Transmission Efficient Channel Estimation for OFDM System Under Multi-path Fast Fading Channel
This paper considers the channel estimation method in the case of a high mobility communication in orthogonal frequency-division multiplexing (OFDM) systems. In this paper, several successive OFDM symbols experienced channel are treated as a window. The polynomial approximation of the channel parameters in the time domain is considered. We show that the low order polynomials are good enough to model the channel within a window. Hence the interpolation performing over a whole window profits pilot reduction. Moreover, the method has an advantage of computational complexity because of the low order polynomial approximation and without the requirement of inter-carrier interference mitigation. The method is derived with the least-square approach for polynomial interpolation of arbitrary order. Simulation results show that the proposed method is robust to high Doppler frequency and enhancing the transmission efficiency.
transmission efficiency channel estimation ofdm fast time-varying channel low computational complexity