United States Patent 7,502,406
Lomp , et al. March 10, 2009
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Automatic power control system for a code division multiple access (CDMA) communications system
Abstract
A receiver receives signals and noise over a frequency spectrum of a desired received signal. The desired received signal is spread using code division multiple access. The received signals and noise are demodulated to produce a demodulated signal. The demodulated signal is despread using a code uncorrelated with a code associated with the desired received signal. A power level of the despread demodulated signal is measured as an estimate of the noise level of the frequency spectrum.
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Inventors: Lomp; Gary (Centerport, NY), Ozluturk; Fatih (Port Washington, NY), Kowalski; John (Hempstead, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 10/084,007
Filed: February 27, 2002
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
09833285 Apr., 2001
09406162 Sep., 1999
08669770 Jun., 1996 5991329
60000775 Jun., 1995
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Current U.S. Class: 375/140 ; 370/332; 370/335; 370/441; 375/148; 375/150; 375/340; 455/13.4
Current International Class: H04L 27/00 (20060101)
Field of Search: 375/130,142,144,148,150,340,343 370/320,331,332,335,342,441,479 455/13.4,33.2,38.3
