Patent ID: 7286591

Claim:
A synchronizing position detecting circuit for use in a receiver at a mobile station in a mobile communication system, comprising: a window size determining circuit which calculates a moved distance in which the mobile station has moved from a first location to a second location during a sleep time based on a moving speed of the mobile station and a duration of the sleep time, the window size determining circuit selecting a window size corresponding to the moved distance for ascertaining a phase change of a received signal that includes a code; a synchronizing code generating circuit which repeatedly generates a synchronizing code with at least part of the code of the received signal, the synchronizing code generating circuit successively shifting a phase of the synchronizing code by a predetermined phase width so as to provide a plurality of candidate signals with phases lying within the window; a correlation circuit for calculating a correlation function between the candidate signals and the received signal; and a synchronizing position determining circuit that determines which candidate signal has a maximum correlation value with the received signal.