Patent ID: 7826577

Claim:
A method for frequency acquisition via 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, the method comprising the steps of: determining an inband power of a received carrier frequency via a power sensor by scanning a frequency band; performing coarse determination of a local power maximum of the inband power at a coarse carrier frequency, and thus of the received carrier frequency over the scanned frequency band; producing a presumed channel frequency at which the base station is transmitting based on the coarse carrier frequency and knowledge of the channel raster of the transmit frequencies of the base station, the presumed channel frequency being different than the coarse carrier frequency; and simultaneously performing fine determination of the received carrier frequency using a synchronization channel, the synchronization channel having a correlation peak at a frequency that is different than the presumed channel frequency and different than the coarse carrier frequency.