Patent ID: 8588202

Claim:
A method for transmitting signals, the method comprising: transmitting signals including data and pilots through a subchannel in time-frequency space by a specific transmitting side, wherein a first signal transmission mode is used in a transmitting side having a mobile speed lower than a prescribed speed and a second signal transmission mode is used in a transmitting side having a mobile speed greater than the prescribed speed, and wherein, if the first signal transmission mode is applied to the specific transmitting side, the specific transmitting side transmits the signals by reducing the number of pilot transmissions per subchannel compared to when the second signal transmission mode is applied to the specific transmitting side, wherein the number of guard subcarriers is increased for reducing the number of pilot transmissions per subchannel by setting the number of subcarriers excluding a direct current subcarrier to integer multiple of subcarriers included in one bin, wherein the subchannel of the first signal transmission mode satisfies Ds=1×(Sb×B+Db×B), where Ds indicates the number of data subcarriers transmitted through one subchannel, I indicates an interval of an OFDM symbol, Sb indicates the total number of subcarriers per bin, Db indicates the number of data subcarriers included in a bin including pilots, and B indicates the number of bins in the same OFDM symbol area.