Adaptive beam forming without signal cancellation in the presence of coherent jammers

Adaptive beam forming using spatial smoothing has been proposed to combat coherent jammers. Recently, it has been found that this adaptive beam forming technique cannot avoid signal cancellation phenomena while also rejecting coherent jammers. In the paper, an approach is presented to eliminate the interaction between the desired signal and coherent jammers during the adaptation of spatial smoothing. As a result, the proposed beam former can effectively coherent jammers without signal cancellation. Moreover, the resulting output signal-to-noise ratio provides the information about the existence of the desired signal. Computer simulations confirm the theoretical work.