Patent ID: 7570626

Claim:
A transmission method for transmitting an orthogonal frequency division multiplexing signal, the method comprising: composing, a plurality of carrier groups each including one or more subcarriers; assigning, transmission data for a plurality of transmission destination terminals, to the plurality of carrier groups; selecting, for each of the carrier groups one of a first frame configuration where the transmission data is transmitted using one modulated signal, and a second frame configuration where the transmission data is transmitted using a plurality of modulated signals; and transmitting the assigned transmission data, the transmitting comprising transmitting, at a first unit of time, a modulated signal for a first terminal on a first carrier group and a modulated signal for a second terminal on a second carrier group, and transmitting, at a second unit of time, a modulated signal for a third terminal on the first carrier group and a modulated signal for a fourth terminal on the second carrier group.