ScienTECH ST2115 User manual

CDMATrainer
ST2115
LearningMaterial
Ver.1.2
AnISO9001:2008 company
94, ElectronicComplex, Pardesipura
Indore-452 010India
Tel:[phone]
Fax:[phone]
email: [e-mail]
Websites: www.caddo.bz
www.scientech.bz
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ST2115
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ST2115
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CDMATrainer
ST2115
TableofContents
1. SafetyInstructions4
2. Introduction5
3. Features7
4. TechnicalSpecifications8
5. Theory
•MultipleAccess Techniques9
•TypesofCodeDivisionMultiplexing14
•AdvantagesofAsynchronousCDMA17
•CDMAfeatures19
•Spread-SpectrumCommunicationSystems19
•Direct-Sequence Spread-SpectrumSystems22
•PNSequencesandGenerators25
•ST2115 CDMATrainer- Briefdescription28
6. Experiments
•Experiment131
StudyofDS-SS modulation/DemodulationProcess
•Experiment234
StudyofBPSKModulationandDemodulation
•Experiment337
StudyofPulseWidthModulationandDemodulation
•Experiment440
StudyofCDMA(DS-SS)technique
•Experiment544
StudyofDS-SS usinganalogsignalasaninputsignal
7. FrequentlyAskedQuestions47
8. Warranty50
9. ListofAccessories50
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SafetyInstructions
Readthefollowing safetyinstructionscarefullybeforeoperatingtheinstrument.To
avoidanypersonalinjuryordamagetotheinstrumentoranyproductconnectedtoit.
Donotoperatetheinstrumentifsuspectanydamagetoit.
Theinstrumentshouldbeservicedbyqualifiedpersonnelonly.
Foryoursafety:
UseproperMainscord:Useonlythemainscorddesignedforthisinstrument.
Ensurethatthemainscordissuitableforyour
country.
Ground theInstrument:Thisinstrumentisgroundedthroughtheprotective
earthconductorofthemainscord.Toavoidelectric
shockthegroundingconductormustbeconnectedto
theearthground.Beforemaking connectionstothe
inputterminals,ensurethattheinstrumentisproperly
grounded.
ObserveTerminalRatings: Toavoidfireorshockhazards, observeall ratingsand
marksontheinstrument.
UseonlytheproperFuse:Usethefusetypeandratingspecifiedforthis
instrument.
UseinproperAtmosphere: Pleaserefertooperatingconditionsgiveninthe
manual.
1. Donotoperateinwet/dampconditions.
2. Donotoperateinanexplosiveatmosphere.
3. Keeptheproductdustfree, cleanand dry.
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Introduction
ST2115,CDMATrainer isdesignedtoassiststudentstounderstandthebasic
workingprincipalofCDMAtechnique,specifically,DirectSequence Spread
Spectrumandtounderstanditsusageintoday’scellularsystems.
ST2115,CDMATrainercomprisesoffollowing majorblocks:
•AudioSignalGenerator(0-3.4KHz)
•BinaryDataGenerator
•PNSequence Generator
•DirectSequence spreadspectrumGeneratorandreceiver
•BPSKModulatorandDemodulator
•PulseWidthModulatorandDemodulator
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