Patent ID: 7236547

Claim:
A start-up automatic frequency control (AFC) method used during an initial cell search (ICS) processing by a user equipment (UE) receiver, comprising: (a) receiving input which includes a sequence; (b) rotating a phase of a stored sequence by a given frequency amount in a positive direction to form a positive rotated phase of the stored sequence and in a negative direction to form a negative rotated phase of the stored sequence; (c) correlating the received sequence with the positive rotated phase of the stored sequence; and (d) correlating the received sequence with the negative rotated phase of the stored sequence; (e) combining the outputs of the correlating steps (c) and (d) to form a frequency control signal, and automatically adjusting the frequency of the UE receiver responsive to the frequency control signal; and repeating step (b)–(e) to process a primary synchronization code (PSC) on a primary synchronization code channel (PSCH) for synchronization channel (SCH) location determination every N frames where N is an integer and N≧1 during ICS.