A robust beamforming method via exploitation of centro-symmetry property

This paper exploits a so-called centro-symmetry property of the array response manifold to improve the beamforming performances, such as better robustness to signal-to-noise (SNR) change, smaller number of snapshots, signal mismatches, or calibration errors, etc. For a uniform linear array (ULA), the structure of correlation matrix of array output is Hermitian and Toeplitz. Based on this property, the presented method exploits the space-time averaging techniques to modify the array covariance matrix. The simulation results show that the beamforming performance of the proposed method can be improved, especially on the condition that SNR is low and the number of snapshot is not enough.