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1、AbstractAbstractPowerlines,asamediumofbroadbandcommunication,haveattractedincreasinglyattention.Itsfeatureofwidelydistribution,convenientconnectionsandlargechannelcapacity,hasmadeitaneffectivesolutionforbroadbandaccess.Duetothevarietyoflowvoltagedistributionnetworknoise(includingimpulsenoise,nar
2、rowbandinterferenceandbackgroundnoise),thetransmittedsignalssufferedfrequencyfading,andthereflectionandrefractionbetweennodesinthenetworkwillintroducemulti-patheffects.OFDM(orthogonalfrequencydivisionmultiplexing)hasastrongabilityagainstattenuationandinterference.Inlow-voltagepowerlinecommunicat
3、ionsystem,theintroductionofOFDMtechnologycanovercometheeffectofpowerlinechannelmultipath,time-varyingandfrequencyselectivefading;improvestabilityandreliabilityofdatatransmission.Inaddition,noteverypowerlinecommunicationsubchannelisgoodfortransmittingdata,somesubchannelsaregood,andsomearebad,this
4、imbalanceofsubchannelswillaffecttheefficiencyofdatatransmissioninthesystem.Byadoptingsubchannelequivalentoptimization,combinedwithadaptivebitandpowerallocationalgorithm,itcansavesignaling,improvetransmissionefficiency.Thespecificstudyfocusedonthefollowingaspects:(1)Accordingtotheimbalanceofsubch
5、annelfeatures,analysistheequivalentsubchanneloptimizationmodel,adoptingtheoptimizationalgorithmtooptimizethesubchannel,thencombinedwiththebitandpowerallocationalgorithmtoachievefastdistributionofbitandpowerintheequivalentsubchannel.(2)Usingmatlabtosimulateandanalyzetheperformanceofadaptivebitand
6、powerallocationalgorithm,aimatthecertainextentnumberofthebitallocation,adoptingtheequivalentsubchannelalgorithmwillgetbetterperformanceinlow-voltagepowerlinecommunicationsystem.Keywords:low-voltagepowerlinecommunication,orthogonalfrequencydivisionmultiplexing,bitandpowerallocationalgorithm,subch
7、anneloptimizationII万方数据目录目录摘要.....................................................IAbstract..................................................II1绪论....................................................11.1引言....................
