InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,570,690
Pietraski , et al. August 4, 2009

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Adaptive equalizer with a dual-mode active taps mask generator and a pilot reference signal amplitude control unit


Abstract
An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch and a pilot amplitude reference unit used to minimize the dynamic range of the equalizer filter. A dynamic mask vector is used to mask active taps generated by the equalizer tap update unit when an unmasked signal output by the equalizer filter is selected by the switch to generate an error signal fed to the equalizer tap update unit. A fixed mask vector is used to mask active taps generated by the equalizer tap update unit when a masked signal output by the equalizer filter is used to generate the error signal.


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Inventors: Pietraski; Philip J. (Huntington Station, NY), Beluri; Mihaela (Glen Cove, NY), Demir; Alpaslan (East Meadow, NY), Pan; Jung-Lin (Selden, NY), Sternberg; Gregory S. (Mt. Laurel, NJ), Yang; Rui (Greenlawn, NY), Li; Bin (Ronkonkoma, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/265,373
Filed: November 2, 2005

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Related U.S. Patent Documents

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Application Number Filing Date Patent Number Issue Date
60625188 Nov., 2004


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Current U.S. Class: 375/229 ; 327/311; 327/552; 327/553; 375/232
Current International Class: H03K 5/08 (20060101); H03K 5/159 (20060101); H04B 1/10 (20060101)