Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-03-07
2006-03-07
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S368000, C375S350000, C375S354000, C714S744000, C714S792000, C714S704000
Reexamination Certificate
active
07010065
ABSTRACT:
A method and apparatus are provided for word synchronization with large coding distance and fault tolerance for a partial-response maximum-likelihood (PRML) data channel in a direct access storage device (DASD). A Viterbi detector receives equalized PR4 samples including a predefined word synchronization pattern. The Viterbi detector is a dedicated detector optimized for detecting the predefined word synchronization pattern. The Viterbi detector includes a two-state Viterbi trellis and a word synchronization detector for the two-state Viterbi trellis. The predefined word synchronization pattern includes only even length magnets. The predefined word synchronization pattern is a repetition code including pairs of ones and pairs of zeros and includes multiple pattern match sequences. The Viterbi detector is optimized with branches removed from the Viterbi trellis, thus increasing coding distance. The two-state Viterbi trellis and word synchronization detector of the Viterbi detector operate on a 2T basis, where 1/T is the sample rate.
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Cideciyan Roy Daron
Coker Jonathan Darrel
Eleftheriou Evangelos S.
Galbraith Richard Leo
Truax Todd Carter
Hitachi Global Storage Technologies - Netherlands B.V.
Liu Shuwang
Pennington Joan
Zheng Eva
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