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Steering vector errors and diagonal loading

Vincent, François and Besson, Olivier Steering vector errors and diagonal loading. (2004) IEEE proceedings Radar, Sonar and Navigation, vol. 1 (n° 6). pp. 337-343. ISSN 1350-2395

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Official URL: http://dx.doi.org/10.1049/ip-rsn:20041069

Abstract

Diagonal loading is one of the most widely used and effective methods to improve robustness of adaptive beamformers. In this paper, we consider its application to the case of steering vector errors, i.e. when there exists a mismatch between the actual steering vector of interest and the presumed one. More precisely, we address the problem of optimally selecting the loading level with a view to maximise the signal to interference plus noise ratio in the presence of random steering vector errors. First, we derive an expression for the optimal loading for a given steering vector error and we show that this loading is negative. Next, this optimal loading is averaged with respect to the probability density function of the steering vector errors, yielding a very simple expression for the average optimal loading. Numerical simulations attest to the validity of the analysis and show that diagonal loading with the optimal loading factor derived herein provides a performance close to optimum.

Item Type:Article
Additional Information:Thanks to the Institute of Electrical and Electronics Engineers (IEEE). The original PDF can be found on the IEEE website: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1374146
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Laboratory name:
Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) - Signal, Communication, Antenne et Navigation - SCAN
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Deposited By: Francois VINCENT
Deposited On:21 Mar 2008 09:20

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