LMS Beamforming Using Pre and Post-FFT Processing for OFDM Communication Systems

The adaptive array antenna is combined with OFDM "orthogonal frequency division multiplexing" as multicarrier technique to combat the flat and frequency selective fading effects at high speed wireless communication. In this paper an optimum weight sets beat informer at time and frequency domain were obtained based on LMS algorithm. Different aspects of these systems were investigated such as different values of delay spread, angle of arrival of interfering sources and number of array elements.