Patent ID: 8687515

Claim:
A reception device for receiving a transmitted signal into which a pilot signal is inserted at fixed intervals or a frequency division multiplexed signal in which a pilot signal is transmitted on a particular subcarrier, in either case the pilot signal being a known signal at the reception device, and detecting a velocity of motion of the reception device from the transmitted signal, the reception device comprising: a Fourier transform section configured to store a channel characteristic obtained from the pilot signal for a prescribed number of symbols and to perform a Fourier transform; a power calculation section configured to calculate a power of each Doppler frequency component from an output of the Fourier transform section; a time-direction filtering section configured to filter an output of the power calculation section for each Doppler frequency component in the time direction; a noise masking section configured to mask a noise component included in an output of the time-direction filtering section; an edge enhancement weighting section configured to emphasize power changes between mutually adjacent Doppler frequency components in an output of the noise masking section; and an edge decision section configured to generate motion information from an output of the edge enhancement weighting section and a predetermined decision threshold.