telcommunications final project report电子毕业设计报告.docx
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telcommunications final project report电子毕业设计报告.docx
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telcommunicationsfinalprojectreport电子毕业设计报告
AnalysisofTelecommunicationSystems
GuoQi
X00097450
BachelorofelectronicEngineering(ORD)
April2015
Supervisinglecturer:
MrDonalO’Toole
HeadofDepartment:
MrJamesWright
DELARATION
Ideclarethatthisreportismyownworkandthatallcontributionsfromotherpeopleandsourcesarereferencedinthebodyofthereportandfullylistedinthereferencessectionattheendofthereport.Iacceptthatpresentingotherpeople’sworkasmyownisaseriousoffenceanditisalsoaseriousbreachoftheInstitute’sregulations.
Studentname:
GuoQiDate:
04/2015
ABSTRACT
TheaimofthisprojectistouseSIMULINKinMATLABtoinvestigatethebehaviorofarangeofTelecommunicationSystems.StudentsareencouragedtoworktogetherinthefirstsemestertolearnhowtouseandapplyvariousSimulinkblockstoconstructandexaminedifferentTelecommunicationSystems,forexamplePSDsforsignalsandnoise,noisegeneration,basebandsignal,eyediagramsandpassbandsignals.InthesecondsemesterareexpectedtoconstructandanalyzevariousTelecommunicationSystemswithindividuallyassignedspecificationssuchasclockrecovery,channelcodesandsoon.
GLOSSARYOFTECHNICALTERMINOLOGY
PSD(PowerSpectralDensity):
PowerSpectralDensitydescribesthepowerperunitareaperunitwavelengthofanillumination.*[1]
PDF(ProbabilityDensityFunction):
isafunctionthatdescribestherelativelikelihoodforthisrandomvariabletotakeonagivenvalue.*[2]
Gaussiannoise:
isstatisticalnoisehavingaprobabilitydensityfunction(PDF)equaltothatofthenormaldistribution,whichisalsoknownastheGaussiandistribution.*[3]
ISI(IntersymbolInterference):
isaformofdistortionofasignalinwhichonesymbolinterfereswithsubsequentsymbols.*[4]
AWGN(AdditiveWhiteGaussianNoise):
isabasicnoisemodelusedinInformationtheorytomimictheeffectofmanyrandomprocessesthatoccurinnature.*[5]
BER(BitErrorRate):
isthenumberofbiterrorsperunittime.*[6]
Jitter:
isthedeviationfromtrueperiodicityofapresumedperiodicsignalinelectronicsandtelecommunications,ofteninrelationtoareferenceclocksource.*[7]
NRZ(Non-Return-To-Zero):
anon-return-to-zero(NRZ)linecodeisabinarycodeinwhich1sarerepresentedusuallybyapositivevoltageand0sarerepresentedusuallybyanegativevoltage,withnootherneutralorrestcondition.*[8]
SNR(Signal-to-noiseratio)isameasureusedinscienceandengineeringthatcomparesthelevelofadesiredsignaltothelevelofbackgroundnoise.*[9]
LPF(low-passfilter)isafilterthatpassessignalswithafrequencylowerthanacertaincutofffrequencyandattenuatessignalswithfrequencieshigherthanthecutofffrequency.*[10]
CHAPTER1:
INTRODUCTION
1.1BACKGROUND
Telecommunicationistouseelectricalsignalsorelectromagneticwavestocommunicateatadistancebytechnologicalmeans.Thewordisoftenusedinitspluralform,telecommunications,becauseitinvolvesmanydifferenttechnologies.
Intelecommunication,acommunicationssystemisacollectionofindividualcommunicationsnetworks,transmissionsystems,relaystations,tributarystations,anddataterminalequipment(DTE)usuallycapableofinterconnectionandinteroperationtoformanintegratedwhole.Thecomponentsofacommunicationssystemserveacommonpurpose,aretechnicallycompatible,usecommonprocedures,respondtocontrols,andoperateinunion.Telecommunicationsisamethodofcommunication(e.g.,forsportsbroadcasting,massmedia,journalism,etc.).Acommunicationssubsystemisafunctionalunitoroperationalassemblythatissmallerthanthelargerassemblyunderconsideration.*[11]
1.2OBJECTIVES
1.Measurementandcalculatesignalandnoisepowerspectraldensities.
2.Generate,transmitanddetectsignalsusingM-arysignalling(AlluseM=4).Useandoptimalreceiver.
3.Usethefollowingchannels:
1)NoisyChannelonly
(2)NoisyandDispersiveChannel.
4.UseBERdetectortodetermineerrors.Presentresultsinasuitabletable.
5.UseM-QAMasanexampleofpassbandmodulation.Provideconstellationplots.
6.PrepareComparisonStudies:
(a)Usingnoisychannelonly:
CompareperformanceofassignedlinecodewithM-aryQAM.
(b)Usingnoisyanddispersivechannel:
Compareperformanceofassignedlinecodetothatofasystemusingraisedcosinepulse.
7.Analysisisincludedwherepossible.UseSimulinkblockstodeterminenoisepowerandsignalpower.UseequationstodetermineerrorprobabilityandcomparetotheBERfromthesimulation.
8.Useeyediagramstoillustratetheeffectoftimingjitter,channelnoiseandchanneldispersion.
9.ImplementSynchronization(ofassignedBasebandsystem)
10.Implementchannelcode(cycliccode)
CHAPTER2:
LITERATUREREVIEW
DigitalCommunicationSystemsUsingMATLABandSimulink,DennisSilage,2009
2.1INTRODUCTION
TheaimofthischapteristointroducethedifferentkindsofblocksinSimulinkwewilluseinMATLABlater.
