New GSC beamformer employing DOA estimation and null steering for linear array

In the Letter, a new linear array GSC beamforming structure employing DOA estimation and the null steering technique is presented. It has the advantages that the quiescent response of the beamformer can be closely maintained and that the adaptive dimension of the beamformer can be reduced to about half of that of the full processor. Theoretical justification of the proposed approach is given and the performance achievable is investigated via computer studies.