【MOOC】无线通信原理（双语）-南京邮电大学 中国大学慕课MOOC答案

【MOOC】无线通信原理（双语）-南京邮电大学中国大学慕课MOOC答案IntroductiontoWirelessCommunicationsIntroductiontoWirelessCommunications1、【单选题】Ifacarrierfrequencyf=60GHzisadoptedforawirelesscommunication,thewavelengthλofthecarrierwaveis___.本题答案：【5mm】2、【单选题】TheBluetoothsystemsbelongtothewirelessnetworkof___.本题答案：【WPAN】3、【单选题】In2000,ITUapprovedthreestandardsofWCDMA,CDMA2000and___.本题答案：【TD-SCDMA】4、【单选题】Forawirelesscommunicationsystem,iftheinputpoweris8dBm,andtheoutputpoweris5dBm,thesystemattenuationis___.本题答案：【3dB】5、【判断题】Mostcellphonesoperateinthefrequencyrangeof800to2,200KHz.本题答案：【错误】6、【判断题】WIFIisawirelesslocalnetworkthatrunsoftheIEEE802.15standardsset.本题答案：【错误】7、【判断题】Frequencydivisionduplexingsystemusesdifferenttimeslotsfortheforwardandreversechannels.本题答案：【错误】8、【判断题】TheShannoncapacitydeterminesthetheoreticallimitonchannelcapacityforagivenbandwidthandsignal-to-noiseratio.本题答案：【正确】TheCellularConcept:SystemDesignFundamentalsTheCellularConcept:SystemDesignFundamentals1、【判断题】Inthecellularnetworks,thecoverageareaofeachbasestationisnamedascell.本题答案：【正确】2、【判断题】IntheN-Cellreusepattern,thefrequencyreusefactoris1/N.本题答案：【正确】3、【判断题】Inadynamicchannelassignmentstrategy,eachcellisallocatedapredeterminedsetofchannels.本题答案：【错误】4、【判断题】Foraproperhandoffsituation,thehandoverthresholdshouldbesetslightlyweakerthanMinimumusablesignallevel本题答案：【错误】5、【判断题】InanN-cellreusepattern,Ncanchooseanypositivenumber.本题答案：【错误】6、【判断题】Asmallvalueoftheco-channelreuseratioprovideslargercapacity.本题答案：【正确】7、【判断题】Cellularradiosystemsrelyontrunkingtoaccommodatealargenumberofusersinalimitedradiospectrum.本题答案：【正确】8、【判断题】Aradiochannelthatisoccupiedfor20minutesduringanhourcarriers20Erlangsoftraffic.本题答案：【错误】9、【判断题】Cellsplittingisusedinhighdensitysubscriberareastodecreasesystemcapacity.本题答案：【错误】10、【判断题】Sectoringhasthecapabilityofdecreasingtheco-channelinterferenceandthusincreasingsystemperformance.本题答案：【正确】MobileRadioPropagation:Large-ScalePathLossMobileRadioPropagation:Large-ScalePathLoss1、【单选题】Theeffectiveradiatedpowerdenotesthemaximumradiatedpowerascomparedtothe___.本题答案：【half-wavedipoleantenna】2、【单选题】Thegrowthrateofthepathlossinfreespaceis___.本题答案：【20dB/decade】3、【单选题】___occurswhenapropagatingwaveimpingesuponanobjectwhichhasverylargedimensionswhencomparedtothewavelengthofthewave.本题答案：【Reflection】4、【单选题】TheQ-functionisdeterminedbythefactorsexceptthe___ofthereceivedsignal.本题答案：【coveragearea】5、【判断题】Infreespace,thereceivedpowerisproportionaltothecarrierwavelength.本题答案：【正确】6、【判断题】Thepathlossrepresentssignalgainasapositivedifferencebetweentheeffectivetransmittedpowerandthereceivedpower.本题答案：【错误】7、【判断题】Whenthemediumconsistsofalargenumberofobjectswithdimensionsthataresmallcomparedtothewavelength,scatteringwavecanbeobserved.本题答案：【正确】8、【判断题】Theclose-inreferencedistance,thepathlossexponentandthestandarddeviationstatisticallydescribethepathlossmodelconsideringrandomshadowingeffects.本题答案：【正确】Small-ScaleFadingandMultipath,andIntroductionofMIMOTechnologiesSmall-ScaleFadingandMultipath,andIntroductionofMIMOTechnologies1、【判断题】Fadingcanbeclassifiedintosmallscalefadingandlargescalefading.本题答案：【正确】2、【判断题】Small-scalefadesarecharacterizedbydeepandslowamplitudefluctuationswhichoccurasthemobilemovesoverdistancesofjustafewwavelengths.本题答案：【错误】3、【判断题】Whatisfrequencyflatfading?Atypeofsmallscalefadingwherefrequencysignalcomponentsexperiencedifferentmagnitudesoffading.本题答案：【错误】4、【判断题】Iftheattenuationandpathdelayofacomplexchannelresponsevarywithfrequency,thechanneliscalledatime-variantcomplexchannel.本题答案：【错误】5、【判断题】Forsimulatingafrequencyselectivechannel,discrete-timeTDLfiltersismandatorytohaveN=1whileNisthenumbertapsofthefilter.本题答案：【错误】6、【判断题】TherearemanydiversitymethodstorealizeIndependentfadingpaths,suchasSpaceDiversity,PolarizationDiversity,Frequencydiversityandtimediversity.本题答案：【正确】7、【判断题】SmallScaleFadingisdividedintotwomain,i.e.,multipathdelayspreadandfrequencyspread.本题答案：【错误】8、【判断题】MIMOstandsfor‘MultipleInput,MultipleOutput’,andisaformofradioantennathatincreasesefficiencybyincreasingthenumberoftransmittersandreceivers.本题答案：【正确】9、【判断题】MIMOcapacityisindependentonpropagationchannel.本题答案：【错误】10、【判断题】ForabadMIMOchannels,spatialcorrelationishighandthecapacityislow.本题答案：【正确】MultipleAccessTechniquesforWirelessCommunicationsMultipleAccessTechniquesforWirelessCommunications1、【单选题】CDMAusesthepowercontroltocombatthe.本题答案：【near-farproblem】2、【单选题】Whichsystemneedstheequalization?本题答案：【TDMA】3、【多选题】WhichisthefeatureofslottedAloha?本题答案：【Timeisdividedintoequaltimeslots.#Transmitonlyatthebeginningofatimeslot.#Avoidpartialcollisions.#Increasedelay,andrequiresynchronization.】4、【多选题】WhicharefeaturesoftheCDMAsystem?本题答案：【Softhandoff#near-farproblem#self-jammingandsoftcapacitylimit#RAKEreceiver】5、【多选题】_____and____canimprovethecapacityofCDMAsystem.本题答案：【AntennaSectorization#Voiceactivity】6、【判断题】ThereareTDMA/TDDandTDMA/FDD.本题答案：【正确】7、【判断题】CDMAissuperiortoTDMAandFDMA.本题答案：【错误】8、【判断题】Spreadspectrumlowersthesignalleverandreducesthebandwidthofchannel.本题答案：【错误】9、【判断题】ThevulnerableperiodinpureAlohaistwopackets,andthevulnerableperiodinslottedAlohaisapacket.本题答案：【正确】10、【判断题】ThecapacityofFDMAandTDMAsystemisinterferencelimited,whilethecapac