MOOC 无线通信原理（双语）-南京邮电大学 中国大学慕课答案

MOOC无线通信原理（双语）-南京邮电大学中国大学慕课答案IntroductiontoWirelessCommunicationsIntroductiontoWirelessCommunications1、问题：Ifacarrierfrequencyf=60GHzisadoptedforawirelesscommunication,thewavelengthλofthecarrierwaveis___.选项：A、5mmB、10mmC、20mmD、50mm正确答案:【5mm】2、问题：TheBluetoothsystemsbelongtothewirelessnetworkof___.选项：A、WMANB、WLANC、WPAND、WWAN正确答案:【WPAN】3、问题：In2000,ITUapprovedthreestandardsofWCDMA,CDMA2000and___.选项：A、TD-CDMAB、IS-95C、GSMD、TD-SCDMA正确答案:【TD-SCDMA】4、问题：Forawirelesscommunicationsystem,iftheinputpoweris8dBm,andtheoutputpoweris5dBm,thesystemattenuationis___.选项：A、3dBmB、3dBC、13dBmD、13dB正确答案:【3dB】5、问题：Mostcellphonesoperateinthefrequencyrangeof800to2,200KHz.选项：A、正确B、错误正确答案:【错误】6、问题：WIFIisawirelesslocalnetworkthatrunsoftheIEEE802.15standardsset.选项：A、正确B、错误正确答案:【错误】7、问题：Frequencydivisionduplexingsystemusesdifferenttimeslotsfortheforwardandreversechannels.选项：A、正确B、错误正确答案:【错误】8、问题：TheShannoncapacitydeterminesthetheoreticallimitonchannelcapacityforagivenbandwidthandsignal-to-noiseratio.选项：A、正确B、错误正确答案:【正确】TheCellularConcept:SystemDesignFundamentalsTheCellularConcept:SystemDesignFundamentals1、问题：Inthecellularnetworks,thecoverageareaofeachbasestationisnamedascell.选项：A、正确B、错误正确答案:【正确】2、问题：IntheN-Cellreusepattern,thefrequencyreusefactoris1/N.选项：A、正确B、错误正确答案:【正确】3、问题：Inadynamicchannelassignmentstrategy,eachcellisallocatedapredeterminedsetofchannels.选项：A、正确B、错误正确答案:【错误】4、问题：Foraproperhandoffsituation,thehandoverthresholdshouldbesetslightlyweakerthanMinimumusablesignallevel选项：A、正确B、错误正确答案:【错误】5、问题：InanN-cellreusepattern,Ncanchooseanypositivenumber.选项：A、正确B、错误正确答案:【错误】6、问题：Asmallvalueoftheco-channelreuseratioprovideslargercapacity.选项：A、正确B、错误正确答案:【正确】7、问题：Cellularradiosystemsrelyontrunkingtoaccommodatealargenumberofusersinalimitedradiospectrum.选项：A、正确B、错误正确答案:【正确】8、问题：Aradiochannelthatisoccupiedfor20minutesduringanhourcarriers20Erlangsoftraffic.选项：A、正确B、错误正确答案:【错误】9、问题：Cellsplittingisusedinhighdensitysubscriberareastodecreasesystemcapacity.选项：A、正确B、错误正确答案:【错误】10、问题：Sectoringhasthecapabilityofdecreasingtheco-channelinterferenceandthusincreasingsystemperformance.选项：A、正确B、错误正确答案:【正确】MobileRadioPropagation:Large-ScalePathLossMobileRadioPropagation:Large-ScalePathLoss1、问题：Theeffectiveradiatedpowerdenotesthemaximumradiatedpowerascomparedtothe___.选项：A、isotropicantennaB、monopoleantennaC、half-wavedipoleantennaD、parabolicantenna正确答案:【half-wavedipoleantenna】2、问题：Thegrowthrateofthepathlossinfreespaceis___.选项：A、1dB/decadeB、10dB/decadeC、20dB/decadeD、100dB/decade正确答案:【20dB/decade】3、问题：___occurswhenapropagatingwaveimpingesuponanobjectwhichhasverylargedimensionswhencomparedtothewavelengthofthewave.选项：A、ReflectionB、DiffractionC、ScatteringD、Reflectionordiffraction正确答案:【Reflection】4、问题：TheQ-functionisdeterminedbythefactorsexceptthe___ofthereceivedsignal.选项：A、thresholdlevelB、averagepowerC、coverageareaD、standarddeviation正确答案:【coveragearea】5、问题：Infreespace,thereceivedpowerisproportionaltothecarrierwavelength.选项：A、正确B、错误正确答案:【正确】6、问题：Thepathlossrepresentssignalgainasapositivedifferencebetweentheeffectivetransmittedpowerandthereceivedpower.