Pulse or digital communications – Transmitters
Reexamination Certificate
2006-07-04
2006-07-04
Burd, Kevin (Department: 2631)
Pulse or digital communications
Transmitters
C375S130000, C375S135000, C375S146000
Reexamination Certificate
active
07072418
ABSTRACT:
A method and apparatus for re-modulating an RF carrier modulated signal using a Nyquist folding frequency modulation technique. The method modulates a digitized RF carrier modulated signal with a digital sequence of {1,−1,1,−1, . . . }, where the center frequency of the RF carrier modulated signal is at a first frequency and the sample rate of the modulating signal is at a second frequency. When the second frequency is four times the first frequency, the output of the digital modulation process is a spectrum-inverted copy of the source RF carrier modulated signal. For all other frequencies, the remodulated RF carrier modulated signal has a center frequency equal to the carrier frequency minus one-half the sample rate of the modulating signal. A spectrum inversion is then performed to recreate the spectrum of the source RF carrier modulated signal, which is now located at a different center frequency. The apparatus comprises a modulating signal source and a digital modulator. A resampler and a spectrum inverter may be used as needed.
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EPO Search Report Dated Nov. 17, 2004 Attached.
Aghdam Freshteh N
Burd Kevin
Eriksen Guy H.
Kurdyla Ronald H.
Laks Joseph J.
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