标签: diversity

DualPolarizedBaseStationAntennasForPolarizationDiversitysystemsDualPolarizedBaseStationAntennasForPolarizationDiversitySystemsItiswellknownthatinacellularnetwork,mobilephoneshaveconsiderablylowertransmittalpowerthanthetransmittersofthebasestations.Thismeansthatthetransmissionfromthemobilephonetothebasestation(uplink)ismuchmoreunfavorableinrelationtothetransmissionfromthebasestationtothemobilephone(downlink).Tocompensatethis,awayofimprovingthequalityofreceptionatbasestationshadtobefound.Duetothemulti-pathsignalpropagationofradiosignals,whichoccursinurbanareas,socalledSpaceDiversityReceptionhasbeenintroducedwhichprovidesthebestresultsinthefield.SpaceDiversityReceptionisbasedonthefollowingidea:Thesignaltransmittedbyamobilephonei……

DiversityCombiningTechniquesDiversityCombiningTechniquesWhentherequiredsignalisacombinationofseveralplanewaves(i.e,multipath),thetotalsignalamplitudemayexperiencedeepfades(i.e,Rayleighfading),overtimeorspace.Themajorproblemistocombatthesedeepfades,whichresultinsystemoutage.MostpopularandefficienttechniquefordoingsoistousesomeformofdiversitycombiningDiversity:multiplecopiesoftherequiredsignalareavailable,whichexperienceindependentfading(orclosetothat)Typesofdiversity.3/11/2003Lecture17:ELG7178W:SmartAntennasS.Loyka,Winter20031TypesofDiversitySpacediversity.AntennasareseparatedinspaceAnglediversity.MultiplecopiesoftherequiredsignalhavedifferentAOA’sFrequencydiversity.Multiplecopiesaretransmi……

jointclockrecoveryandbasebandcombiningforthediversityradiochannel……