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1、.5GWIRELESSCOMMUNICATIONSYSTEMS:PROSPECTSANDHALLENGESCellularArchitectureandKeyTechnologiesfor5GWirelessCommunicationNetworksABSTRACTThefourthgenerationwirelesscommunicationsystemshavebeendeployedoraresoontobedeployedinmanycountries.However,withanexplosionofwirelessmobiledevicesandserv
2、ices,therearestillsomechallengesthatcannotbeaccommodatedevenby4G,suchasthespectrumcrisisandhighenergyconsumption.Wirelesssystemdesignershavebeenfacingthecontinuouslyincreasingdemandforhighdataratesandmobilityrequiredbynewwirelessapplicationsandthereforehavestartedresearchonfifthgenerat
3、ionwirelesssystemsthatareexpectedtobedeployedbeyond2020.Inthisarticle,weproposeapotentialcellulararchitecturethatseparatesindoorandoutdoorscenarios,anddiscussvariouspromisingtechnologiesfor5Gwirelesscommunicationsystems,suchasmassiveMIMO,energy-efficientcommunications,cognitiveradionet
4、works,andvisiblelightcommunications.Futurechallengesfacingthesepotentialtechnologiesarealsodiscussed.INTRODUCTIONTheinnovativeandeffectiveuseofinformationandcommunicationtechnologies(ICT)isbecomingincreasinglyimportanttoimprovetheeconomyoftheworld[1].Wirelesscommunicationnetworksareper
5、hapsthemostcriticalelementintheglobalICTstrategy,underpinningmanyotherindustries.Itisoneofthefastestgrowingandmostdynamicsectorsintheworld.TheEuropeanMobileObservatory(EMO)reportedthatthemobilecommunicationsectorhadtotalrevenueof€174billionin2010,therebybypassingtheaerospaceandpharmace
6、uticalsectors[2].Thedevelopmentofwirelesstechnologieshasgreatlyimprovedpeople’sabilitytocommunicateandliveinbothbusinessoperationsandsocialfunctions.Thephenomenalsuccessofwirelessmobilecommunicationsismirroredbyarapidpaceoftechnologyinnovation.Fromthesecondgeneration(2G)mobilecommunica
7、tionsystemdebutedin1991tothe3Gsystemfirstlaunchedin2001,thewirelessmobilenetworkhastransformedfromapuretelephonysystemtoanetworkthatcantransportrichmultimediacontents.The4GwirelesssystemsweredesignedtofulfilltherequirementsofInternationalMobileTelecommunications-Advanced(IMT-A)usingI
