NDLI: Adaptive beamforming with unknown scattering coefficients of near-field scatterers

Content Provider	IET Digital Library
Author	Liao, Ruiqian Xu, Jingwei Liao, Guisheng
Abstract	Conventionally, near-field scattering effect was considered in antenna measurement, which requires a great amount of measuring efforts and re-measurement if the operational platform has changed. In this study, the authors consider the near-field scattering problem in the framework of adaptive array beamforming theory, which avoids re-measurement and can be adaptive to the arbitrary scenario. Generally, the near-field scattering can result in severe performance degradation in adaptive beamforming applications. They propose a robust adaptive beamforming approach that can maintain the performance in the presence of near-field scatterers with unknown scattering coefficients. In the authors’ approach, the near-field scatterering signal component is incorporated into the presumed steering vector. Thus, it is treated as useful information in this study instead of nuisance interference in the literature. In particular, the properties of the far-field direct-path signal and near-field signal are explored and the large uncertainty set is divided into two small ones describing the far-field and near-field steering vectors, respectively. Simulation examples are provided to show the performance improvement by making use of the near-field scattering signals.
Starting Page	235
Ending Page	241
Page Count	7
ISSN	17519675
Volume Number	13
e-ISSN	17519683
Issue Number	Issue 2, Apr (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2018.5071
Journal	IET Signal Processing
Publisher Date	2018-10-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Array Beamforming Theory Framework Algebra Antenna Measurement Array Signal Processing Combinatorial Mathematics Electromagnetic Wave Propagation Electromagnetic Wave Scattering Far-field Direct-path Signal Far-field Steering Vector Near-field Scatterers Near-field Scattering Effect Near-field Scattering Problem Near-field Signal Near-field Steering Vector Robust Adaptive Beamforming Approach Set Theory Signal Processing And Detection Signal Processing Theory Uncertainty Set Unknown Scattering Coefficient Vector
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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