A wideband beamformer with interference and noise suppression capabilities employing only spatial signal processing

Abstract

This paper presents an adaptive beamformer for smart antennas, which is able to steer its main beam and nulls in azimuth over a wide frequency band, without tape delay lines or frequency filters. This is achieved based on fully spatial signal processing techniques wherein a two-dimensional antenna array operates as a spatial filter, processing the received signals with only weighting schemes. Previous weighting schemes algorithms are not capable of working properly in a noisy environment. However, in this paper, a second order Kalman filter is employed to efficiently synthesize the radiation patterns in a noisy environment.