Modeling of Reverberant Radio Channels Using Propagation Graphs

Troels Pedersen, Gerhard Steinböck, Bernard Henri Fleury

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

75 Citationer (Scopus)
1302 Downloads (Pure)

Abstract

In measurements of in-room radio channel responses, an avalanche effect can be observed: earliest signal components, which appear well separated in delay, are followed by an avalanche of components arriving with increasing rate of occurrence, gradually merging into a diffuse tail with exponentially decaying power. We model the channel as a propagation graph in which vertices represent transmitters, receivers, and scatterers, while edges represent propagation conditions between vertices. The recursive structure of the graph accounts for the exponential power decay and the avalanche effect. We derive a closed-form expression for the graph's transfer matrix. This expression is valid for any number of interactions and is straightforward to use in numerical simulations. We discuss an example where time dispersion occurs only due to propagation in between vertices. Numerical experiments reveal that the graph's recursive structure yields both an exponential power decay and an avalanche effect.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Antennas and Propagation
Vol/bind60
Udgave nummer12
Sider (fra-til) 5978 - 5988
Antal sider11
ISSN0018-926X
DOI
StatusUdgivet - 2012

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