Doppler diversity receiver for broadband wireless OFDM system under high-speed mobile environments

A novel, simplified time-domain Doppler diversity receiver for OFDM system is proposed. In high-speed railway applications, when the train moves at the speed of 250-500 km/h, the Doppler spread of channel is obvious. With the proposed Doppler diversity receiver, OFDM system performance can be better. And the amount of multiplications and additions of the proposed Doppler diversity receiver can also be reduced. Simulation results show that adequate equalization is necessary for OFDM system under high-speed mobile environments.