Timing-variant channel analysis and estimation for OFDM systems

In this paper, we propose the channel analysis for OFDM systems with Doppler Effect. The proposed analytic method based on Discrete Fourier Transform (DFT) to discuss the variation of channel frequency response in one subcarrier for different OFDM symbol. To verify our analysis, the Digital Video Broadcasting-Terrestrial (DVB-T) is taken as an example, and the effect of Doppler frequency shift on the well-known 2-D channel estimation for 2K Mode or 8K Mode of DVB-T receivers will be discussed.