Patent ID: 7411894

Claim:
A method for transmitting an Orthogonal Frequency Division Multiplexing (OFDM) symbol in an OFDM communication system, the OFDM symbol including a guard interval and a data interval, the method comprising the steps of: copying data at a predetermined interval in a data row inputted to be transmitted; filling the copied data and unique words in the guard interval and filling the data row in the data interval, the unique words having a constant amplitude and a non-periodic auto-correlation characteristic; and transmitting the OFDM symbol comprised of the guard interval and the data interval filled with the unique words and the data row; wherein the guard interval includes a first interval, a second interval, and a third interval, which are continuing in sequence, a portion of the copied data being filled in the first interval, the uniqiue words being filled in the second interval, a other portion of the copied data being filled in the third interval.