Matrix Channel Estimation for OFDM Systems with Two Training Symbols and High-Order Polynomial Fitting

A time-varying channel estimation method for orthogonal frequency division multiplexing (OFDM) systems is presented. The presented method makes use of two training symbol scheme in combination with high-order polynomial fitting, and can thus obtain precious estimation results even under very large normalized Doppler frequency. Simulation results show that the presented method with second order of polynomial can work well at a normalized Doppler frequency as large as 0.08.