United States Patent 7,532,667
Pan , et al. May 12, 2009
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Pilot-directed and pilot/data-directed equalizers
Abstract
A normalized least means square (NLMS) equalizer including two equalizer filters is disclosed. In one embodiment, a single correction term generator is used to generate correction terms for tap coefficient updates of each of the equalizer filters based on a pilot signal. In another embodiment, two different correction term generators are used to generate correction terms for each of the equalizer filters, whereby one of the correction term generators uses data received from a hard decision unit at the output of one of the equalizer filters to generate correction terms for both of the equalizer filters.
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Inventors: Pan; Jung-Lin (Selden, NY), Beluri; Mihaela C. (Glen Cove, NY), Pietraski; Philip J. (Huntington Station, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/256,047
Filed: October 21, 2005
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60625630 Nov., 2004
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Current U.S. Class: 375/229 ; 370/335; 370/503; 375/148; 375/222; 375/232; 375/235; 375/316; 375/344; 375/355
Current International Class: H03H 7/30 (20060101)
Field of Search: 375/229,232,344,148,222,324,355,316,235 370/335,503
