Abstract: A suggestion, based on wavelet transform, was proposed to estimate the frequency offset in the orthogonal frequency division multiplexing(OFDM) system. Compared with the existed methods, the new method of frequency offset estimation does not have to know the received averaging power of unsteady signals and to open the windows for varied time observation. Also, the new form of wavelet transform is adaptive and is able to track the swing of frequency offset. The simulation shows that it has higher precision. With the help of it, the estimation for frequency offset in the OFDM system could be done very well.

Key words: orthogonal frequency division multiplexing, frequency offset estima-tion, Doppler shift, wavelets transform