| 摘要 |
PROBLEM TO BE SOLVED: To provide a frequency control method which corrects the frequency error of a received radio signal, even if an interference signal which interferes with the radio signal exists. SOLUTION: The frequency control device 1 includes a frequency synchronizer 11 to convert the radio signal to a baseband signal, a same signal correlator 12 to calculate a first correlation value between a signal included in a first time period of a first transmission symbol of the baseband signal and the signal included in the second time period which is shifted as long as an effective symbol length from the first time period, being identical with the signal included in a first time period, a different symbol correlator 13 to calculate a second correlation value between the signal included in a third time period of the first transmission symbol and the signal included in a fourth time period in a second transmission symbol, which is shifted as long as integral multiples of the effective symbol length from the third time period, a frequency error estimator 14 to estimate a frequency error of 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 15 to correct the baseband signal so as to cancel the frequency error. COPYRIGHT: (C)2011,JPO&INPIT
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