Patent ID: 8031813
Filing Date: 2011-10-04
Classification: H03D,H04L,H04N

Abstract:
1. A carrier recovery apparatus comprising: a complex multiplier for multiplying a digitalized passband signal by an oscillation frequency of an oscillator and outputting a recovered carrier wave of a baseband signal; a first band pilot signal and frequency/phase error detecting part for outputting a pilot signal component and a frequency/phase error component of a first bandwidth, the first bandwidth being a bandwidth of a low pass filter (LPF) for extracting a typical pilot signal contained in the baseband signal output from the complex multiplier; a second band pilot signal and frequency/phase error detecting part for outputting a pilot signal component and a frequency/phase error component of a second bandwidth among the baseband signals output from the complex multiplier, the second bandwidth being narrower than the first bandwidth; a comparing part for comparing the pilot signal components output from the first band pilot signal and frequency/phase error detecting part and the second band pilot signal and frequency/phase error detecting part, and outputting a first selection signal for selecting one of output results of the first band pilot signal and frequency/phase error detecting part and the second band pilot signal and frequency/phase detecting part; a selecting part for selecting one of the frequency/phase error components output from the first band pilot signal and frequency/phase error detecting part and the second band pilot signal and frequency/phase error detecting part, the selection based on the first selection signal; a loop filter for removing a radio frequency (RF) component contained in the selected frequency/phase error component; and the oscillator for changing the oscillation frequency according to the selected frequency/phase error component whose RF component is removed.