Patent ID: 7545791

Claim:
A wireless transmission apparatus comprising: at least one transmission antenna; a transmission section that transmits a preamble signal and a data signal via the at least one transmission antenna; and a detection section that detects an idle signature subcarrier out of a plurality of signature subcarriers that are used to transmit a signature signal and have frequencies different from a data subcarrier, wherein: the transmission section uses a preamble subcarrier allocated per transmission antenna to transmit the preamble signal and uses the data subcarrier having a frequency different from each preamble subcarrier to transmit the data signal, when transmitting the data signal, the transmission section transmits the signature signal using the detected idle signature subcarrier, and the number of the plurality of signature subcarriers corresponds to the total number of transmission antennas that can transmit the data signal in parallel to a wireless reception apparatus to which the data signal is addressed.