Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2005-01-13
2008-09-30
Ha, Dac V (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S329000, C375S339000, C375S371000, C455S202000, C455S203000, C455S214000, C455S216000, C455S334000, C329S306000, C329S346000
Reexamination Certificate
active
07430247
ABSTRACT:
Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nthpower, transforming the raised signal to frequency domain data and determining an initial maximum frequency peak, iteratively fine shifting the frequency of the N-ary modulated signal around the initial maximum frequency peak and repeating the raising, transforming and determining steps to obtain a plurality of maximum frequency peaks, and calculating the carrier frequency from the maximum frequency peaks and the total related frequency shift.
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patent: 5598439 (1997-01-01), Wagner
patent: 6452376 (2002-09-01), Marguinaud et al.
patent: 6810097 (2004-10-01), Yamagata
patent: 7266162 (2007-09-01), Jiang
Gray Francis I.
Ha Dac V
Tektronix Inc.
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