Transmission device, reception device, and radio communication method

A transmission method comprising:

• generating a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being arranged at a first position in an in-phase quadrature-phase plane;
• generating a second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the second modulated information signal is arranged to a third position in the in-phase quadrature phase plane, wherein the third position is different from the first position, and
• generating an OFDM modulation signal including the first modulation symbol and the second modulation symbol,
• wherein the OFDM modulation signal comprises a plurality of subcarriers′, and
• transmitting the OFDM modulation signal.

A reception apparatus comprising:

• a receptor that receives an OFDM modulation signal to which a first modulation symbol and a second modulation symbol are multiplexed, wherein
• the OFDM modulation signal comprises a plurality of subcarriers,
• the plurality of subcarriers include
• the first modulation symbol arranged in a first position in an in-phase quadrature-phase plane, and
• the second modulation symbol arranged in a third position in the in-phase quadrature-phase plane,
• the first modulation symbol is a symbol to which a first information signal is modulated using a first modulation scheme,
• the second modulation symbol is a symbol obtained by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the second modulated information signal is arranged to the third position in the in-phase quadrature-phase plane;
• and
• a demodulator that separates the first modulation symbol and the second modulation symbol included in the OFDM signal, demodulates the first information signal from the first modulation symbol, and demodulates the second information signal from the second modulation symbol.

A reception method comprising:

• receiving an OFDM modulation signal to which a first modulation symbol and a second modulation symbol are multiplexed, wherein
• the OFDM modulation signal comprises a plurality of subcarriers,
• the plurality of subcarriers include
• the first modulation symbol arranged in a first position in an in-phase quadrature-phase plane, and
• the second modulation symbol arranged in a third position in the in-phase quadrature-phase plane,
• the first modulation symbol is a symbol to which a first information signal is modulated using a first modulation scheme,
• the second modulation symbol is a symbol obtained by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the second modulated information signal is arranged to the third position in the in-phase quadrature-phase plane;
• separating the first modulation symbol and the second modulation symbol included in the OFDM signal′,
• demodulating the first information signal from the first modulation symbol′, and
• demodulating the second information signal from the second modulation symbol.