Patent ID: 6018551
Filing Date: 2000-01-25
Classification: H04L

Abstract:
A carrier reproducing device for reproducing, from an input signal whose carrier is phase-modulated, the carrier, said device comprising:converting means for converting the input signal into a complex base band signal;a complex multiplier for complex-multiplying the complex base band signal by a local oscillation signal, to rotate the phase of the complex base band signal;phase difference detecting means for detecting the phase difference between the input signal and the local oscillation signal upon input of an output signal of said complex multiplier;local oscillation means for outputting the local oscillation signal whose frequency is controlled depending on the phase difference detected by said phase difference detecting means;region judging means for judging which of regions previously obtained by division on a complex plane is one to which the complex base band signal belongs;most frequent region judging means for judging which of the regions on the complex plan is one in which the complex base band signal is concentrated most frequently upon input of an output of said region judging means; andinitial phase setting means for setting an initial value of the phase of the local oscillation signal on the basis of an output of said most frequent region judging means.