Keywords
Antenna gain, information theory, multiple-input multiple-output (MIMO) systems
Abstract
Multiantenna systems such as devices for multiple-input-multiple-output (MIMO) communication can theoretically use array superdirectivity to optimally exploit the propagation channel. In traditional analyses of MIMO systems, such superdirectivity is not observed due to the commonly applied constraint that limits the excitation current magnitudes. However, when an electromagnetically appropriate constraint on the power radiated by the array is applied, the computed capacity can include effects of transmit superdirectivity. A similar result occurs at the receiver for spatially colored noise. This paper formulates the MIMO system capacity under these circumstances and provides a framework for computing this capacity when the level of tolerable superdirectivity (as measured by the superdirectivity Q factor) is constrained. Example computations using the framework illustrate the impact that superdirectivity can have on achievable MIMO system performance.
Original Publication Citation
Morris, M. L., M. A. Jensen, and J. W. Wallace. "Superdirectivity in MIMO Systems." Antennas and Propagation, IEEE Transactions on 53.9 (25): 285-7
BYU ScholarsArchive Citation
Jensen, Michael A.; Morris, Matthew L.; and Wallace, Jon W., "Superdirectivity in MIMO systems" (2005). Faculty Publications. 352.
https://scholarsarchive.byu.edu/facpub/352
Document Type
Peer-Reviewed Article
Publication Date
2005-09-01
Permanent URL
http://hdl.lib.byu.edu/1877/1118
Publisher
IEEE
Language
English
College
Ira A. Fulton College of Engineering and Technology
Department
Electrical and Computer Engineering
Copyright Status
© 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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