Keywords

Information theory, multiple-input multiple-output (MIMO) systems, time-varying channels

Abstract

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

Document Type

Peer-Reviewed Article

Publication Date

2007-05-01

Permanent URL

http://hdl.lib.byu.edu/1877/1058

Publisher

IEEE

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Electrical and Computer Engineering

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