Patent ID: 6597725
Filing Date: 2003-07-22
Classification: H04B

Abstract:
A carrier phase follower wherein a digital-modulated signal is demodulated with a reference frequency signal and wherein demodulation data is decided based on the demodulated signal while following the carrier phase, comprising:symbol synchronization means for providing a decision timing in synchronization with a symbol of said digital-modulated signal; means for deciding a shift of an offset phase angle based on the phase angle of said demodulated signal and on said offset phase angle, with said decision timing; and offset phase angle setting means for updating said offset phase angle based on said shift, wherein said offset phase angle setting means comprises memory means for storing said offset phase angle, and wherein said shift is added to said offset phase angle stored into said memory means through a filter to produce an added value, and the added value is re-stored into said memory means.