选项：A、正确B、错误正确答案:【错误】7、问题：Whenthemediumconsistsofalargenumberofobjectswithdimensionsthataresmallcomparedtothewavelength,scatteringwavecanbeobserved.选项：A、正确B、错误正确答案:【正确】8、问题：Theclose-inreferencedistance,thepathlossexponentandthestandarddeviationstatisticallydescribethepathlossmodelconsideringrandomshadowingeffects.选项：A、正确B、错误正确答案:【正确】Small-ScaleFadingandMultipath,andIntroductionofMIMOTechnologiesSmall-ScaleFadingandMultipath,andIntroductionofMIMOTechnologies1、问题：Fadingcanbeclassifiedintosmallscalefadingandlargescalefading.选项：A、正确B、错误正确答案:【正确】2、问题：Small-scalefadesarecharacterizedbydeepandslowamplitudefluctuationswhichoccurasthemobilemovesoverdistancesofjustafewwavelengths.选项：A、正确B、错误正确答案:【错误】3、问题：Whatisfrequencyflatfading?Atypeofsmallscalefadingwherefrequencysignalcomponentsexperiencedifferentmagnitudesoffading.选项：A、正确B、错误正确答案:【错误】4、问题：Iftheattenuationandpathdelayofacomplexchannelresponsevarywithfrequency,thechanneliscalledatime-variantcomplexchannel.选项：A、正确B、错误正确答案:【错误】5、问题：Forsimulatingafrequencyselectivechannel,discrete-timeTDLfiltersismandatorytohaveN=1whileNisthenumbertapsofthefilter.选项：A、正确B、错误正确答案:【错误】6、问题：TherearemanydiversitymethodstorealizeIndependentfadingpaths,suchasSpaceDiversity,PolarizationDiversity,Frequencydiversityandtimediversity.选项：A、正确B、错误正确答案:【正确】7、问题：SmallScaleFadingisdividedintotwomain,i.e.,multipathdelayspreadandfrequencyspread.选项：A、正确B、错误正确答案:【错误】8、问题：MIMOstandsfor‘MultipleInput,MultipleOutput’,andisaformofradioantennathatincreasesefficiencybyincreasingthenumberoftransmittersandreceivers.选项：A、正确B、错误正确答案:【正确】9、问题：MIMOcapacityisindependentonpropagationchannel.选项：A、正确B、错误正确答案:【错误】10、问题：ForabadMIMOchannels,spatialcorrelationishighandthecapacityislow.选项：A、正确B、错误正确答案:【正确】MultipleAccessTechniquesforWirelessCommunicationsMultipleAccessTechniquesforWirelessCommunications1、问题：CDMAusesthepowercontroltocombatthe.选项：A、self-jammingB、near-farproblemC、multi-userinterferenceD、noiseinterference正确答案:【near-farproblem】2、问题：Whichsystemneedstheequalization?选项：A、OFDMAB、FDMAC、CDMAD、TDMA正确答案:【TDMA】3、问题：WhichisthefeatureofslottedAloha?选项：A、Timeisdividedintoequaltimeslots.B、Transmitonlyatthebeginningofatimeslot.C、Avoidpartialcollisions.D、Increasedelay,andrequiresynchronization.正确答案:【Timeisdividedintoequaltimeslots.#Transmitonlyatthebeginningofatimeslot.#Avoidpartialcollisions.#Increasedelay,andrequiresynchronization.】4、问题：WhicharefeaturesoftheCDMAsystem?选项：A、SofthandoffB、near-farproblemC、self-jammingandsoftcapacitylimitD、RAKEreceiver正确答案:【Softhandoff#near-farproblem#self-jammingandsoftcapacitylimit#RAKEreceiver】5、问题：_____and____canimprovethecapacityofCDMAsystem.选项：A、AntennaSectorizationB、CellsplittingC、VoiceactivityD、Coveragezoom正确答案:【AntennaSectorization#Voiceactivity】6、问题：ThereareTDMA/TDDandTDMA/FDD.选项：A、正确B、错误正确答案:【正确】7、问题：CDMAissuperiortoTDMAandFDMA.选项：A、正确B、错误正确答案:【错误】8、问题：Spreadspectrumlowersthesignalleverandreducesthebandwidthofchannel.选项：A、正确B、错误正确答案:【错误】9、问题：ThevulnerableperiodinpureAlohaistwopackets,andthevulnerableperiodinslottedAlohaisapacket.选项：A、正确B、错误正确答案:【正确】10、问题：ThecapacityofFDMAandTDMAsystemisinterferencelimit