Patent ID: 7187732
Filing Date: 2007-03-06
Classification: H03J,H04B,H04J,H04L

Abstract:
1. Apparatus for performing start-up automatic frequency control (AFC) during initial cell search (ICS) by a user equipment (UE) receiver, where the ICS comprises: a processor configured to process a received synchronization code sequence to provide a peak location of the received synchronization code sequence; a first correlator for determining a correlation between the received synchronization code sequence and a sequence generated by the apparatus; a second correlator for determining a correlation between the synchronization code sequence and a sequence equivalent to the generated sequence which has been altered in phase; an error estimator for determining the error associated with the outputs of the first and second correlators; said error estimator including: a filter for selectively integrating the error estimate responsive to an initial or steady state conditions of the cell search process; and an oscillator configured to produce an adjusted frequency responsive to the integrated error estimate.