| 摘要 |
A carrier phase follower is provided that can follow the carrier phase even when the carrier phase angle varies with respect to a reference frequency signal. Demodulation data is decided, without any carrier regeneration, based on the signal by obtained demodulating a digital-modulated signal with a reference frequency signal while following the carrier phase with respect to the reference frequency signal. The carrier phase follower includes the phase angle decision unit 13 which decides the shift of an offset phase angle as well as the digital filter 14 and the cumulative adder 12 which update a set offset phase angle based on the shift. Specifically, the phase angle decision unit 13 corrects the phase angle of a demodulated signal from the phase angle calculation unit 8 according to the set offset phase angle from the cumulative adder 12, with the decision timing synchronized with the symbol of the digital-modulated signal, to decide the shift of the offset phase angle.
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