Adaptive array performance with focussing technique

Adaptive array systems used for the rejection of multipath fading and additive interference in wideband indoor wireless communications require the addition of some frequency compensation methods in order to achieve adequate performance. The use of a focussing approach has been proposed as an alternative to the spectral decomposition technique to reduce the amount of data to be processed. This approach requires a preliminary estimation of the directions of arrival (DOA) of the signals using a fast acquisition technique such as the FFT. If these angles are inappropriately selected, our results show that the adaptive system performance is degraded. The focussing technique is combined with the constant power algorithm (CPA) to adjust the adaptation weights. Simulation and experimental results which show the behavior of the proposed algorithm are given.