通信原理实验 fsk modulation and demodulation 实验报告

《通信原理实验 fsk modulation and demodulation 实验报告》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、Name：ID：Class：Week:Lesson:Experiment：FSKModulationandDemodulationI、Purpose1.MastertheSoftwareDefinedRadioFSKmodulationanddemodulationprinciple.2.MastertheFSKgeneration,transmissionandrecoveryprocess.3.MasterFSKbasicprincipleandmethodofquadraturemodulation.4.Dee

2、pentheunderstandingofphenomenaandproblemsofFSKmodulationanddemodulation.II、Apparatus1.ZH5001Acommunicationprincipleexperimentsystem2.20MHzdualtraceoscilloscopeIII、ProcedureFSKmodulation1.ObservationofbasebandFSKsignal.(1)Allinputbitsare'1'.¨BasebandFSKsignalobs

3、ervation.(TPI03)Eachgridis10us,acycleof2.8grid,sothecycleis28us.(2)Allinputbitsare'0'.¨ObservationofbasebandFSKwaveformintimedomain.(TPI03)Eachgridis20us,acycleof2.8grid,sothecycleis56us.1.Theoriginatorofthein-phasebranchandthequadraturebranchsignalwaveformobse

4、rvationintimedomain.¨Observationofin-phasebranchandthequadraturebranchsignalwaveformintimedomain.(TPI03)(TPI04)Thephasedifferenceofthetwosignalsisπ/2,thereforetheysatisfyquadraturerelationship.2.Theoriginatorofthein-phasebranchandthequadraturebranchsignalLissaj

5、ouscurveobservation.¨ObservationoftheLissajouscurvewithin-phasebranchwaveformandthequadraturebranchsignal(TPI03)(TPI04)Twosignalswiththesameamplitudequadrature,thereforetheLissajouscurveisacircle.1.ContinuousphasebasebandFSKsignalobservation(1)Theinputbitsare'0

6、''1'alternately.¨ObservationofinputsignalandthebasebandFSKwaveformintimedomain.(TPM02)(TPI03)Whenthebitis'1',thefrequencyofFSKsignalishigh.Whenthebitis'0',thefrequencyofFSKsignalislow.(2)Theinputbitsarespecial¨ObservationofinputsignalandthebasebandFSKwaveformin

7、timedomain.(TPM02)(TPI03)Whenthebitis'1',thefrequencyofFSKsignalishigh.Whenthebitis'0',thefrequencyofFSKsignalislow.1.TheFSKmodulatedIFsignalwaveformobservation(1)Theinputbitsare'0''1'alternately.¨ObservationofinputsignalandtheModulatedoutputsignalwaveformintim

8、edomain.(TPM02)(TPK03)Thelowertraceisasingle-sidebandsignal.(3)OpenthequadraturebranchbyKI01¨ObservationofinputsignalandtheModulatedoutputsignalwaveformintimedomain.(TPM02)(