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

Earth-Satellite Propagation Effects Inside Buildings 8-7
Rayleigh distributions provided a better fit than the Gaussian distribution. Also given in
Table 8-3 are the overall averages (of the averages) including the worst site (Site 6) and
excluding it. It is noted, for example, that the average for all sites is 12.7 dB with a
standard deviation of 5.5 dB. When Site 6 is excluded, the overall average is 10.2 dB
with a standard deviation of 5.8 dB.
Table 8-3: Mean and standard deviation of best fit Gaussian distributions for frequency
and spatial averaging.
Site
Average Case Best Case
Mean (dB) STD (dB) Mean (dB) STD (dB)
1 -7.9 5.5 -4.2 4.2
2 -9.1 4.4 -5.4 4.2
3 -15.4 8.4 -9.7 6.7
4 -9.7 6.3 -5.2 4.9
5 -9.0 4.5 -5.4 3.7
6 -24.9 3.8 -19.8 3.4
Average (Sites 1 to 6) 12.7 5.5 8.3 4.5
Average (Sites 1 to 5) 10.2 5.8 6.0 4.7
Table 8-4 lists the median of the relative power levels at all the site locations for the
“average and “best” cases (defined previously) over the frequency interval 750 MHz to
1750 MHz. The smallest and largest median power levels are given over this frequency
for each of the cases as well as the overall averages “with” and “without” the worst case
Site 6 (last two rows). It is noted that Sites 3 and 6 had the most severe fading. Site 3
experienced more than 15 dB fading when the line-of sight path passed through a
reflective glass door. The overall averages of the largest fade medians are less than -
14.8 dB and -13 dB with and without Site 6.
Table 8-4: Relative median power levels over frequency interval 750 MHz to 1750 MHz.
Site #
Average Case (dB) Best Case (dB)
Smallest Largest Smallest Largest
1 -5 -11 -2 -6
2 -5 -14 -2 -5
3 -17 -18 -12 -13
4 -9 -11 -5 -6
5 -5 -11 -3 -5
6 -20 < -24 -16 -22
Average (1-6) -10.2