Patent Number: 7,826,577

Title: Method for frequency acquisition of a mobile communications device

Abstract: A method is provided for frequency acquisition, particularly for initial frequency acquisition, pursuant to a known synchronization sequence for synchronizing a mobile communications device having a local oscillator with previously known transmit frequencies of a base station that transmit in a known channel raster with defined frequency points within a band, wherein the method includes the steps of determining the inband power of the known synchronization sequence via a sensor by scanning a frequency band, performing coarse determination of the local power maximum of the inband power and, thus, of the received carrier frequency over the scanned frequency band, producing a presumed channel frequency at which the base station is transmitting on the basis of knowledge of the channel raster of the transmit frequencies of the base station, performing fine determination of the received carrier frequency by comparison with the known synchronization sequence, and correcting the frequency deviation of the local oscillator from the transmitted carrier frequency.

Inventors: Bienek; Bernd (Bocholt, DE), Falkenberg; Andreas (Escondido, CA), Karger; Stephan (Hamminkeln, DE), Kreul; Theo (Coesfeld-Lette, DE), Kunz; Albrecht (Saarbrucken, DE), Landenberger; Holger (Bocholt, DE)

Assignee: Palm, Inc.

International Classification: H04L 7/00 (20060101)

Expiration Date: 2019-11-02 0:00:00