Radwin 5000 HPMP - Appendix E: Setting Antenna Parameters; Antenna Issues; About Single and Dual Antennas

RADWIN5000HPMPUserManual Release3.5.70 E‐1
AppendixE:
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5000HPMPODUismadeoftworadiotransceivers(radios).Theradiosmake
useofalgorithmsthatutilizebothSpatialMultiplexing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HBSandanHSU
Whenusingdualantennasatbothsites(singlebipolarantennaortwomo‐unipolarantennas)
youcanchoosebetweenSpatialMultiplexingModeandDiversityMode.
SpatialMultiplexing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5000HPMP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).