Comparison between known adaptive algorithms for Pre-FFT beamforming in OFDMA systems

This paper presents a study of applicability on using smart array systems on a generic multiuser OFDMA system. In this research, three well-known adaptive algorithms such as LMS, SMI and RLS are employed in Pre-FFT scheme, and their performances are evaluated in terms of speed of convergence, beamforming and null steering capabilities, and analysis of BER over a multipath fading channel. Good results on multiuser recovering by using spectral and spatial multiplexing demonstrate the reliability on combining OFDMA and adaptive arrays as a way to enhance the system capacity.