Patent ID: 8335270

Claim:
A channel estimation method of an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising: receiving signals sent by a sending apparatus; performing channel estimation in time dimension on the signals; obtaining pilot signals from an effective sub-carrier frequency band on bandwidth of an OFDM symbol obtained after the channel estimation; adding channel information of pilot points on frequency bands outside the effective sub-carrier frequency band on the bandwidth of the OFDM symbol according to the obtained pilot signals; performing Inverse Fast Fourier Transform (IFFT) on the obtained pilot signals and the added channel information of the pilot points; windowing a time-domain response obtained after the IFFT according to preset windowing information; zero-padding the windowed time-domain response according to a number of sub-carriers of the OFDM symbol; performing Fast Fourier Transform (FFT) on the zero-padded time-domain response; and obtaining a channel frequency response with a length being a number of effective sub-carriers in the effective sub-carrier frequency band from the channel frequency response obtained after the FFT.