Page 340 - Integrated Wireless Propagation Models

318 C h a p t e r F i v e

5.3.5 The General Formula of the Enhanced Lee In-Building Model
In the Lee in-building model, we introduce a general formula that is similar to the one
using for the same-floor scenario as
(5.3.5.1)

where P, is the power transmitted, G, is the transmitter antenna gain, P, is the receiver
antenna gain, and L( AJ ' L ( BJ ' L(C J ' and L( DJ are the path losses defined for each propagation
condition as described below.

5.3.5. 1 For the Same Floor
This case is shown in Fig. 5.2.2.1. There are five conditions to be specified as follows:
For considering only the LOS path-loss condition: (see Sec. 5.2.2.1)
(see Eq. (5.2.2.1.1))

L ( B) = L (C ) = L ( D) = 0
For considering NLOS path-loss conditions: (see Sec. 5.2.2.2)
a. Receiver is in the close-in zone
=
L ( AJ Lws same as LOS path-loss condition (see Eq. (5.2.2.2.1))
L ( B) = L (C) = L ( D) = 0
b. Receiver is not in close-in zone but in a room
L ( A) = L LOS (see Eq. (5.2.2.2.1))
L ( B) = L room (see Eq. (5.2.2.2.3))
L (c = J O
L ( D) = L;, wall (for the enhancement, see Eq. (5.2.8.3.4))
c. Receiver in a special room

L ( AJ = L ws (see Eq. (5.2.2.2.1))
L ( B) = L speciai room (see Eq. (5.2.2.3.1))
L(C) = 0
d. Receiver is outside the building
=
L ( AJ Lws (see Eq. (5.2.2.2.1))
L ( B) = L room (see Eq. (5.2.2.2.3))
L(C) = L outsi de (see Eq. (5.2.2.4.1))
L ( D) = L;, wall (for the enhancement due to the wave passing through interior
walls, see Eq. (5.2.8.3.2))

The general formulas of the Keenan-Motley and Lee models are shown in
Eqs. (5.2.8.1.1) and (5.2.8.1.2), respectively. In the Keenan-Motley model, there are four
attenuation factors. Each factor is used to adjust an in-building path-loss parameter. In
the Lee model, there are three different path losses selected due to the different scenarios.
All of them come from the measurement data. The implementation of the Lee model is
straightforward. The implementation of the Keenan-Motley model may need to account
for the sensitivity of adjusting the attenuation factors, as shown in the next section.