Pre-FFT adaptive beamformer based on RLS for OFDM systems

In this paper, a pre-fast Fourier transformation (FFT) adaptive beamformer based on RLS is proposed for orthogonal frequency division multiplexing (OFDM) systems, using pilot symbols in the frequency domain. The simulation results show that the proposed beamformer has good convergence performance while reducing computational complexity, and can obtain robust BER performance due to tracking the variance of the channel by the pilot signal.