Array antenna system and weighting control technique used in array antenna system

A weight controller for controlling a weighting coefficient for each of a plurality of antenna elements of an antenna array, the weight controller comprising:

• a channel impulse response estimation unit configured to estimate a channel impulse response for each of the antenna elements based on a linear combination of a first received signal acquired when a first set of weighting coefficients is set for the antenna elements and a second received signal acquired when a second set of weighting coefficients is set for the antenna elements;
• and
• an output unit configured to output a control signal for adjusting the weighting coefficient of each of the antenna elements based on the estimated channel impulse responses.

A weight controller for controlling a weighting coefficient for each of a plurality of antenna elements, comprising:

• channel impulse response estimation unit configured to estimate a channel impulse response for each of the antenna elements based on a linear combination of a first signal, which is obtained as a vector product of a first known signal and a first received signal weighted by a first set of weighting coefficients and subjected to signal synthesis, and a second signal, which is obtained as a vector product of a second known signal orthogonal to the first known signal and a second received signal weighted by a second set of weighting coefficient and subjected to signal synthesis;
• and
• an output unit configured to generate and output a control signal for adjusting the weighting coefficient of each of the antenna elements based on the estimated channel impulse responses.