This paper proposes an adaptive equalization technique for OFDM (Orthogonal Frequency Division Multiplexing) demodulation. This technique estimates a channel response with using pilot signals embedded in OFDM symbols. A two dimensional filter used for interpolating the response estimates the channel response accurately, and also improves the C/N by reducing noise bandwidth. The bit error rate performance of the system in various channels is calculated by computer simulation, and the relative C/N improvement to differential demodulation is about 2.5 dB. And the result shows that the optimum filter can be determined by the maximum path delay time and the maximum doppler frequency of the channel.
