Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-10-10
2006-10-10
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S152000
Reexamination Certificate
active
07120191
ABSTRACT:
A method and corresponding apparatus for accurately determining the offset of the carrier frequency of a received signal from a nominal frequency (the offset due to for example Doppler shifting), such as is done in a ranging receiver when acquiring or tracking a signal transmitted by a beacon (such as a satellite) of a positioning system. The method amplifies a conventional correlation by performing a special noncoherent integration of the real and imaginary components of the output of a conventional (coherent) correlation calculation, resulting in a complex phasor having a phase that bears information about the offset of the carrier frequency from the nominal carrier frequency.
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Fan Chieh M.
Nokia Corporation
Perilla Jason M.
Ware Fressola Van Der Sluys & Adolphson LLP
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