Patent ID: 7027464

Claim:
A method for transmitting an OFDM signal from a transmission side to a reception side, wherein the OFDM signal comprises at least one data symbol having only a plurality of subcarriers having data therein, and at least one pilot symbol including a plurality of subcarriers, at least one of the subcarriers having a frequency component predetermined in amplitude and phase, said method comprising: inserting, on the transmission side, the pilot symbol before or after one or more data symbols, and transmitting the pilot symbol together with one or more data symbols; and utilizing, on the reception side, the received pilot symbol for compensating for a frequency response variation of a transmission path resulted from at least one of distortion in the transmission path, out-of-synchronization with passage of time, frequency drift, and residual phase error, wherein the frequency response variation of the transmission path is compensated for by using a compensation vector calculated, as a time series linear approximation, from a difference in frequency response between any two pilot symbols closest to each other.