The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 2007
Filed:
Aug. 31, 2001
Bernd Bienek, Bocholt, DE;
Andreas Falkenberg, Escondido, CA (US);
Stephan Karger, Hamminkeln, DE;
Theo Kreul, Coesfeld-Lette, DE;
Albrecht Kunz, Saarbrücken, DE;
Holger Landenberger, Bocholt, DE;
Bernd Bienek, Bocholt, DE;
Andreas Falkenberg, Escondido, CA (US);
Stephan Karger, Hamminkeln, DE;
Theo Kreul, Coesfeld-Lette, DE;
Albrecht Kunz, Saarbrücken, DE;
Holger Landenberger, Bocholt, DE;
Siemens Aktiengesellschaft, Munich, DE;
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.