Installation Guide

RADWIN5000InstallationGuide DQ0266610/A.01 B‐2
ScopeofthisAppendix
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ex ample,byusingdualpolarizationantennasacrosspolarizationseparation
isattained).
UponselectingAntennaTypeasDual,RADWIN5000automaticallyselectsthismodeand
doublestheairrates.
RADWINManagerindicatesacaseofunbalancedRSSbetweenthetwoantennasintheHBS
panels.
DiversityMode
DiversityModeusestwoantennastoimprovethequalityandreliabilityofthelink.Often,
thereisnotaclearline‐of‐sight(LOS)betweentransmitterandreceiver.Insteadthesignalis
reflectedalongmultiplepathsbeforefinallybeingreceived.
Eachsuch“bounce”canintroducephaseshifts,timedelays,attenuations,andeven
distortionsthatcandestructivelyinterferewithoneanotherattheapertureofthereceiving
antenna.Antennadiversityisespeciallyeffectiveatmitigatingthesemulti‐pathsituations.
Thisisbecausemultipleantennasaffordareceiverseveralrecordingsofthesamesignal.Each
antennawillbeexposedtoadifferentinterferenceenvironment.Thus,ifoneantennais
undergoingadeepfade,itislikelythatanotherhasasufficientsignal.Collectivelysucha
systemcanprovidearobustlink.
Antennadiversityrequiresantennaseparationwhichispossi blebyusingadual‐polarization
antennaorbytwospatiallyseparatedantennas.
UseDiversityinsteadofSpatialMultiplexinginthefollowingsituations:
• WhenthesystemcannotoperateinSpatialMultiplexingMode
• Whenoneofthereceivershashighinterferencecomparedtothesecondreceiver(i.e.
thesystemis“unbalanced”)
• WhenyouachievehighercapacityinDiversityModethaninSpatialMultiplexingMode
• WhenhighrobustnessisofimportanceandthecapacityofDiversityModeissufficient
(upto25Mbpsfullduplex)
B.2.2SingleAntennasatBothSites
ByselectingasingleantennaattheHBSandSU,theODUsoperatewithasingleradiothatis
connectedtotheANT1connector.Thesecondradioisautomaticallyshutdown.
B.2.3SingleatOneSite,DualAntennasattheOther
InthismodeoneofthesitesusestheODUwithasingleantennawhiletheothersiteusesthe
ODUwithadualante nna.
Theadvantagesinthismodeincomparisontousingasingleantennainbothsitesare
doubledtotalTxPowerandadditionalpolarizationand/or spacediversity(dependingonthe
polarizationofinstalledantennas).