The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2002
Filed:
Jul. 22, 1999
Robert K. Schweickert, Jupiter, FL (US);
John Richard Oakley, Round Rock, TX (US);
Other;
Abstract
A symbol independent automatic frequency controller ( ) includes a symbol correlator ( ) for receiving a complex digital signal generated within a selective call receiver wherein the symbol correlator provides a real signal ( ), an imaginary signal ( ), and a magnitude signal ( ), a discriminator ( ) coupled to the symbol correlator for receiving and processing the real signal and the imaginary signal to provide a frequency error signal, a low pass filter ( ) and comparison element ( ) for filtering the magnitude signal and comparing the magnitude signal to a predetermined lock threshold signal that controls the bandwidth of the symbol correlator in the event the magnitude signal exceeds the lock threshold signal, and a feedback loop providing the imaginary signal ( ) to an accumulator ( ) and back to the symbol correlator wherein the accumulator provides the symbol correlator with an apriori-symbol phase feedback ( ).