Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2006-12-26
2006-12-26
Eng, George (Department: 2617)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S196100, C455S427000
Reexamination Certificate
active
07155183
ABSTRACT:
A method and apparatus for using a conventional oscillator in a cellular telephone transceiver as a source of a reference signal for a GPS receiver. In one embodiment, the method comprises using a voltage-controlled oscillator (“VCXO”) within a cellular telephone transceiver to generate a reference frequency signal for the GPS receiver. Circuitry within the telephone transceiver generates a frequency error signal. Both of these signals are coupled to GPS circuitry and used to control a carrier numerically controlled oscillator (“NCO”) and a code NCO. The NCOs produce a tuning signal and a timing signal, respectively. The GPS circuitry uses the NCO generated signals to process GPS signals.
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Doan Phuoc
Eng George
Global Locate, Inc.
Moser IP Law Group
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