Abstract: A device of an example of the invention comprises a first section of which performs inverse fast Fourier transform for a channel estimation value obtained by channel estimation to obtain a channel impulse response, a second section which selects paths that belong to a group having a large element based on elements of paths for the channel impulse response, a third section which calculates autocorrelation values by time averaging for each of the paths selected by the second section, a fourth section which obtains an ensemble average value of the autocorrelation values by time averaging obtained by the third section, and a fifth section which obtains a Doppler frequency associated with the ensemble average value based on a characteristic of a relationship between an autocorrelation value and a Doppler frequency and the ensemble average value.

Abstract: A device of an example of the invention comprises a first section which performs IFFT for a channel estimation value obtained by channel estimation to obtain a channel impulse response, a second section which selects paths that belong to a group having a large element based on elements of paths for the channel impulse response, a third section which calculates autocorrelation values by time averaging for each of the paths selected by the second section, a fourth section which obtains an ensemble average value of the autocorrelation values by time averaging obtained by the third section, and a fifth section which obtains a Doppler frequency associated with the ensemble average value based on a characteristic of a relationship between an autocorrelation value and an Doppler frequency and the ensemble average value.