Doppler diversity technique based on pilot-aided channel estimation for OFDM wireless mobile communication

In the previous works on the traditional Doppler diversity algorithms, it is always assumed that the channel state information is perfect known at the receiver. However, this is not the case in real world. Hence, a novel Doppler diversity technique based on pilot-aided channel estimation for OFDM systems is studied in this paper. The performance of the proposed algorithm decreases if the value of normalized frequency shift is fixed as that in the traditional algorithm. But for the changeable value of normalized frequency shift, the performance is increased. Hence a method how to choose the optimum normalized Frequency shift based on pilot-aided channel estimation is researched in this paper. Finally, the simulation is evaluated to verify the analysis results.