Robust Adaptive Beamforming Method in Impulsive Noise

A new adaptive beamforming method in impulsive noise modeled as Sαα-stable) processes is proposed.The method firstly defines fractional lower-order array response and then develops a fractional lower order minimum variance distortionless response(FrMVDR) beamformer,based on the conventional minimum variance distortionless response(MVDR) beamformer.It is shown theoretically that the fractional lower order array output power is bounded when the fractional lower order is less than half of the characteristic exponent of the noise.Computer simulations show that the FrMVDR beamformer has superior performance in both Gaussian and non-Gaussian impulsive noise environments in comparison with the MVDR and other related fractional lower order moment(FLOM) based beamformers.Hence the proposed beamformer is a robust one.