Patent ID: 7760618

Claim:
A method of transmitting orthogonal frequency division multiplexing (OFDM) signals wirelessly from a plurality of OFDM transmitters respectively each including a plurality of wireless transmitting units, comprising; allocating a first pilot signal and a first data signal which are both common among the OFDM transmitters respectively to at least one first pilot subcarrier and first data subcarriers within a specific time-frequency domain that is common among the OFDM transmitters and different among the wireless transmitting units; allocating a second pilot signal and a second data signal respectively to at least one second pilot subcarrier and second data subcarriers outside the time-frequency domain; multiplying the first pilot signal and the first data signal by a complex number set for the time-frequency domain; generating an OFDM signal by performing OFDM modulation on the first pilot signal and the first data signal multiplied by the complex number and the second pilot signal and the second data signal; and transmitting the OFDM signal.