Patent ID: 7412013
Filing Date: 2008-08-12
Classification: H03J,H04B,H04J,H04L

Abstract:
1. A start-up automatic frequency control method used during initial cell search processing by a receiver, where the initial cell search processing includes processing of a received sequence to facilitate the determination of a frequency location of a received signal, the method comprising: rotating a phase of a stored sequence at a given frequency in a positive direction to produce a positively rotated phase of the stored sequence and in a negative direction to produce a negatively rotated phase of the stored sequence; correlating said received sequence with the positively rotated phase of the stored sequence to produce a positive phase correlation; correlating said received sequence with the negatively rotated phase of the stored sequence to produce a negative phase correlation; combining the positive and negative phase correlations to provide a frequency estimate; and filtering at least one frequency estimate to control the generation of a frequency by an oscillator.