光纤无线通信系统中信号相关噪声信道优化技术研究（英文）-豆柴文库

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光纤无线通信系统中信号相关噪声信道优化技术研究（英文）
Abstract
Fiberopticwirelesscommunicationsystemhasemergedasoneofthemostpromisingtechnologiesinrecentyears.However,oneofthemajorchallengesinthesesystemsissignalcorrelatednoisethatdegradesthequalityofthetransmittedsignals.Thisresearchaimstoinvestigatechanneloptimizationtechniquesthatcanbeimplementedtoreducetheimpactofsignalcorrelatednoiseonthefiberopticwirelesscommunicationsystem.Thepaperprovidesanintroductiontowirelesscommunicationsystemsanddiscussesthesignalcorrelatednoisechannelanditsimpactonthesystemperformance.Theresearchalsoexploresvariousoptimizationtechniquesthatimprovethesystemperformance.Finally,conclusionsandrecommendationsareofferedtoimprovethesignalqualityoffiberopticwirelesscommunicationsystems.
Introduction
Wirelesscommunicationsystemsarebecomingincreasinglypopularinthemoderneraduetotheirincreasedflexibilityandconvenienceovercablingsystems.Wirelesssystemsareparticularlyusefulinenvironmentswherecablingisnotpracticalorfeasible,suchasinmobilenetworks,aerospace,anddefensesystems.However,wirelesschannelsaresusceptibletovarioustypesofinterferenceandnoisethatcandegradethequalityofthetransmittedsignal.Onesuchtypeofnoiseisthesignalcorrelatednoise,whichcanhaveasignificantimpactonsystemperformance,particularlyinfiberopticwirelesscommunicationsystems.
SignalCorrelatedNoiseinFiberOpticWirelessCommunicationSystems
Infiberopticwirelesscommunicationsystems,signalcorrelatednoisecanbecausedbyavarietyoffactors,includingthermalnoise,systemnoise,anddistortionofthetransmittedsignals.Thesignalcorrelatednoiseisalsocommonlyknownasmultipathfading,whichoccursinwirelesssystemsduetoreflections,scattering,anddiffractionofthesignalasitpropagatesthroughthewirelesschannel.
TheeffectsofsignalcorrelatednoiseonfiberopticwirelesscommunicationsystemsincludeincreasedBER(BitErrorRate)anddecreasedsignalquality,whichcanresultinpoorsystemperformance.ThesignalqualityistypicallymeasuredbytheSNR(Signal-to-NoiseRatio)andisaffectedbythesignalcorrelatednoisethroughitseffecto