Doppler Compensation by Using Dual Antenna for Mobile OFDM Systems

The performance of OFDM systems is compromised in mobile environments due to Doppler spreading. In this paper, we investigate how Doppler spreading due to the mobility of the receiver can be mitigated by using dual antenna. In this context, we propose two simple antenna combining schemes, namely, simple beamforming (SB) and beamforming with frequency offset correction (BFOC), and investigate the ICI mitigating capability of these methods. We show that by using appropriate antenna spacing, beamforming coefficients and frequency offset correction, the performance of the OFDM systems can be greatly improved in high mobility scenarios.