Patent ID: 7826555

Claim:
A MIMO-OFDM transmission apparatus that transmits OFDM-modulated data symbols from a plurality of antennas in a data transmission period and transmits pilot symbols from specific carriers of the plurality of antennas in the data transmission period, the apparatus comprising: an OFDM signal forming section that forms OFDM signals to be transmitted from the plurality of antennas; and a pilot symbol mapping section that assigns orthogonal sequences to same carriers of the OFDM signals of a same time period, and forms pilot carriers, wherein: when the OFDM signals are transmitted from two antennas, the pilot symbol mapping section forms the pilot carriers such that; pilot signals of orthogonal sequences are used for same pilot carriers between a first antenna and a second antenna; pilot signals of different sequences are used for different pilot carriers at each of the first antenna and the second antenna; and pilot signals of a same sequence are used at the first antenna and the second antenna.