2.1.1.RandomIntegerGenerator
TheRandomIntegerGeneratorblockisthedatasourcefromtheCommSources,CommunicationsBlocksetwhichproducesrandombinaryintegers(0and1)atadataraterb=1.6kbits/secwhichisgivenasanexampleshowninFigure2.1.1,sothedatabittimecanbecalculatedTb=1/rb=6.25x10-4sec.
Figure2.1.1RandomIntegerGenerator
2.1.2Ratetransition
TheRateTransitionblockfromtheSignalAttributes,SimulinkBlocksetproducesdataatasimulationsampletimeTsimulation=1.25x10-5secwhichisgivenasanexampleshowninFigure2.1.2.Becausethesesignalsaresampledatan80kHZsimulationratewithTb=6.25x10-4sec,eachsignalhas50simulationsamplesperbittimeTb(Wehavealreadyknownrb=1.6kbits/secwhichisgivenasanexample).
ThedataistransferredbyRateTransitionblockfromtheoutputofablockwithoneratetotheinputofablockwithadifferentrate.
Figure2.1.2ratetransition
2.1.3Sum,offsetandGainblock
Theunipolarbinarydata(0and1)isoffsetby-0.5(thisvalueisjustanexample)whichisshowninFigure2.1.3,withtheConstantblockandtheSumblock,andprocessedbytheGainblockfromtheSourceandMathOperations,SimulinkBlocksetwithaparameterofagainG=10(thisvalueisjustanexample)togeneratesignal.Theseblockstransmit100%dutycycle,polarrectangularpulsesandaretheinitialprototypeforPAM.
Figure2.1.3Sum,offsetandGainblock
2.1.4AWGNChannel
AWGN(AdditiveWhiteGaussianNoise)representsthechannelbytheblockfromtheChannels,CommunicationsBlocksetwhichisshowninFigure2.1.4,withtheparameterofvariance
2=5(thisvalueisjustanexample)andmean=0.
Figure2.1.4AWGNChannel
2.1.5SampleandHold
ThesimplePAMreceivershowninFigure2.1.5istheSampleandHoldblockfromtheSignalOperations,SignalProcessingblockset,withtheparameterofarisingedgecontrolsignal.
Figure2.1.5SampleandHoldblock
2.1.6PulseGenerator
APulseGeneratorblockfromtheSources,SimulinkBlocksetisshowninFigure2.1.6,withparametersofaunipolaramplitudeA=0Vor1V,bittimeTb=6.25x10-4sec(thisvalueisjustanexample),apulsewidthof10%Tb=6.25x10-5secandaphasedelayofTb/2=3.125x10-4sec.
Figure2.1.6PulseGenerator
2.1.7Sign
ThedataisinputtedtotheSignblockfromtheMathOperations,SimulinkBlockset,showninFigure2.1.7,whichproducesa1iftheinputislargerthanzero,zeroiftheinputiszeroand-1iftheinputissmallerthanzero.
Figure2.1.7Signblock
2.1.8LookupTable
Theoutput(-1,0,1)ischangedtobinary(-5,5)bytheLookupTableblockfromtheLookupTables,SimulinkBlocksetwhichisshowninFigure2.1.8,withinputvaluesof[-1,0,1]andoutputdataof[-5,-5,5].
Figure2.1.8LookupTable
2.1.9Scopeblock
TheScopeblockfromtheSinks,SimulinkBlocksetisabletodisplaythedatasource,whichisshowninFigure2.1.9.
Figure2.1.9Scope
2.1.10BERcalculationblock
TheErrorRateCalculationblockforbiterrorrate(BER)analysis,showninFigure2.1.10,derivedfromtheCommSinks,CommunicationsBlockset.Parametersaresetwithareceiveddatadelayof1(thisvalueofdelaydependsonyourcircuit)tocompensateforthesimplePAMreceiver.
Figure2.1.10BERcalculationblock
2.1.11LowpassFilter
Figure2.1.11showstheparametersofanAnalogFilterDesignblock.Thisblockprovidesalowpassfilter(LPF),whichisselectedtobea9-poleChebyshevtypeIfilter.Also,wecangetitscutofffrequency
=1.2kHz(1.2xrb,rb=1kHZisjustanexample)andanpassbandrippleof0.1dB(≈1%ripple).TheparametersoftheAnalogFilterDesignblockneedapassbandedgefrequencyinradians/secor2
=2
(1200)rad/sec.
Figure2.1.11LowpassFilter
2.1.12Eyediagramblock
TheEyediagramblockshowninFigure2.1.12derivesfromtheCommSinks,CommunicationsBlockset,whichisabletodisplayarepeatingtimeslice,centeredat1msec,withalengthof2msec.
Figure2.1.12Eyediagram
2.1.13VariableTimeDelayblock
TheVariableTimeDelayblockderivesfromtheContinuous,SimulinkBlockset,whichisshowninFigure2.1.13.TheVariableTimeDelayblockaddstheoutputofthepreviousgeneratorblockasanotherinputwithamaximumdelayof2.5msec(thisvalueisanexample).
Figure2.1.13VariableTimeDelayblock
2.1.14UniformRandomNumberblock
TheuniformRandomNumberblockshowninFigure2.1.14derivesfromtheSources,SimulinkBlockset,withauniformdistributedpdfofamplitudesfromaminimumvalue2x10-5(thisvalueisanexample)toamaximumnumber5x10-4(thisvalueisalso
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