NDLI: Flexible robust adaptive beamforming method with multiple separately widened nulls

Content Provider	IET Digital Library
Author	Liu, Ziwei Zhao, Shanshan Zhang, Gengxin
Abstract	With the development of the array signal processing techniques, more and more robust methods are proposed for non-stationary interference cancellation at the beamforming stage. Among these methods, null widening methods or well-known covariance matrix taper (CMT) methods are the research hotspots. However, the typical CMT-class methods modified the whole covariance matrix with the same taper matrix, which means that all the nulls produced by the covariance matrix will be widened to the same width in cosine angular domain. This will make a waste of degrees of freedom (DOFs) in the scene that different interference sources have a different degree of non-stationarity. In this Letter, also adopting CMT structure, a flexible widening method is discussed, which utilises the relationship between each eigenvector and the steering vector of each interference source. The proposed method can widen different nulls with different width, which can save the consumption of DOFs as many as possible according to the demand. Besides, as a subspace-based method, it can preserve the minimal sample support property. The simulation results show the effectiveness of the proposed method.
Starting Page	957
Ending Page	959
Page Count	3
ISSN	00135194
Volume Number	56
e-ISSN	1350911X
Issue Number	Issue 18, Sep (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/56/18
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2020.1432
Journal	Electronics Letters
Publisher	The Institution of Engineering and Technology
Publisher Date	2020-07-07
Access Restriction	Open
Rights License	Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Subject Keyword	Array Signal Array Signal Processing Beamforming Stage CMT Structure Cosine Angular Domain Covariance Matrices Covariance Matrix Taper Method Different Interference Sources Different Nulls Different Width Eigen Values And Eigen Function Electromagnetic Compatibility Flexible Robust Adaptive Beamforming Method Flexible Widening Method Interference Interference Source Interference Suppression Interpolation And Function Approximation Linear Algebra Multiple Separately Widened Nulls Nonstationarity Nonstationary Interference Cancellation Numerical Analysis Research Hotspots Robust Method Signal Processing And Detection SubSpace-based Method Taper Matrix Typical CMT-class Method
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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