Abstract
Due to the open and shared nature, wireless communication systems are vulnerable to jamming attacks. Beamforming is a promising technique to counteract the impact of jamming attacks. However, when the location of the desired signal is close to that of the jamming signal, the performance of the traditional anti-jamming beamformer that uses isotropic antenna elements is significantly degraded due to the indistinguishable signals and interferences in the space domain. In this paper, an enhanced countermeasure method for jamming attacks has been proposed by using the polarized beamforming with a planar array. By integrating both polarization and space information, the proposed beamformer is able to suppress the interference that is close to the desired signal. The beamformer is designed using the Linearly Constrained Minimum Variance (LCMV) criterion. The analytical expression of the steering vectors is derived for far-field propagation. The Bit Error Rate (BER) performance of the proposed jamming defense system is examined. Simulation results show a significant performance improvement of the proposed anti-jamming system even when the desired signals and interferences are coming from the same direction.
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