Patent ID: 8208880

Claim:
A frequency control device comprising: a frequency synchronizer to transform a radio signal having a radio frequency to a baseband signal having a baseband frequency by multiplication of the radio signal by a local signal; a same signal correlator to obtain a first correlation value between a first signal included in a first period of a first transmission symbol in the baseband and a second signal included in a second period, the second signal being equivalent to the first signal, the second period being shifted from the first period by a effective symbol length corresponding to a unit length for orthogonal transform of a carrier wave included in the radio signal; a different symbol correlator to obtain a second correlation value between a third signal included in a third period of the first transmission symbol and a fourth signal included in a fourth period, the fourth period being shifted from the third period by integral multiple of the effective symbol length and included in a second transmission symbol different from the first transmission symbol; a frequency error estimator to estimate a frequency error added on the radio signal based on a phase rotation value of a difference value obtained by a subtraction of the second correlation value from the first correlation value; and a frequency corrector to correct the baseband signal to cancel the frequency error.