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

Earth-Satellite Propagation Effects Inside Buildings 8-5
% POWER WITH DELAY < ABSCISSA
99.9
99.5
99.0
98.0
95.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
5.0
2.0
1.0
Small Room (Site 2)
Metal Shack (Site 4)
Foyer in Large Building (Site 3)
0 10 20 30 40 50 60 70 80 90 100
DELAY (ns)
Figure 8-2: Approximate cumulative distributions of time delay at three locations.
8.2.4 Cumulative Distributions of Signal Levels
Figure 8-3 gives the relative signal level versus frequency for a series of fixed
probabilities ranging from 1% to 99%. These statistics reflect a database of vertical and
horizontal scans at several locations within Site 2 and averaged over bandwidths of 1, 2,
5, 9, 18, 45, and 90 MHz. We note, for example, that 1% of the signal levels exceeded
0 dB at approximately 0.75 GHz to -4 dB at 1.75 GHz, whereas at the probability of 50%,
signal levels exceeded -5 to -14 dB at these respective frequencies. The general trend of
the probability contour is such that the losses increase with increasing frequency.