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With the development of high speed trains (HST) in many countries, providingbroadband wireless services in HSTs is becoming crucial. Orthogonalfrequency-division multiplexing (OFDM) has been widely adopted for broadbandwireless communications due to its high spectral efficiency. However, OFDM issensitive to the time selectivity caused by high-mobility channels, which costslarge spectrum or time resources to obtain the accurate channel stateinformation (CSI). Therefore, the channel estimation in high-mobility OFDMsystems has been a long-standing challenge. In this paper, we first propose anew position-based high-mobility channel model,in which the HST's positioninformation and Doppler shift are utilized to determine the positions of thedominant channel coefficients. %In this way, we can reduce the estimationcomplexity and to design the transmitted pilot.Then, we propose a joint pilotplacement and pilot symbol design algorithm for compressed channel estimation.It aims to reduce the coherence between the pilot signal and the proposedchannel model, and hence can improve the channel estimation accuracy.Simulation results demonstrate that the proposed method achieves betterperformances than existing channel estimation methods over high-mobilitychannels. Furthermore, we give an example of the designed pilot codebook toshow the practical applicability of the proposed scheme.

Position Based Compressed Channel Estimation and Pilot Design for High Mobility OFDM Systems