NDLI: Adaptive interference nulling with pattern maintaining under mainlobe subspace and quadratic constraints

Content Provider	IET Digital Library
Author	Ma, Xiaofeng Lu, Le Sheng, Weixing Han, Yubing Zhang, Renli
Abstract	A fast adaptive interference nulling algorithm with arbitrary pattern maintaining without direction of arrival is proposed under the framework of generalised sidelobe canceller (GSC). The problem is formulated to optimise the weight by minimising the total output power of the beamformer, while keeping the antenna gain accurately approximated to that of the quiescent pattern by the mainlobe subspace constraint (MSC) and the weight quadratic constraint. The MSC is constructed by the dominant eigenvectors of the mainlobe covariance matrix. The closed-form solution to this problem is obtained by two steps. First, the quadratic constraint is relaxed to obtain the weight in the form of a GSC beamformer with diagonal loading (DL) sample covariance matrix. Then, the stringent quadratic constraint is guaranteed by optimising the DL level, which is precisely estimated by a simple iterative equation. The maintenance of pattern mainlobe and the reduction of the computation complexity can be achieved simultaneously. Numerical experiments are performed to demonstrate the effectiveness and efficiency of the proposed algorithm, and discuss the influence of mutual coupling between antenna elements.
Starting Page	40
Ending Page	48
Page Count	9
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0543
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-09-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Array Antenna Radiation Pattern Arbitrary Pattern Covariance Matrices Diagonal Loading Sample Covariance Matrix Fast Adaptive Interference Nulling Algorithm Generalised Sidelobe Canceller GSC Beamformer Interpolation And Function Approximation Iterative Method Linear Algebra Mainlobe Covariance Matrix Mainlobe SubSpace Constraint MSC Numerical Analysis Simple Iterative Equation Weight Quadratic Constraint
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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