United States Patent 7,912,120
Pietraski , et al. March 22, 2011
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Method and apparatus for estimating and correcting baseband frequency error in a receiver
Abstract
A method and apparatus for estimating and correcting baseband frequency error in a receiver are disclosed. 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. Alternatively, 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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Inventors: Pietraski; Philip J. (Huntington Station, NY), Yang; Rui (Greenlawn, NY), Beluri; Mihaela (Glen Cove, NY), Demir; Alpaslan (Commack, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/688,242
Filed: January 15, 2010
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60625188 Nov., 2004
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Current U.S. Class: 375/232 ; 375/344
Current International Class: H03H 7/30 (20060101); H03H 7/40 (20060101); H03K 5/159 (20060101)
Field of Search: 375/136,142-144,147-152,229-236,344
PPP
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