CCI suppression and channel equalization in pilot-assisted OFDM systems by space-time beamforming

Two conventional methods for suppression of co-channel interferences (CCI) in OFDM systems are pre-FFT and post-FFT beamforming schemes. Performance of each of these schemes depends on the parameters of the system and conditions of the environment; one scheme could produce much better result than another in a different condition. This makes choosing the appropriate scheme difficult in advance. In this article, a pilot-based space-time beamforming scheme is presented which shows better results than each individual scheme in every condition while its computational complexity is still much less than its post-FFT counterpart.