Artificial Interference Power Estimation for Beamforming under Sidelobe Soft Constraint

Zeng Cao; Zhou Zheng-guang; Liao Gui-sheng

doi:10.3724/SP.J.1146.2006.00734

Volume 29 Issue 12

Jan. 2011

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Article Navigation > Journal of Electronics & Information Technology > 2007 > 29(12): 2827-2831

Zeng Cao, Zhou Zheng-guang, Liao Gui-sheng. Artificial Interference Power Estimation for Beamforming under Sidelobe Soft Constraint[J]. Journal of Electronics & Information Technology, 2007, 29(12): 2827-2831. doi: 10.3724/SP.J.1146.2006.00734

Citation:

Zeng Cao, Zhou Zheng-guang, Liao Gui-sheng. Artificial Interference Power Estimation for Beamforming under Sidelobe Soft Constraint[J]. Journal of Electronics & Information Technology, 2007, 29(12): 2827-2831. doi: 10.3724/SP.J.1146.2006.00734

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Artificial Interference Power Estimation for Beamforming under Sidelobe Soft Constraint

doi: 10.3724/SP.J.1146.2006.00734

Received Date: 2006-05-29
Rev Recd Date: 2006-12-11
Publish Date: 2007-12-19

Abstract

Abstract

Often in practice the directional knowledge of signal of interest or interferences is imprecise, the adaptive beamformer with linear constraint is hypersensitive to the array imperfection which leads to the output Signal-to-Interference-plus-Noise Ratio (SINR) decreases when the input Signal-to-Noise Ratio (SNR) exceeds a certain threshold. In order to improve the robustness of the beamformer, a new method for estimating the artificial interference power under sidelobe soft constraint is proposed. Based on the prior coarse knowledge of Direction of Arrival (DOA) of the interferences and using the subspace projection and the null area extension techniques, the artificial interference power can be obtained through the iterative procedure under the soft constraint of the maximum peak undulation in sidelobe area. The method is not sensitive to the look direction mismatch and the sensors gain error with low sidelobe level and deep null. Numerical examples demonstrate its effectiveness and robustness comparing with other methods.

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References(1)

References

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