Abstract: A new carrier frequency offset estimation scheme in orthogonal frequency division multiplexing(OFDM)system is proposed.The carrier frequency offset estimation includes acquisition and tracking,and acquisition as well as timing synchronization can be performed simultaneously with high accuracy.The maximum acquisition range can be up to one half of overall signal bandwidth.The proposed tracking estimator is a maximum-likelihood estimator,and in AWGN channel,about 7.27dB improvement is obtained compared to the Schmidl's algorithm when N=128; in multipath channel,the proposed algorithm works well at moderate SNR.

Key words: frequency offset estimation, multipath channel, orthogonal frequency division multiplering