Matrix analysis
Interpolated array minimum variance beamforming for correlated interference rejection
ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 06
Optimum beamformers for uniform circular arrays in a correlated signal environment
ICASSP '00 Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 05
Transformations for nonideal uniform circular arrays operating in correlated signal environments
IEEE Transactions on Signal Processing
Analysis of spatial smoothing with uniform circular arrays
IEEE Transactions on Signal Processing
Coherent Wide-Band Processing for Arbitrary Array Geometry
IEEE Transactions on Signal Processing
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The paper deals with the problem of adaptive array beamforming using a uniform circular array (UCA) in the presence of coherent interference. The well-known scheme of spatial smoothing (SS) widely used to tackle the coherent problem in the cases of 1-D uniform linear array (ULA) and uniform rectangular array (URA) cannot work for the UCA case. This is mainly due to the fact that the direction vector of each signal received by a UCA does not possess a Vandermonde structure. In this paper, we present a method based on subarray beamforming in conjunction with an averaging scheme to effectively mitigate the effect due to coherent interference in the UCA case. Theoretical analysis regarding the validity of the proposed method is also presented. Several simulation examples are provided for showing the effectiveness of the proposed method.