Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1997-05-21
1999-09-07
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 436, 360 51, H03D 100
Patent
active
059498315
ABSTRACT:
A method and apparatus are provided for data detection for a partial-response maximum-likelihood (PRML) data detection channel in a direct access storage device. A class-IV partial response (PR4) signal is applied to a PR4 Viterbi detector to provide a PR4 Viterbi output and is applied to a first matching delay circuit to provide a delayed PR4 signal. The PR4 Viterbi output is subtracted from the delayed PR4 signal and a resulting signal is applied to a first filter having a frequency response of 1/(1-.alpha.D.sup.2). The filtered output signal is applied to a second filter providing a second filtered output signal. The PR4 Viterbi output is applied to a second matching delay circuit to provide a delayed PR4 Viterbi output signal. The delayed PR4 Viterbi output is corrected responsive to the second filtered output signal. The first filter is an infinite impulse response (IIR) filter and the filtered output signal represents whitened noise and modified PRML error events. The second filter is a matched filter used to identify dominant error events.
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Coker Jonathan Darrel
Eleftheriou Evangelos S.
Galbraith Richard Leo
Hirt Walter
Bussan Matthew J.
Ghebretinsae Temesghen
International Business Machines - Corporation
Pennington Joan
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