Radio device

A radio apparatus (2000) varying antenna directivity in real time, and transmitting and receiving signals to and from a plurality of terminals, comprising:

• a plurality of antennas (#1 to #4) arranged in a discrete manner;
• a first reception circuit (SR1) receiving signals from said plurality of antennas, and separating a signal from a first terminal among the signals from said plurality of terminals;
• and
• a second reception circuit (SR2) receiving signals from said plurality of antennas, and separating a signal from a second terminal among the signals from said plurality of terminals;
• wherein
• said first reception circuit includes
• a first reception signal separation circuit (20.1) generating a first weight vector based on the signals from said plurality of antennas and separating the signal from said first terminal in receiving a reception signal,
• a first reception correlation vector calculation circuit (22.1) calculating, in receiving said reception signal, a first reception correlation vector with respect to the signal from said first terminal, in accordance with a first replica signal, generated based on an output of said first reception signal separation circuit, and the signals from said plurality of antennas,
• a first replica signal generating circuit (40.1) generating a second replica signal corresponding to the signal from said second terminal, based on separation control information in said second reception circuit, with respect to the signals from said plurality of antennas in receiving said reception signal, and
• a reception response vector calculation circuit (24.1) estimating a reception response vector with respect to the signal from said first terminal, based on a second reception correlation vector with respect to the signal from said second terminal provided from said second reception circuit, said first reception correlation vector, and a correlation matrix calculated from said first and second replica signals.