Information theory, multiple-input multiple-output (MIMO) systems, time-varying channels
Time-variant multiple-input multiple-output (MIMO) channels are measured in an outdoor campus environment at 2.45 GHz with directional patch arrays and omnidirectional monopole arrays. A number of useful metrics are proposed for quantifying time variation in MIMO channels: eigenvalue level crossing rate, eigenvector angular deviation, and capacity loss for delayed transmit and receive channel state information (CSI). Measurements in four different environments confirm the strong correlation between angular spread of multipath and MIMO channel time variability. The rate of time variation is also strongly influenced by the type of array, indicating that directional elements may be advantageous for highly mobile environments. The proposed metrics indicate that although the physical communication layer may need to update CSI several times per wavelength, the required rate of adaptation in transmit rate, modulation, and power allocation is much less severe.
Original Publication Citation
Wallace, J. W., et al. "Experimental Characterization of the Outdoor MIMO Wireless Channel Temporal Variation." Vehicular Technology, IEEE Transactions on 56.3 (27): 141-9
BYU ScholarsArchive Citation
Jensen, Michael A.; Warnick, Karl F.; Wallace, Jon W.; Gummalla, Ajay; and Lee, Harry B., "Experimental characterization of the outdoor MIMO wireless channel temporal variation" (2007). All Faculty Publications. 257.
Ira A. Fulton College of Engineering and Technology
Electrical and Computer Engineering
© 2007 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.
Copyright Use Information