Ngày tải lên :
13/12/2013, 00:15
... VII European Signal Processing Conference,
Edinburgh, Scotland, Sept. 13-16, 1994.
[33] Porat, B. and Friedlander, B., Blind equalization of digital communication channels using
higher order moments,
IEEE ... multiuser
communications,
IEEE Trans. on Signal Processing, Special Issue on Signal Processing for
Advanced Communications,
45(1), Jan. 1997.
[10] Ding, Z., Blind channel identification and equalization using spectral correlation ... IntroductionandMotivation
Thischapterreviewstheapplicationsofantennaarraysignalprocessingtomobilenetworks.Cellular
networksarerapidlygrowingaroundtheworldandanumberofemergingtechnologiesareseentobe
criticaltotheirimprovedeconomicsandperformance.Amongtheseistheuseofmultipleantennas
andspatialsignalprocessingatthebasestation.ThistechnologyisreferredtoasSmartAntennasor,
moreaccurately,asSpace-TimeProcessing(STP).STPreferstoprocessingtheantennaoutputsin
bothspaceandtimetomaximizesignalquality.
Acellulararchitectureisusedinanumberofmobile/portablecommunicationsapplications.Cell
sizesmayrangefromlargemacrocells,whichservehighspeedmobiles,tosmallermicrocellsorvery
smallpicocells,whicharedesignedforoutdoorandindoorapplications.Eachoftheseoffersdifferent
channelcharacteristicsand,therefore,posesdifferentchallengesforSTP.Likewise,differentservice
deliverygoalssuchasgradeofserviceandtypeofservice:voice,data,orvideo,alsoneedspecific
STPsolutions.STPprovidesthreeprocessingleverages.Thefirstisarraygain.Multipleantennas
capturemoresignalenergy,whichcanbecombinedtoimprovethesignal-to-noiseratio(SNR).Next
isspatialdiversitytocombatspace-selectivefading.Finally,STPcanreduceco-channel,adjacent
channel,andinter-symbolinterference.
Theorganizationofthischapterisasfollows.InSection68.2,wedescribethevectorchannelmodel
forabasestationantennaarray.InSection68.3wediscussthealgorithmsforSTP.Section68.4outlines
theapplicationsofSTPincellularnetworks.Finally,weconcludewithasummaryinSection68.5.
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