Path Loss Equation; Table 6-10 Average Signal Loss Of Common Building Materials - ADC InterReach Fusion Installation, Operation And Reference Manual

6.5.1
1. Rappaport, Theodore S. Wireless Communications, Principles, and Practice. Prentice Hall PTR, 1996.
D-620610-0-20 Rev D

Path Loss Equation

In-building path loss obeys the distance power law
PL = 20log
where:
• PL is the path loss at a distance, d, from the antenna
• d = the distance expressed in meters
• d = free-space path loss distance in meters
0
• f = the operating frequency in Hertz.
• c = the speed of light in a vacuum (3.0 × 10
• n = the path loss exponent and depends on the building "clutter" and frequency
of operation
&
• = a normal random variable that depends on partition material and geome-
s
tries inside the building and is accounted for by the log-normal fade margin
used in the downlink RSSI design goal calculation
As a reference, Table 6-10 provides estimates of signal loss for some RF barriers
Average Signal Loss of Common Building Materials
Table 6-10
Partition Type
Metal wall
Aluminum siding
Foil insulation
Cubicle walls
Concrete block wall
Concrete floor
Sheetrock
Light machinery
General machinery
Heavy machinery
Equipment racks
Assembly line
Ceiling duct
Metal stairs
Help Hot Line (U.S. only): 1-800-530-9960
(4Sd f/c) + 10nlog (d/d
10 0 10
Loss (dB) Frequency (MHz)
26 815
20 815
4 815
1.4 900
13 1300
10 1300
1 to 2 1300
3 1300
7 1300
11 1300
7 1300
6 1300
5 1300
5 1300
Estimating RF Coverage
1
in equation (2):
&
) +
0
s
8
m/sec).
CONFIDENTIAL
(2)
1 .
6-15