Brickner, B., et al., "Two-Bit Wide 3D-110 Detection", CDSLab Report No. BB-96-04, U of M, 1-6, (1996).
Kenney, J.G., et al., "Multi-Level Decision Feedback Equalization for Saturation Recording", IEEE Transactions on Magnetics, 29, 2160-2171, (1993).
Moon, J., "Signal Processing in Data Storage Systems", IEEE Signal Processing (not in print), 1-38, (1997).
Moon, J., et al., "Efficient Sequence Detection for Intersymbol Interference Channels with Run-Length Constraints", IEEE Transactions on Communications, 42, 9, 2654-2171, (1994).
Patel, A.M., "A New Digital Signal Processing Channel for Data Storage Products", IEEE Transactions on Magnetics, 27, 6, 4579-4584, (1991).
Brickner Barrett J.
Moon Jaekyun
Neal Regina Y.
Psitos Aristotelis M.
Regents of the University of Minnesota
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