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

Earth-Satellite Propagation Effects Inside Buildings 8-17
Table 8-9: Summary of statistics associated with spatial variations of L- (1618 MHz) and
S-Band (2492 MHz) co-polarized relative power levels during spatial scans inside
buildings.
Building
L-Band S-Band
Mean (dB) STD (dB) Mean (dB) STD (dB)
Correlation
Commons -19.9 8.1 -18.0 7.2 0.56
EERL -15.0 6.9 -15.6 6.9 0.34
Farmhouse -7.4 6.1 -7.9 7.1 0.28
House -10.6 5.7 -9.6 5.1 0.13
Motel -19.8 6.3 -20.1 5.6 0.05
Store -14.7 6.2 -19.5 7.3 0.34
Average -14.6 6.5 -15.1 6.5 0.28
Table 8-10: Summary of statistics associated with spatial variations of L- (1618 MHz)
and S-Band (2492 MHz) cross-polarized relative power levels during spatial scans inside
buildings.
Building
L-Band S-Band
Mean (dB) STD (dB) Mean (dB) STD (dB)
Correlation
Commons -16.0 6.1 -15.5 7.1 0.21
EERL -18.1 5.4 -16.0 5.4 0.01
Farmhouse -10.3 8.0 -11.6 8.7 0.54
House -16.2 5.6 -15.4 5.8 0.12
Motel -21.0 6.0 -19.8 5.1 0.16
Store -20.0 6.4 -22.0 6.0 0.15
Average -16.9 6.25 -16.7 6.35 0.20
Table 8-11 summarizes the statistics associated with the instantaneous differences in the
S-and L-Band powers received during the spatial scans at the various site locations. The
difference power level was found to be Gaussian distributed as depicted by the example
given in Figure 8-10. The mean difference indicates whether on average there is a bias of
the power levels at one frequency relative to the other. We note that on average, the bias
ranges from +1.9 dB for the Commons to -4.8 dB for the Store sites, with an overall
average bias of approximately -0.6 dB. For all sites, the standard deviations are
significantly larger than the respective means. The relative lack of correlation between
the instantaneous L- and S-Band fades suggests the difficulty of applying power control
to a link operating in this environment.