A Channel Tracing and Equalization Technique for Mobile OFDM Systems

For mobile communications, time variation of the channel during one OFDM frame introduces intercarrier interference (ICI). Conventional pilot-aided technique can improve the system bit error rate (BER) performance efficiently sacrificing efficient bandwidth. Some others proposed blind or semi-blind method for the channel estimation utilizes certain underlying statistical properties of the transmitted data make systems becomes complexity. In this paper, effective channel estimation and tracking method based on an iterative equalizer technique (IET) is proposed, which not only can significantly mitigate the ICI and improve the BER performance but also can upgrade the system transmission efficiency, with practicability. The numerical simulations show that the ADFE method can approach same performance as the known channel results, conditionally