A method for transmitting preamble sequences from a transmitter in an orthogonal frequency division multiplexing, OFDM, communication system, the OFDM communication system comprising at least one transmitter using multiple transmit antennas and a receiver using at least one receive antenna, the method using multiple transmit antennas, the method comprising the steps of: segmenting a first base sequence with a first preset length N 1 into a number N pre1 of second sequences, each having a length of N 1 /N pre1 samples of the first base sequence; applying different time offsets to the second sequences by cyclic shifting the second sequences of the first base sequence by integer multiples of N 1 /N pre1 and thereby generating N pre1 subsequences of a first preamble sequence corresponding to the number N pre1; segmenting a second base sequence with a second preset length N 2 into a number N pre2 of third sequences, each having a length of N 2 /N pre2 samples of the second base sequence; applying different time offsets to the third sequences by cyclic shifting the third sequences of the second base sequence by integer multiples of N 2 /N pre2 and thereby generating N pre2 subsequences of a second preamble sequence corresponding to the number N pre2; selecting a specific subsequence from the N pre1 subsequences of the first preamble sequence and transmitting the specific subsequence through a specific transmit antenna of the multiple transmit antennas in a first preset time interval for acquiring synchronization; and selecting a first preset number N TX of subsequences from the N pre2 subsequences of the second preamble sequence, the first preset number corresponding to the number N TX of multiple transmit antennas, and mapping and transmitting the selected subsequences of the second preamble sequence through some or all of the multiple transmit antennas in a second preset time interval for identifying a transmitter; wherein the first preamble sequence is transmitted through a first transmit antenna and the second preamble sequence is transmitted through the first to N TX -th transmit antennas, and wherein the first preamble sequence is different from the second preamble sequence. segmenting a first base sequence with a first preset length N 1 into a number N pre1 of second sequences, each having a length of N 1 /N pre1 samples of the first base sequence; applying different time offsets to the second sequences by cyclic shifting the second sequences of the first base sequence by integer multiples of N 1 /N pre1 and thereby generating N pre1 subsequences of a first preamble sequence corresponding to the number N pre1; segmenting a second base sequence with a second preset length N 2 into a number N pre2 of third sequences, each having a length of N 2 /N pre2 samples of the second base sequence; applying different time offsets to the third sequences by cyclic shifting the third sequences of the second base sequence by integer multiples of N 2 /N pre2 and thereby generating N pre2 subsequences of a second preamble sequence corresponding to the number N pre2; selecting a specific subsequence from the N pre1 subsequences of the first preamble sequence and transmitting the specific subsequence through a specific transmit antenna of the multiple transmit antennas in a first preset time interval for acquiring synchronization; and selecting a first preset number N TX of subsequences from the N pre2 subsequences of the second preamble sequence, the first preset number corresponding to the number N TX of multiple transmit antennas, and mapping and transmitting the selected subsequences of the second preamble sequence through some or all of the multiple transmit antennas in a second preset time interval for identifying a transmitter; wherein the first preamble sequence is transmitted through a first transmit antenna and the second preamble sequence is transmitted through the first to N TX -th transmit antennas, and wherein the first preamble sequence is different from the second preamble sequence.