Patent ID: 8275053

Claim:
An apparatus for estimating a channel based on a channel delay spread, the apparatus comprising: a Fast Fourier Transform (FFT) converter for performing a Fourier transform on a signal where distortion has occurred; a channel estimating unit for estimating delay spread values, in a form of a sum between a channel value as a signal component and a white Gaussian noise as a noise component, on a basis of a plurality of channel estimation values corresponding to pilot signals only extracted from the signal on which the Fourier transform has been performed, for outputting a channel estimation value of an entire symbol for the signals where the distortion has occurred by using a column of the channel estimation values estimated for the pilot signals and Wiener Finite Impulse Response (FIR) filter coefficients that are calculated in advance to correspond to the estimated delay spread values, and for selecting the Wiener FIR filter coefficients from a predetermined plurality of Wiener FIR filter coefficients on a basis of a maximum of the estimated delay spread values; and a signal correcting unit for compensating for the distortion of the signal on a basis of the channel estimation value of the entire symbol, which is estimated for the signal where the distortion has occurred, and outputs the signals.