User's Manual Part 1

3-6 LGCell Site Planning and Design
Office Antenna Coverage for 1800/1900 MHz Frequency Applications
The preceding tables show estimated clutter-defined path loss slope (PLS)
for different frequencies at various kinds of sites. If you change the design
goal or other parameters, these numbers will change based on the PLS.
If the design parameters (output power per carrier, design goal, antenna gain, and
fade margin) differ from those stated above, you can use the PLS value shown in
the preceding tables in the following formula to estimate the area of coverage per
antenna:
The PLS is a general path loss number which takes into account free space
loss and normal barriers to the RF signal. Severe obstructions such as
metal, cement walls, or elevator shafts are best accounted for by a physical
site survey.
Facility PLS Coverage per Antenna (Square Feet)
Open
-
80% cubicles/20% offices 25.2 20,000
80% - 50% cubicles/50% offices 25.7 15,000
10% - 20% cubicles/80% offices 26.5 10,000
Path Loss Formulas
Path Loss (dB) = PLS * log 4
π
fD
/
c
Note: Path Loss Slope = PLS dB/decade for free space loss
D
is the distance in meters
f
is the frequency in MHz
c
is the speed of light
Path Loss=Power per Carrier + Antenna Gain - Fade Margin - Design Goal (dBm)
To convert feet to meters:
Area = (
D
x 3.281)
2
x
π
D
= [10
(Path Loss / PLS)
] x [
c
/
(4
π
f
)]