Patent ID: 8077598

Claim:
A radio transmission apparatus comprising: a modulator configured to: modulate first data using a first modulation scheme to obtain first modulated data, the first modulation scheme being selected from a first plurality of modulation schemes, and modulate second data using a second modulation scheme to obtain second modulated data, the second modulation scheme being selected from a second plurality of modulation schemes and the second plurality of modulation schemes including an M-ary number different from an M-ary number of the first plurality of modulation schemes; and a mapping unit configured to: map the first modulated data on a first region including a plurality of subcarriers along one of a frequency axis and a time axis, the first region being defined by the frequency axis and the time axis, and map the second modulated data on a second region including a plurality of subcarriers along the other of the frequency axis and the time axis, the second region being defined by the frequency axis and the time axis and different from the first region.