Method and apparatus for channel estimation for ofdm based communication systems

The present invention relates to channel estimation in an OFDM communication system, the method comprising: performing a FFT operation on a received OFDM signal, estimating a preliminary to the channel LS technique by using a pilot symbol with respect to result of the FFT calculation step the method comprising, the steps to obtain the estimated value of the preliminary channel estimates CIR (channel Impulse Response) by performing an IFFT operation on the result, and multiplying the predetermined amplitude adjustment coefficient of the estimated value, and the result of the multiplication step comparing a predetermined threshold value, OFDM communications system including the steps of improving the accuracy of the CIR estimate by the comparing step and the multiplication steps, the step of converting the improved CIR estimate by the channel estimation value by the FFT operation a channel estimation method, and provides a channel estimator implement them. OFDM, channel estimation, pilot symbols, STO, CIR