Journal
IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume 56, Issue 12, Pages 6102-6106Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSP.2008.2005862
Keywords
Constant modulus; diagonal loading; robust beamforming
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [20500209]
- National Natural Science Foundation of China [10672036]
- Grants-in-Aid for Scientific Research [20500209] Funding Source: KAKEN
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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.
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