Installation Guide

TVWhiteSpaceInstallationGuide Release1.0 B‐3
ScopeofthisAppendix
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antenna.
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).
Theairratesusedinthismodearesameaswhenusingsingleantennasinbothsites.
Table B‐1summarizesthesituation:(SM=SpatialMultiplexing)
SiteAandBmaybeHBSorSU.
B.3ConsiderationsforChangingAntenna
Parameters
Let:
maxAvailableTxPowerdenotethemaximumTxPowerpracticallyavailablefromanODU.(It
appearsasTxPowerperRadio.)
maxRegEIRPdenotethemaximumEIRPavailablebyregulation.Itwillbedeterminedbythree
factors:
• perband/regulation
• perchannelbandwidth
• antennagain
maxRegTxPowerdenotethemaximumregulatoryTxPowerfortheequipment,alsohaving
regardtheabovethreepoints.
TableB‐1:SpatialMultiplexing‐Diversitysettings
Numberof
Antennas
Mode
MaxFull
Duplex
Capacity
SiteA SiteB Sit eA SiteB
2 2
Spatial
Multiplexing
Spatial
Multiplexing
50Mbps
Diversity Diversity 25Mbps
2 1
Diversity Single 25Mbps
1 2
Single
Diversity
25Mbps
1 1
Single Single 25Mbps
FOR REGULATORY USES ONLY