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毕业设计〔论文〕
题目: LTE的关键技术和开展
学院大学
专业(层次) 专升本
olution)is posed of 3GPP(The3rdGenerationPartnershipProject,the third generation partnership project)to organize the formulation ofUMTS(UniversalMobileTelemunicationsSystem,a universal mobile telemunication system)long term evolutionof the technical standards,in 2004Decemberofficially launchedthe projectinTorontoand the3GPPTSGRAN#26 introducesOFDM(OrthogonalFrequencyDivisionMultiple*ing,orthogonalfrequency division multiple*ing)and MIMO(Multi-Input& Multi-Output,multiple input multiple output)and other keytransmission technology,significantlyincreases the spectral efficiencyand data transmission rate(20Mbandwidth of 2*2MIMOin 64QAMcases,theoreticaldownlinkma*imum transmission rate of 201Mbps,after theremoval ofthe signaling overheadwas about 140Mbps,but according to thelimit,the actual networkand terminalcapacitygenerallydownlink peak rate is 100Mbps,on thebehavior of 50Mbps),andsupport for multiplebandwidth allocation:,3MHz,5MHz,10MHz,15MHzand 20MHz,andsupportthe global mainstream2G/3G band andsome of the newband,thus thespectrum allocationmore fle*ible,system capacityand coveralso significantly enhance network architecture ismore flatsimple,reduces the networknode and theple*ity of the system,thus has reduced the systemdelay,but also reduces thecost ofnetwork deployment and LTE system to supportinteroperabilitywith other system has twotypes:FDD-LTE andTDD-LTE,.,frequency division duple*time division duple*LTEsystem andLTE system,the maindifference between the twois that physicallayertechnologyon theairinterface(likeframe structure,time divisionsynchronousdesign,etc.).FDD-LTEsystem of venton thedownlink transmissionuses a pair ofsymmetricalband receivingand sending data,while the TDD-LTE systemuplink and downlinkisusing the samebandtransmissionindifferent time slots,relative t
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