ISSN : 1796-2021
Volume : 4    Issue : 4    Date : May 2009

Modeling and Understanding MIMO Propagation in Tunnels
Jose-Maria Molina-Garcia-Pardo, Martine Lienard, Paul Stefanut, and Pierre Degauque
Page(s): 241-247
Full Text:
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This paper first presents an application of the modal theory for interpreting experimental results of
the electromagnetic field variation along a tunnel. The transmitting frequency is assumed to be high
enough so that the tunnel behaves as an oversized waveguide. Then, for a Multiple-Input
Multiple-Output channel, theoretical results of the channel capacity are given. To explain the
decrease of the capacity at large distance from the transmitter, even by assuming a constant signal
to noise ratio, an approach based on the calculation of the eigenvalues of the transfer matrix in a
reference scenario is described.

Index Terms
MIMO, propagation, information theory, modal theory, measurements.