New Beamformer for Coherent Signal Reception

In this paper, a new three-stage beamformer is proposed for reception of coherent signals with the assumption that the directions-of-arrivals (DOA´s) of the uncorrelated interferers have been estimated a priori. First, the estimated DOA´s of the uncorrelated interferers are used to construct a transformation matrix. Secondly, the composite vector of the coherent sources is estimated based on the transformation matrix. Finally, using the estimated composite vector and the array correlation matrix, adaptive beamforming is performed. Experimental results show that the proposed beamformer almost achieves the optimum performance and rapidly converges. Finally, we also discuss how to counteract DOA error by high-order constraints