Adaptive Processing for Beamforming with Coherent Interference Using Uniform Circular Arrays
Resource
Digital Signal Processing 18 (5): 813-834
Journal
Digital Signal Processing
Journal Volume
18
Journal Issue
5
Pages
813-834
Date Issued
2008-09
Author(s)
Abstract
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. © 2007 Elsevier Inc. All rights reserved.
Type
journal article
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