Patent ID: 6850507

Claim:
A PN (Pseudo Noise) sequence acquisition device in a multicarrier CDMA (Code Division Multiple Access) mobile communication system, the device comprising: M (where M is a natural number) despreaders, each for multiplying base station (BS) generated PN sequences, included in a corresponding one of M carrier receiving signals, by a local PN sequence in a predetermined integrating period; M correlators, each corresponding to a corresponding one of the M despreaders, and each for calculating detection energies depending on correlations between the BS generated PN sequences included in the corresponding one of M carrier receiving signals and the local PN sequence; a combiner for combining the detection energies corresponding to a local PN sequence for the M carrier receiving signals; a controller for comparing the combined detection energy of the M carrier receiving signals, output from the combiner, with a threshold value; and a local PN generator for providing the local PN sequence to the M despreaders and for shifting a phase of the local PN sequence under the control of the controller.