Patent ID: 7869489

Claim:
An apparatus for acquiring a preamble in an orthogonal frequency division multiple access (OFDMA) mobile terminal, the apparatus comprising: a first pseudo-noise (PN) code generation unit to generate a first PN code comprising a bit string including at least one bit; a first correlation calculation unit to correlate a preamble signal with the first PN code within a first correlation range to generate a first correlation value; a first correlation value comparison unit to compare the first correlation value with a first threshold value and to determine whether to generate a second PN code; a second PN code generation unit to generate a second PN code comprising bit values of the first PN code in specific bits of the second PN code according to the determination result; a second correlation calculation unit to correlate the preamble signal with the second PN code within a second correlation range to generate a second correlation value; and a preamble acquisition determination unit to compare the second correlation value with a second threshold value and to determine whether to acquire the preamble.