Transmission method and transmission apparatus

A transmission apparatus having multiple antennas comprising:

• a transmission and modulation scheme selection processor configured to select (i) a transmission scheme for transmitting a plurality of transmission signals from among a plurality of transmission schemes according to a number of a plurality of antennas used for a transmission, and (ii) a modulation scheme from among a plurality of modulation schemes according to the number of a plurality of antennas used for a transmission;
• a modulator configured to modulate the plurality of transmission signals using the selected modulation scheme and to output a plurality of modulated transmission signals;
• and
• a transmitter configured to transmit the plurality of modulated transmission signals using the plurality of antennas used for the transmission among the multiple antennas,
• wherein the transmission and modulation scheme selector processor is configured to:
• select, when the multiple antennas are used for the transmission, a modulating scheme in which a maximum value of a number of modulated M-ary index of the selected modulation scheme is smaller than a maximum value of a number of modulated M-ary index of the modulation scheme selected when less than the multiple antennas are used for the transmission, and
• select, when less than the multiple antennas are used for the transmission, a modulating scheme having a same maximum value of a number of modulated M-ary index for every selected transmission scheme.