Radwin 2000 - Appendix F: Setting Antenna Parameters; Antenna Issues; About Single and Dual Antennas

RADWIN2000UserManual Release2.8.30 F‐1
AppendixF:
SettingAntennaParameters
AntennaIssues
ThechoiceofTxPower,antennagainandcableloss(betweentheradioandtheantenna)
determinestheEIRPandisaffecte dbysuchconsiderationsasradiolimitationsandregulatory
restrictions.
Beforeproceedingtoantennainstallationdetails,thefollowingbackgroundinformation
shouldbeconsidered:
AboutSingleandDualAntennas
EachRADWIN2000ODUhastworadiotransceivers(radios).Theradiosmakeuseof
algorithmsthatutilizebothMIMOandDiversityresultinginenhancedcapacity,rangeand
linkavailability.Thenumberofantennas(i.e.radios)usedisdeterminedbyuserconfiguration
andbyautomatic systemdecisions,explainedbelow.
DualAntennasattheBothLinkSites
Whenusingdualantennasatbothsites(singledual‐poleantennaortwosingle‐pole
antennas)youcanchoosebetweenMIMOModeandDive rsityMode.
MIMOMode
Underthismode,thesystemdoublesthelinkcapacity.Atthesametime,itkeepsthesame
rateandmodulationperradioaswasusedwithsingleantenna,thusincreasingcapacity,
rangeandavailability.
ForexamplewithadualantennaRADWIN2000cantransmitatmodulationof64QAMand
FECof5/6andgetanairrateof130Mbps,comparedto65Mbpswithsingleantenna.
Toworkinthismode,eachantennaportmustbeconnectedtoanantenna,theRSSlevelin
bothreceiversshouldbebalancedandaminimalseparationbetweentheantennasmustbe
maintained.(Forexample,byusingdualpolarizationantennasacrosspolarizationseparation
isattained).