OPNET管道阶段详解与建模.ppt

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1、TransceiverPipelineandRadioModelingGoalsIntroducetheOPNETTransceiverPipelineCapabilitiesDefaultsModifypipelineShowopennessandextensibilityModelcustomwirelesseffectsOverviewWirelessmodelingoverviewTransceiverpipelinePipelinearchitectureanddefaultstagesLab:Closure-CustomPipelineStatisticBrea

2、kLab:ChannelMatch-DopplerShiftsBreakLab:Power,Inoise,ECC-SignalLockvs.PowerLockConclusionWirelessModelingOverviewWirelesscommunicationsBroadcastmediumCommunicationmorelikelytobeproblematicLessofacontrolledenvironmentthanwirelineWirelesschannelsneedtobecharacterizedappropriatelyModelreal-wo

3、rldchannelbehaviorFrequencies,power,line-of-sight,interference,etc.ChannelcharacteristicsaffecthigherlayerprotocolbehaviorSimulationtoolmustsupportwirelessmodelingNodemobilityCar,ship,aircraft,satellite,etc.Link-budget-analysiscomputationTransceiverPipelineModelspackettransmissionacrosscom

4、municationschannelImplementsphysicallayercharacteristicsDividedintomultiplestagesDeterminesifpacketcanbereceivedTxRxS1S2S3S13...Eachstagemodelsanaspectofthechannel’sbehaviorPacketPipelineStagesSequenceof‘C’or‘C++’proceduresComputesline-of-sight,signalstrength,biterrors,etc.Canindicatepacke

5、tisnotreceivableEachprocedurehasadefinedinterface(prototype)ArgumentistypicallyapacketInformationtypicallyobtainedandstoredasTransmissionDataAttributes(TDA)TransmissionDataAttributes(TDA)ScopeSpecialpacketstorageareasPartofeverypacketCarrynumericalvaluesInteger,ObjectID,floatingpoint,orpoi

6、nterInitializedbykernelatstartoftransmissionReadableduringapacket’slifeWritableonlyinpipelinePurposeCarrypipelineinformationKerneltopipelinestagePipelinestagetokernelBetweenpipelinestagesUser-DefinedPre-DefinedTDATxRxPipelineModelsScopeEachstageusesapipelinemodelStagesarereferencedviaapipe

7、linemodelobjectattributesPoint-to-Point-linkattributesBus-BusattributesRadio-transceiverattributesStagesmustbecompiledpriortoreferenceModelingmethodCreatestageincontextofthepipelinemodelCompilestageintoobjectformChangepipelinemodelobjectattributetoreferencesta