Communication apparatus and reception method
AssigneeMitsubishi Electric Corporation
InventorYohei Nishi
Life of this patent
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Abstract
In a communication apparatus for receiving signals of frequency channels, a synchronization determiner determines whether synchronization of a demodulated signal is established. A BER calculator calculates a pseudo BER of the demodulated signal with the synchronization established. A comparator detects a frequency channel having the lowest pseudo BER, that is, the best value of the evaluation scale defined for transmission quality. A correction value calculator calculates a correction value for a symbol clock frequency in each frequency channel, based on a symbol clock frequency deviation in the frequency channel having the best value of the evaluation scale.
Claims12
A communication apparatus for receiving signals of a plurality of frequency channels, comprising:
- an oscillator to output a reference signal having a frequency corresponding to each of the frequency channels;
- a demodulator to demodulate a signal received in each of the frequency channels and to generate a demodulated signal;
- a deviation calculator to calculate a frequency deviation that is a difference in frequency between the demodulated signal and the reference signal in each of the frequency channels;
- a quality calculator to calculate transmission quality of each of the frequency channels;
- and
- a correction value calculator to calculate, based on the frequency deviation in a frequency channel determined according to the transmission quality calculated by the quality calculator, a correction value for the frequency of the reference signal in each of the frequency channels,
- wherein the oscillator corrects, based on the correction value, the frequency of the reference signal, and outputs the reference signal having the corrected frequency.
A reception method performed by a communication apparatus for receiving signals of a plurality of frequency channels, the reception method comprising:
- oscillating to output a reference signal having a frequency corresponding to each of the frequency channels;
- demodulating a signal received in each of the frequency channels to generate a demodulated signal;
- calculating a frequency deviation that is a difference in frequency between the demodulated signal and the reference signal in each of the frequency channels;
- calculating transmission quality of each of the frequency channels;
- calculating, based on the frequency deviation in a frequency channel determined for the transmission quality calculated in the calculating of the transmission quality, a correction value for the frequency of the reference signal in each of the frequency channels;
- and
- correcting, based on the correction value, the frequency of the reference signal.
Dependencies are inferred from the claim text.