Patent ID: 7342974

Claim:
A method for processing a RF OFDM signal transmitted from an OFDM transmitter, comprising: receiving and converting the RF OFDM signal into an IF OFDM signal; converting the IF OFDM signal into a digital OFDM signal; mixing down and synchronizing the digital OFDM signal to a baseband OFDM signal; removing cyclic prefix in the baseband OFDM signal; implementing FFT of the baseband OFDM signal wherein the cyclic prefix is removed; estimating channels of and equalizing the OFDM signal after FFT, which further comprises: deriving responses of pilot channels; deriving responses of first data channels by time and frequency domain combined linear interpolation among the responses of the pilot channels; deriving each response of boundary channels by frequency domain linear interpolation between the responses of the nearest pilot and first data channels; deriving responses of second data channels by frequency domain extrapolation using the responses of the pilot and first data channels; and equalizing sub-carriers by the responses of all the channels; applying channel decoding to the equalized OFDM signal; and removing energy dispersal from the OFDM signal after the channel decoding.