Patent ID: 7197066

Claim:
A Direct Sequence—Code Division Multiple Access (DS-CDMA) system including a plurality of base stations and a mobile station that performs a three-stage cell search process, each of the base stations comprising: a transmission unit using at least one carrier frequency for transmitting a perch channel signal that is required for performing the three-stage cell search process, in which the at least one carrier frequency is uniquely distinguishable from other carrier frequencies, and the mobile station comprising: a first search unit performing a first-stage search being a first stage of the three-stage cell search and representing a search of a plurality of carrier frequencies of the DS-CDMA system; and a controller selecting the highest strength or highest correlation value carrier frequency among the plurality of carrier frequencies based on a result of the first-stage search to set the selected carrier frequency as a specified carrier frequency and controlling a second-stage search being a second stage of the three-stage cell search and representing a search of said specified carrier frequency and controlling a third-stage search being a third stage of the three-stage cell search and representing a search of said specified carrier frequency.