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Modeling Propagation in Multifloor Buildings Using the FDTD Method

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3 Author(s)
Austin, A.C.M. ; Dept. of Electr. & Comput. Eng., Univ. of Auckland, Auckland, New Zealand ; Neve, M.J. ; Rowe, G.B.

A three-dimensional parallel implementation of the finite-difference time-domain (FDTD) method has been used to identify and isolate the dominant propagation mechanisms in a multistorey building at 1.0 GHz. A novel method to visualize energy flow by computing streamlines of the Poynting vector has been developed and used to determine the dominant propagation mechanisms within the building. It is found that the propagation mechanisms depend on the level of internal clutter modeled. Including metallic and lossy dielectric clutter in the environment increases attenuation on some propagation paths, thereby altering the dominant mechanisms observed. This causes increases in the sector-averaged path loss and changes the distance-dependency exponents across a floor from 2.2 to 2.7. The clutter also reduces Rician K-factors across the floor. Directly comparing sector-averaged path loss from the FDTD simulations with experimental measurements shows an RMS error of 14.4 dB when clutter is ignored. However, this is reduced to 10.5 dB when the clutter is included, suggesting that the effects of clutter should not be neglected when modeling propagation indoors.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 11 )

Date of Publication:

Nov. 2011

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