无线通信原理（双语）_南京邮电大学中国大学mooc章节课后测试答案期末考试题库2024年.docxVIP

无线通信原理（双语）_南京邮电大学中国大学mooc章节课后测试答案期末考试题库2024年

5GBandshavebeenbroadlydividedintotwocategories:sub-6GHz(FR1)andvisiblelight(FR2).

答案:错误

mMTCof5Gdenotesmassivemachinetypecommunications.

答案:正确

5GdenotestheproposednextmajorphaseofmobiletelecommunicationstandardsbeyondthecurrentLTE-Advancedstandards.Theend-to-endlatencyrequirementin5Gsystemis.

答案:1ms

IntheOFDMA,eachsub-bandhas______sub-carriers.

答案:12

OFDMAisthehybirdofFDMAand.

答案:TDMA

ThecapacityofFDMAandTDMAsystemisinterferencelimited,whilethecapacityofCDMAsystemisbandwidthlimited.

答案:错误

ThevulnerableperiodinpureAlohaistwopackets,andthevulnerableperiodinslottedAlohaisapacket.

答案:正确

Spreadspectrumlowersthesignalleverandreducesthebandwidthofchannel.

答案:错误

CDMAissuperiortoTDMAandFDMA.

答案:错误

ThereareTDMA/TDDandTDMA/FDD.

答案:正确

_____and____canimprovethecapacityofCDMAsystem.

答案:AntennaSectorization_Voiceactivity

WhicharefeaturesoftheCDMAsystem?

答案:near-farproblem_RAKEreceiver_self-jammingandsoftcapacitylimit_Softhandoff

WhichisthefeatureofslottedAloha?

答案:Transmitonlyatthebeginningofatimeslot._Avoidpartialcollisions._Increasedelay,andrequiresynchronization._Timeisdividedintoequaltimeslots.

Whichsystemneedstheequalization?

答案:TDMA

CDMAusesthepowercontroltocombatthe.

答案:near-farproblem

ForabadMIMOchannels,spatialcorrelationishighandthecapacityislow.

答案:正确

MIMOcapacityisindependentonpropagationchannel.

答案:错误

MIMOstandsfor‘MultipleInput,MultipleOutput’,andisaformofradioantennathatincreasesefficiencybyincreasingthenumberoftransmittersandreceivers.

答案:正确

SmallScaleFadingisdividedintotwomain,i.e.,multipathdelayspreadandfrequencyspread.

答案:错误

TherearemanydiversitymethodstorealizeIndependentfadingpaths,suchasSpaceDiversity,PolarizationDiversity,Frequencydiversityandtimediversity.

答案:正确

For