Patent ID: 8451948
Filing Date: 2013-05-28
Classification: H04L

Abstract:
1. A carrier recovering apparatus comprising: a rotation calculator for multiplying a baseband signal and an oscillation signal and outputting a multiplied signal; a pilot signal extractor for extracting a pilot signal from the signal output from the rotation calculator; an error detection controller including an output signal selector and an error detector for outputting a phase error between the pilot signal and a reference signal; a loop filter for smoothing the phase error output from the error detection controller and outputting the smoothed phase error; and a variable frequency oscillator for generating a signal in accordance with the output of the loop filter and outputting the generated signal as the oscillation signal, wherein: the output signal selector selects the pilot signal in a case where a signal point determined by an in-phase signal component and a quadrature signal component of the pilot signal is within a given region on an in-phase signal-quadrature signal plane, and outputs a signal having a restricted value in a case where the signal point is out of the given region, and the error detector obtains a phase error between the signal obtained by the output signal selector and the reference signal, and outputs the obtained phase error.