Adaptive array algorithm using spatial interpolation for the cancellation of coherent interferences

An adaptive array system is a candidate to increase the channel capacity by rejecting interferences. However adaptive array systems are hard to remove all the interferences when incident signals are coherent with a desired signal. In this paper, we propose a modified Duvall beamformer, which performs spatial smoothing using spatial interpolation technique to maintain the degree of freedom. The proposed algorithm can minimize the loss in the degree of freedom due to spatial smoothing by forming subarrays with interpolated signals. Simulation results show that the proposed algorithm can remove all the interferences while conventional beamformer cannot.