Patent ID: 7986757

Claim:
An apparatus for acquiring initial synchronization of a terminal in a mobile communication system, the apparatus comprising: an auto-correlator that calculates one or more auto-correlation values of a preamble constituting a signal that is received; a peak value detecting unit that calculates averages of the calculated auto-correlation values according to samples and detects a peak value among the calculated averages according to the samples; a cell searching unit that performs a cell search on the basis of the detected peak value; a regularizing unit that searches a peak value from a result of the cell search and regularizes the peak value; and a reference value comparing unit that compares the regularized peak value with a predetermined reference value and checks synchronization of the received signal at least once, wherein the cell searching unit comprises a preamble generator that generates codes for all possible cases of a preamble signal, and performs the cell search using the detected peak value and a preamble code that is generated by the preamble generator.