METHOD FOR CALIBRATING THE FREQUENCY OF AN HF-OSCILLATOR IN A MOBILE PART OF A MOBILE COMMUNICATIONS DEVICE

METHOD FOR CALIBRATING THE FREQUENCY OF AN HF-OSCILLATOR IN A MOBILE PART OF A MOBILE COMMUNICATIONS DEVICE

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 frequ...

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Hauptverfasser: KUNZ, ALBRECHT, KREUL, THEO, KARGER, STEPHAN, BIENEK, BERND, FALKENBERG, ANDREAS, LANDENBERGER, HOLGER
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION
TUNING RESONANT CIRCUITS
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creator KUNZ, ALBRECHT
KREUL, THEO
KARGER, STEPHAN
BIENEK, BERND
FALKENBERG, ANDREAS
LANDENBERGER, HOLGER
description 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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subjects BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION
TUNING RESONANT CIRCUITS
title METHOD FOR CALIBRATING THE FREQUENCY OF AN HF-OSCILLATOR IN A MOBILE PART OF A MOBILE COMMUNICATIONS DEVICE
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