Abstract—This paper deals with MIMO channel modeling according to the correlation level in underground railway tunnels for various antenna conﬁgurations for the transmitting and receiving arrays. MIMO channel matrices have been computed with a3D ray-tracingbased software at 2.4 GHz and 5.8 GHz in two different tunnel environments: 1) a 1-track empty tunnel with a square cross section, 2) a 1-track tunnel with a square cross section in which a train is parked between the transmitter and the receiver. In this paper, two different strategies are investigated to model the MIMO channel using theKronecker and theWeichselberger correlation based channel models. The ﬁrst one is to model theMIMO channel using a single model over the total tunnel length. The second one takes into account the correlation at the receiving side according to the transmitter-receiver distance.In thelatter solution,itispossible toisolate speciﬁc areas in the tunnel with speciﬁc correlation properties and model themin anindependent wayto take theminto account in a system simulation. In this paper, these two modeling strategies are compared in terms of channel capacity.
Index Terms—MIMO channels, correlation, underground tunnels, modal theory, models, Kronecker, Weichselberger
Cite:Y. Cocheril, M. Berbineau, P. Combeau, and Y. Pousset, "On the importance of the MIMO channel correlation in underground railway tunnels," Journal of Communications, vol. 4, no.3, pp.224-231, 2009.
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