Patent ID: 8345786

Claim:
A method for transmitting a preamble signal in a signal transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system using a Multiple Input Multiple Output (MIMO) scheme, the method comprising: if N T transmit antennas are in use by the signal transmission apparatus, transmitting a time-domain preamble signal via each of the N T transmit antennas for a corresponding time period during an OFDM symbol period, each corresponding time period corresponding to one of the N T transmit antennas and set prior to the corresponding time period, wherein transmitting the time-domain preamble signal comprises: if the time-domain preamble signal is transmitted via a first transmit antenna among the N T transmit antennas for the corresponding time period, transmitting a zero signal which has an input value of ‘0’ via the remaining transmit antennas except for the first antenna among the N T transmit antennas for the corresponding time period.