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

Earth-Satellite Propagation Effects Inside Buildings 8-3
Table 8-2: Site descriptions of indoor propagation measurements of Vogel and Torrence
[1993].
Site # Description
1
2
3
4
5
6
A corner office (6 X 7 m) with two large windows in a single-story building.
Walls are of concrete-block masonry with the interior covered with
plasterboard. The ceiling is comprised of acoustic tiles suspended at a height of
3 m from metal hangers. A double-glazed optically reflective window is located
in the wall toward the transmitter. Roof is flat and consists of concrete panels
supported by steel beams. Room is furnished with wooden office furniture.
Also referred to as the EERL Building
A small room in another building (3 X 4 m) with two windows and construction
similar to Site 1. Room furnished with metal filing cabinets.
A 5 X 5 m corner foyer in another building where a large reflective glass door
encompasses half of one outside wall. The external walls are of concrete wall
construction, and internal walls have metal frames covered with plasterboard.
Also referred to as the Commons.
A 3 X 6 m shack with corrugated sheet-metal walls and roof on the outside and
plywood on the inside. It has one window on each of the two narrow sides and
a metal-covered door centered between two windows on one of the wide sides.
An 1870 vintage restored and furnished two-story house with wood siding. The
walls are filled with rock wool and covered with plasterboard on the interior and
wood siding on the exterior. The gabled roof is covered with wood shingles.
Measurements were made in two rooms on the ground floor and one room on
the second level. Also referred to as the Farmhouse.
A 12 X 2.4 m empty mobile trailer home with sheet-metal exterior and
aluminum frame windows with metal screens.
8.2.2 Multipath Interference During Frequency and Position Sweep
Elevation
Angle
27.5°
An example of maximum and minimum multipath interference (of relative signal level)
experienced inside Site 2 is given in Figure 8-1 for a composite frequency sweep and
vertical position scan near a window. The set of curves labeled maximum and minimum
were derived by executing a frequency sweep between 700 MHz to 1800 MHz for each
antenna position and culling out the maximum and minimum signal levels (upper and
lower traces) at each frequency. The center thick curve is an example of the signal
variability when the antenna position was fixed at an arbitrary position over the
frequency interval. The large variability of the signal due to receiver antenna position
and frequency changes demonstrates that multipath effects may be significant over the
indicated position and frequency intervals. For example, the minimum trace shows signal
levels which vary between -5 dB to smaller than -30 dB, the maximum trace shows signal
levels which vary between +2 dB and -9 dB, and the fixed antenna position trace shows a
variability between 0 to -30 dB.
18°
16°
25°
25°
45°