Patent ID: 8718162

Claim:
A reception device configured to demodulate information from a reception signal, the reception device comprising: a channel estimator configured to estimate a plurality of channel impulse responses at a plurality of times in an orthogonal frequency division multiplexing (OFDM) symbol; a symbol replica generator configured to generate a symbol replica that is a modulation symbol of the information demodulated; a signal extractor configured to extract, in a plurality of frequency domains obtained from a plurality of time durations, each of subcarrier elements of the reception signal from which an inter-carrier interference is cancelled, based on the channel impulse responses and the symbol replica; and a demodulator configured to demodulate signals on the subcarrier elements in the plurality of frequency domains, which are extracted by the signal extractor, wherein the signal extractor is configured to estimate a plurality of frequency responses based on the plurality of channel impulse responses at the plurality of times, and the signal extractor comprises: a filter unit configured to generate a reception signal replica that is a replica of the reception signal in a time domain, based on the plurality of channel impulse responses at the plurality of times and the symbol replica; a subtractor configured to subtract the reception signal replica from the reception signal; a plurality of duration extractors configured to extract signals in the plurality of time durations from a signal generated from subtraction by the subtractor; a time-to-frequency converter configured to convert, into frequency domain signals, each of the signals in the plurality of time durations, which are extracted by the plurality of duration extractors; and a plurality of reconstructors configured to generate a plurality of replica signals of a desired signal based on the plurality of frequency responses and the symbol replica, add the plurality of replica signals of the desired signal to the frequency domain signals generated from conversion by the time-to-frequency converter, and extract, in the plurality of time durations, each of subcarrier elements of the reception signal.