Patent ID: 8059611

Claim:
A base station apparatus that performs communication with a user apparatus using orthogonal frequency division multiplexing (OFDM) in a downlink, comprising: a generation unit configured to perform inverse Fourier transform on a signal to which a first signal and a second signal are mapped so as to generate a transmission signal; and a transmission unit configured to transmit the transmission signal to the user apparatus, wherein, when the number of transmission antennas of the base station apparatus is two, mapping of the second signal to a subcarrier to which the first signal is to be mapped in a first transmission antenna is prohibited in a second transmission antenna, and wherein, even when the number of transmission antenna of the base station apparatus is one, a particular subcarrier in which mapping of the second signal is prohibited is determined by assuming that the number of transmission antennas of the base station apparatus is two such that the particular subcarrier becomes the same as the subcarrier in which mapping of the second signal is prohibited in the second transmission antenna which is used when the number of transmission antennas of the base station apparatus is two.