低压电力线载波通信信道特性分析

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1、ABSTRACTABSTRACTPowerlinecommunication(PLC)isawayofcommunicationthatusingpowerlineasamediumforvoiceanddatatransmission.Thetechnologyhasbeenwidelyusedbyelectricpowercompanyintheautomaticmanagementinelectricnetwork.However,affectedbyfactorsinpowerlineenvironmentsuchashighno

2、ise,impedancemismatch,transmissionlossandtime-varyingcharacteristics,thedatatransferrateofpowerlinecarrier-currentcommunicationisrestricted.Becauseoflackofsufficientresearch,therestillhavesomeproblemswhichhaveeffectedontheprotocoldevelopmentandtechnologyselection.Thisdiss

3、ertationaimstostudythecharacteristicsoflowvoltagePLCchannel.Settingupthetime-varyingmodelofnoisechannelanddispersivechannelbasedontheparameterswhichgettingfromthetypicalgridenvironmentandelectricalequipment.Providingefficienttoolsforthestudyofchannelcharacteristicsandeval

4、uatingperformanceofsystems.Firstlythedissertationanalyzesthekeyinfluencefactorsofchanneltransmissioncharacteristicbasedonthetransmissiontheory.Thelineattenuation,multipatheffectandthetypicalmultipathmodelofpowerlinechannelareresearched.Thenthespecificmeasurementschemesfor

5、differentchannelparametersareproposed,thetestcircuitsandprogramarecarriedout.Thenoise,signalattenuationandinputimpedanceweremeasured.Accordingtotheanalysisofthesedata,someconclusionsweregiventhatthenoiseamplitudeofsamesamplinginstantobeysthenormaldistributioninACcycleandt

6、hedistributionsofnarrowbanddeclineseemtobethesamewithoutconsideringlineimpedance.Basedontheanalysisofthecollecteddataandtheoreticalderivation,themodelingmethodofpowerlinenoiseandfadingchannelareresearchedindepth.Thepowerlinenoiseareclassifiedintothreecategoriesandthemodel

7、areestablishedwhichrestorethecyclicstationarycharacteristicsofnoise.Accordingtothecharacteristicsthatchannelattenuationisaffectedbyvaryingimpedance,thetime-varyingimpedancemodelsareestablished.Aperiodictime-varyingchannelmodelisputforwardbasedontwo-networktheory.Finally,t

8、hethesisanalyzestheinfluenceofdifferentpowergridenvironmentontransmissioncharacteristicandcapaci