Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-08-22
2008-11-25
Odom, Curtis B (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S136000, C375S142000, C375S147000, C375S148000, C375S150000, C375S232000, C375S344000
Reexamination Certificate
active
07457347
ABSTRACT:
A method and apparatus for estimating and correcting baseband frequency error in a receiver. In one embodiment, an equalizer performs equalization on a sample data stream and generates filter tap values based on the equalization. An estimated frequency error signal is generated based on at least one of the filter tap values. A rotating phasor is generated based on the estimated frequency error signal. The rotating phasor signal is multiplied with the sample data stream to correct the frequency of the sample data stream. In another embodiment, a channel estimator performs channel estimation and generates Rake receiver finger weights based on at least one of the finger weights. An estimated frequency error signal is generated based on at least one of the finger weights.
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Beluri Mihaela
Demir Alpaslan
Pietraski Philip J.
Yang Rui
InterDigital Technology Corporation
Odom Curtis B
Volpe and Koenig P.C.
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