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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 939104, 7 pages
http://dx.doi.org/10.1155/2012/939104
Research Article

Spatial Correlation and Ergodic Capacity of MIMO Channel in Reverberation Chamber

Department of Signals and Systems, Chalmers University of Technology, 41296 Gothenburg, Sweden

Received 27 July 2011; Accepted 26 September 2011

Academic Editor: Li Yang

Copyright © 2012 Xiaoming Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It has previously been shown that a reverberation chamber can conveniently be used to measure ergodic multiple-input multiple-output (MIMO) capacity for over-the-air (OTA) tests. However, the MIMO channel in the reverberation chamber has not been fully studied before. In this paper, the spatial correlation of the MIMO channel in the chamber is studied by comparing the measured channel with two popular MIMO channel models. It is shown that the models can accurately predict the ergodic MIMO capacity of the channel in the reverberation chamber, but not the outage capacity (especially at high signal-to-noise regime). It is verified that the capacity estimation error is due to the fact that the measured MIMO channel in the chamber does not satisfy multivariate normality (MVN), which causes the capacity error increases additively with MIMO size and multiplicatively with signal-to-noise (SNR).