User's Manual Part 1

Estimating RF Coverage
InterReach Fusion Wideband Installation, Operation, and Reference Manual Page 83
D-620616-0-20 Rev H • TECP-77-044 Issue 7 • May 2013 © 2013 TE Connectivity Ltd.
Youcancalculatethedistance,d,correspondingtothemaximumallowablepathlossusing
equationsintroducedinthefollowingsections.
Equation2—PathLossEquation
In‐buildingpathlossobeysthedistancepowerlawinEquation2:
PL=20log
10
(40f/c)+10nlog
10
(d/d
0
)+X
s
where:
• PListhe
pathlossatadistance,d,fromtheantenna
• d=thedis
tanceexpressedinmeters
• d0
=free‐spacepathlossdistanceinmeters
• f
=theoperatingfrequencyinHertz.
• c=
thespeedoflightinavacuum(3.0×10
8
m/sec).
• n=thepathlossexponentanddependsonthebuildin
g“clutter”andfrequencyofoperation
• X
s
=anormalrandomvariablethatdependsonpartitionmaterialandgeometries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66providesestimatesofsignall
ossforsomeRFbarriers
1
.
1 Rappaport,TheodoreS.WirelessCommunications,Principles,andPractice.PrenticeHallPTR,1996.
Table66. AverageSignalLossofCommonBuildingMaterials
Partition Type Loss (dB) Frequency (MHz)
Metal wall 26 815
Aluminum siding 20 815
Foil insulation 4 815
Cubicle walls 1.4 900
Concrete block wall 13 1300
Concrete floor 10 1300
Sheetrock 1 to 2 1300
Light machinery 3 1300
General machinery 7 1300
Heavy machinery 11 1300
Equipment racks 7 1300
Assembly line 6 1300
Ceiling duct 5 1300
Metal stairs 5 1300