Handbook of Propagation Effects for Vehicular and ... - Courses

Earth-Satellite Propagation Effects Inside Buildings 8-23
after averaging the signal loss over the frequency band at each position (e.g., average at
approximately 900 frequency values). The averages of these means were then taken over
all locations (e.g., 16 positions of positioner times number of locations within the
building as given in last column of Table 8-13). Table 8-14 lists the mean value and
standard deviations given in Figure 8-13. The overall average is shown to be -11.9 dB
with an average standard deviation of 7.4 dB (last row of table). The mean relative signal
losses vary between -5 dB (in Farmhouse) and -19.5 dB in the House. Although both
have metal roofs, the House also has an aluminum heat shield in all exterior walls. The
other four buildings fall into the range of approximately -9 dB to -13 dB. These results
also include data in which the receiving antenna was located in an open door or window
in sight of the transmitter.
Relative Signal Level (dB)
10
0
-10
-20
-30
-40
-50
COMMONS
EERL
FARMHOUSE
HOUSE
Building
MER
±1.96*Std. Dev.
±1.00*Std. Dev.
Mean
MOTEL
Figure 8-13: Relative signal level statistics at each of the building locations.
Table 8-14: Listing of the mean and standard deviations when relative signal loss is
averaged over position and frequency (0.5 to 3.0 GHz).
Site Mean (dB) Standard Deviation (dB)
Commons -13.2 10.0
EERL -9.2 6.9
Farmhouse -5.0 3.8
House -19.5 11.6
MER -11.5 5.4
Motel -13.1 6.6
Overall Average -11.9 7.4