Telecommunications – Receiver or analog modulated signal frequency converter – Panoramic display
Reexamination Certificate
2007-10-30
2007-10-30
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Panoramic display
C375S343000
Reexamination Certificate
active
10381014
ABSTRACT:
A method is provided for calibrating the frequency of an RF oscillator in a mobile part of a mobile communications device when the mobile part is first switched on, wherein the method includes the steps of: sampling a modulated carrier that is transmitted by a base station and has a prescribed frequency accuracy, such that scanning of the modulated carrier is performed via a frequency search algorithm with the modulated carrier being demodulated, a signal thus demodulated being compared in an evaluation and synchronization program via a correlation with a sequence known in advance, and a correlation peak in an output of the correlator being determined; determining a frequency error between the frequency of the RF oscillator in the mobile part of the mobile communications device and a known channel frequency of the base station by comparing the determined correlation peak of the output of the correlator with a channel raster, known in advance to the mobile communications device, of the base station; synchronizing the mobile communications device with the modulated carrier; and adopting a frequency, corrected by the frequency error, for the RF oscillator as reference frequency for further calibration operations.
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Bienek Bernd
Falkenberg Andreas
Karger Stephan
Kreul Theo
Kunz Albrecht
Bell Boyd & Lloyd LLP
Nguyen Tu X.
Siemens Aktiengesellschaft
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