Patent ID: 8457582

Claim:
An adaptive control apparatus including a signal control circuit for performing adaptive control using weighting coefficients for a plurality of radio signals respectively received through a plurality of antennas, and a demodulator for demodulating the adaptively controlled radio signals into demodulated data, the adaptive control apparatus comprising: a first computation unit for computing the weighting coefficients using a first adaptive control method in a first computation amount, the first adaptive control method having a first convergence rate and a first convergence error; a second computation unit for computing the weighting coefficients from initial values of the weighting coefficients computed by the first computation unit, using a second adaptive control method in a second computation amount, and for setting the computed weighting coefficients to the signal control circuit, the second adaptive control method having a second convergence rate slower than the first convergence rate and a second convergence error smaller than the first convergence error; a first measuring unit for storing the received radio signals during a certain period of time, and detecting a cycle of changes in the stored radio signals, and a controller for controlling determination of a ratio of the first computation amount to the second computation amount based on a moving speed of the adaptive control apparatus, controlling the first and second computation unit to perform computing processes at the determined ratio, and computing the moving speed of the adaptive control apparatus based on the detected cycle of changes in the stored radio signals.