Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2007-10-23
2007-10-23
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S232000, C375S229000, C708S323000
Reexamination Certificate
active
10722915
ABSTRACT:
In a training operation for optimizing a multiplication coefficient for each tap of an FIR equalizer equalizing a read signal read from a recording medium, as a restricted coefficient updating vector applied for updating the multiplication coefficient for each tap of an FIR filter, a vector is utilized which is obtained by projecting, onto a plane perpendicular to a predetermined restricting conditioning vector, a coefficient updating vector determined based on an equalizer error between the output of the FIR equalizer and a reproduction output determined therefrom and a delayed input value for each tap of the FIR equalizer. As the restricting conditioning vector, a vector is utilized which is a difference between a subsequent coefficient vector obtained in the same condition immediately subsequent to and an antecedent coefficient vector obtained in the same condition immediately antecedent to a reference coefficient comprising the multiplication coefficient for the equalizer obtained upon calculating the equalizer error.
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Sawada Masaru
Sugawara Takao
Takatsu Motomu
Fujitsu Limited
Ghayour Mohammed
Ghulamali Qutub
Greer Burns & Crain Ltd.
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