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论文类型：期刊论文

发表时间：2008-12-01

发表刊物：IEEE TRANSACTIONS ON SIGNAL PROCESSING

收录刊物：SCIE、EI、Scopus

卷号：56

期号：12

页面范围：6102-6106

ISSN号：1053-587X

关键字：Constant modulus; diagonal loading; robust beamforming

摘要：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 bawband. 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.