Patent ID: 8428182

Claim:
A multiple-input and multiple-output (MIMO) transmission apparatus comprising: (a) a modulation signal generating section that generates: (i) first OFDM modulation signal, in which a plurality of subcarriers include a subcarrier carrying a pilot symbol and a subcarrier carrying a data symbol, in both a first time period and a second time period; and (ii) a second OFDM modulation signal, in which the plurality of subcarriers include a subcarrier carrying a pilot symbol and a subcarrier carrying a data symbol in the first time period, while in the second time period an in-phase component and a quadrature-phase component of every subcarrier included in the plurality of subcarriers are zero; (b) a MIMO transmitting section that transmits the first OFDM modulation signal from a first antenna and transmits the second OFDM modulation signal from a second antenna, wherein data included in a data symbol allocated to a subcarrier of a first frequency at a first time in the first time period in the first OFDM modulation signal is different from data included in a data symbol allocated to the subcarrier of the first frequency at the first time in the first time period in the second OFDM modulation signal.