Patent ID: 8115521
Filing Date: 2012-02-14
Classification: H04L

Abstract:
1. A frequency error detecting circuit comprising: an oscillator configured to output a frequency-variable oscillation output; a frequency converting unit configured to frequency-convert a frequency of a received signal on the basis of the oscillation output and output the received signal; a time-to-frequency converting unit configured to convert the output of the frequency converting unit from a time domain signal into a frequency domain signal including plural frequency components; a frequency shift determining unit configured to determine, on the basis of an output of the time-to-frequency converting unit, presence or absence of a frequency shift between an output frequency of the frequency converting unit and a predetermined carrier frequency; and a control unit configured to repeat frequency conversion processing of the frequency converting unit and conversion processing of the time-to-frequency converting unit while controlling an oscillation frequency of the oscillator on the basis of a determination result of the frequency shift determining unit and cause the output frequency of the frequency converting unit to converge on a predetermined value to thereby detect a frequency error between the frequency of the received signal and the predetermined carrier frequency on the basis of the oscillation frequency of the oscillator.