Introduction
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There
are several empirical indoor propagation modells included in WinProp.
All these models consider only the direct ray between transmitter and
receiver. Therefore
the prediction is very fast, but with limited accuracy in contrast to
WinProp's deterministic models, like the 3D
Intelligent Ray Tracing, the 3D
Standard Ray Tracing, and the Indoor
Dominant Path Model.
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One
Slope Model
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The
One Slope Model is very fast, because it depneds only on the distance
r between
transmitter and receiver. The only parameter which is
considered is therefore the path loss exponent.
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Prediction
with the One Slope Model
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With the path
loss exponent, the model is calibrated for each scenario. Walls and
other elements in the building database are not considered in the One
Slope Model.
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Motley
Keenan Model
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The
Motley Keenan Model considers all walls intersecting the direct ray
between
transmitter and receiver. An attenuation can be defined by the user for
the walls (LW) and the ceilings (LC). This
attenuation is then used for all walls and ceilings intersecting the
direct ray.
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Prediction
with the Motley Keenan Model
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COST
231 Multi-Wall Model
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The
COST 231 Model is the most sophisticated empirical model. All walls
intersecting the direct ray between transmitter and receiver are
considered and
for each wall individual materaial properties are taken into account.
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Prediction
with the COST 231 Model
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As
predictions with the COST 231 models are often too pessimistic....
Therefore an extension was added to the model: With increasing
number of penetrated walls, the individual attenuations (due to the
material properties) of the walls are decreased.
With this extension, the COST 231 model achieves good results with very
fast computation times.
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