Transmission method, transmission apparatus and communication system

A radio communication system a comprising:

• a transmission apparatus provided with a plurality of antennas;and
• a reception apparatus that receives signals transmitted from the plurality of antennas of said transmission apparatus,
• said reception apparatus comprises:
• a channel fluctuation estimation section that estimates a channel fluctuation about signals transmitted from the plurality of antennas of the transmission apparatus;
• a transmission method requesting section that determines any one of a first transmission method of transmitting a plurality of signals including the same data from the plurality of antennas and a second transmission method of transmitting a plurality of signals including different data from the plurality of antennas based on the estimated channel fluctuation and requests the determined transmission method from said transmission apparatus;
• a modulation scheme requesting section that determines any one of a plurality of modulation schemes based on the estimated channel fluctuation and requests the determined modulation scheme from said transmission apparatus;
• and
• a control section that controls whether or not the processing requested by said transmission method requesting section and modulation scheme requesting section should be performed in accordance with the procedure for a communication with said transmission apparatus, and
• said transmission apparatus comprises:
• a generation section that generates a signal corresponding to the transmission method requested from said reception apparatus;
• and
• a transmission processing section that modulates a signal generated by said generation section according to the modulation scheme requested from said reception apparatus and transmits the modulated signal from the respective antennas.

A transmission apparatus comprising

• a plurality of transmission antennas;
• a transmission method determining section that determines any one of a first transmission method of transmitting a plurality of signals including the same data from the plurality of antennas and a second transmission method of transmitting a plurality of signals including different data from the plurality of antennas;
• a modulation scheme determining section that determines any one of a plurality of modulation schemes;
• a control section that controls whether determining processing by said transmission method determining section and modulation scheme determining section should be performed or not in accordance with the procedure for a communication with the other communication party;
• and
• a transmission processing section that transmits the signals to which said determined transmission method and modulation scheme are applied from said plurality of antennas.

A reception apparatus comprising:

• a transmission method determining section that determines any one of a first transmission method of transmitting a plurality of signals including the same data from a plurality of antennas and a second transmission method of transmitting a plurality of signals including different data from the plurality of antennas;
• a modulation scheme determining section that determines any one of a plurality of modulation schemes;
• a control section that controls whether the determining processing by said transmission method determining section and modulation scheme determining section should be performed or not in accordance with the procedure for a communication with the other communication party;
• and
• a requesting section that requests the determined transmission method and modulation scheme from the other communication party.