NDLI: An Efficient Method to Determine the Diagonal Loading Factor Using the Constant Modulus Feature

Content Provider	IEEE Xplore Digital Library
Author	Wenlong Liu Shuxue Ding
Copyright Year	1991
Abstract	The diagonal loading method is a simple and efficient method that improves the robustness of beamformers. However, determining an ideal diagonal loading factor (DLF) is not a trivial problem, one that still has not been adequately addressed. Although beamformers are widely used in radar, sonar, and many other applications, in this correspondence, we consider a beamformer used only for digital communication applications. In digital communications, user information is coded into a sequence with the constant modulus (CM) in the baseband. Obviously, if the beamformer can cancel interference sufficiently well, the outputs of the beamformer should satisfy the CM condition more precisely. Therefore, minimizing CM errors can act as a natural criterion for determining DLFs. In this correspondence, we present a cost function based on the criterion. We also propose a direct search algorithm for DLF determination by minimizing the cost function. Numerical experiments show the effectiveness of the proposed method.
Sponsorship	IEEE Signal Processing Society
Starting Page	6102
Ending Page	6106
Page Count	5
File Size	187588
File Format	PDF
ISSN	1053587X
Volume Number	56
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensor arrays Interference Cities and towns Covariance matrix Digital communication Cost function Computer science Matrices Signal processing algorithms Robustness robust beamforming Constant modulus diagonal loading
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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