Patent ID: 8098747

Claim:
An OFDM (Orthogonal Frequency Division Multiplex) system comprising: a time-domain interference cancellation unit configured to cancel inter-carrier interference (ICI) between carriers of a received OFDM signal in a time domain based on an estimated symbol value output from a symbol estimation unit and an estimated time varying channel impulse response output from a time varying channel impulse response estimation unit; a Fourier transformer configured to Fourier-transform the interference-cancelled received OFDM signal and to output the Fourier-transformed signal as an input of the symbol estimation unit and as an input of the time varying channel impulse response estimation unit; and a frequency-domain equalizer configured to compensate for a channel influence in the received OFDM signal and to output the equalized Fourier-transformed signal to the symbol estimation unit, wherein the Fourier transformer is configured to output the Fourier-transformed signal to the equalizer; the symbol estimation unit including a first inverse Fourier transformer (IFFT) and configured to perform forward error correction on the equalized Fourier-transformed signal according to a forward error correction code and to estimate a symbol value of the received OFDM signal; and the time varying channel impulse response estimation unit including: a channel estimator configured to provide an estimated channel value signal from the Fourier-transformed signal; a second inverse Fourier transformer (IFFT) configured to provide a channel impulse response based on the channel value signal; and an interpolator configured to interpolate the channel impulse response to estimate the time varying channel impulse response, wherein a same estimated channel value signal from the Fourier-transformed signal is used both by the frequency-domain equalizer to compensate for the channel influence and by the second inverse Fourier transformer (IFFT) to provide the channel impulse response.