Pulse or digital communications – Equalizers
Reexamination Certificate
2006-06-13
2006-06-13
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Equalizers
C375S343000, C708S422000, C708S425000
Reexamination Certificate
active
07061975
ABSTRACT:
In accordance with the invention, in a nonrecursive digital filter, the number of times each bit of input data passes through a shift register is reduced to save power. Despreading data is sent to a first shift register and a second shift register, each having a number of stages obtained by dividing the usual number of stages by two, and both shift registers alternately perform a shift operation at both edges of a shift clock. Multiplexers are provided for selecting the odd-numbered codes of reference codes stored in a reference-code register when the shift clock is in an OFF state and for selecting the even-numbered codes when the shift clock is in an ON state, and multiplexers are provided that perform the selections analogous to the above. The exclusive-OR output of the output of each stage of the first shift register and the outputs of the multiplexers, and the exclusive-OR output of the output of each stage of the second shift register, and the outputs of the multiplexers are added by the adder to obtain a correlation-strength output.
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Deppe Betsy L.
Oliff & Berridg,e PLC
Seiko Epson Corporation
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