通信原理实验报告BPSK传输系统.docx

通信原理实验报告BPSK传输系统.docx

《通信原理实验报告BPSK传输系统.docx》由会员分享，可在线阅读，更多相关《通信原理实验报告BPSK传输系统.docx（14页珍藏版）》请在冰豆网上搜索。

通信原理实验报告BPSK传输系统

Name：

StudentID：

Class：

WeekThursday

Testname：

BPSKTransmissionsystem

A.Thepurposeoftheexperiment

1.

2.

3.

4.

5.

6.

B.Theexperimentalinstrument

7.

8.

C.Theexperimentcontent

（A）BPSKModulation

BPSKModulationBasebandsignaleyetesting

（1）Nomatchingfilter,theinputofMsequences

♦transmitterclock（TPM01），Transmitsignaleyepattern（TPi03）

Fromtheoscilloscopecanbeseenintheeye,becausetheMsequenceisrandomsignal.

9.TheIbranchandQbranchin-phaseorthogonalmodulationsignalphaseplanevectortest

♦IAccessRd（TPi03），QAccessRd（TPi04），Lissajousfigure

Thetwosignalsarethesame,sotheLissajousfigureisaslopeof1straightlines.

10.BPSKMeasurementofmodulationsignalof0/πphasereversalpoin

♦Themodulatedsignaloutput（TPK03），Modulationreferencecarrier（TPK07）

Ascanbeseenfromtheoscilloscope,themodulatedsignaliszero,andthemodulatedreferencecarrierphase;zeroright,modulatedsignalandthemodulatedcarrierreferencephase.

11.BPSKObservationofmodulatedsignalenvelope

（1）0/1Codeasthemodulationinputdata

♦Themodulatedsignaloutput（TPK03），Themodulatedsignal（TPi03）

0/1codeasthemodulationoftheinputdata,themodulatedsignalenvelopeandthesamemodulationsignalenvelope

（2）Specialcodeasthemodulationinputdata

♦Themodulatedsignaloutput（TPK03），Themodulatedsignal（TPi03）

Specialcodeasthemodulationoftheinputdata,themodulatedsignalenvelopeandthesamemodulationsignalenvelope

（B）BPSKDemodulation

1.Thereceiverdemodulatoreyesignalobservation

（1）Establishmentofintermediatefrequencychannel,

♦Transmitterclock（TPM01），IAccessRd（TPJ05）

Observationonthereceivingendofeyediagram,theeyelidsthick,notsendinggoodquality.

♦Transmitterclock（TPM01），QAccessRd（TPJ06）

QThebranchhasnosignal

2.Demodulatorlossobservedeyesignallock

♦Transmitterclock（TPM01），IAccessRd（TPJ05）

Lossoflock,Isignalisnotclear

♦Transmitterclock（TPM01），QAccessRd（TPJ06）

Lossoflock,Qsignalisnotclear

3.Thephaseplanewavetestreceiverin-phaseIbranchandQbranchoforthogonalsignaldemodulation

♦IAccessRd（TPJ05），QAccessRd（TPJ06），Lissajousfigure

Theleftinputismsequence,therightinputspecialsequence,Qbranchhasnosignal,sotheLissajousfigureisalinehorizontal,solittledifference.

4.Demodulatorloseslockin-phaseIbranchandQbranchoforthogonaldemodulationsignalphaseplanewavetest.

♦IAccessRd（TPJ05），QAccessRd（TPJ06），Lissajousfigure

Thetwosignalsarerandom,Lissajousfigureisachaoscircle

5.Observationofthesamplingpointsignaldemodulatorbeforejudgment

♦Samplingdecisionpoint（TPN04）

Althoughthereisnoise,butjudgingfrom0codeand1code.

6.Demodulatorloseslockdecisionwasobservedbeforethesamplingsignal

♦Samplingdecisionpoint（TPN04）

Lossoflockcannotbejudgedfor0yardsand1yards,theoscilloscopeandcannotdistinguishbetweenthetwolevel.

7.Differentialcodingsignaltest

♦Transmitdatasignaltestpoint（TPM02），Thedifferentialdatasignaloutputcodingtestpoint（TPM03）

Anoscilloscopeisbk-1=[10100011010]

Belowak=[11100101110]

Inaccordancewithak=bk⊕bk-1

8.Thedemodulateddataobservation

（1）Usingdifferentialencoding

♦Transmitdatasignaltestpoint（TPM02），Thereceiveddatasignaltestpoint（TPM04）

Receivedatadelay,butthein-phaseandthesendingend

（2）Continuouspressconfirmkey

♦Transmitdatasignaltestpoint（TPM02），Thereceiveddatasignaltestpoint（TPM04）

Receivedatadelay,presstheOKbuttonaftereachlockandthesendingendareinphase,thedifferentialcodingcanresolvethephaseambiguityproblem.

9.Demodulatorcoherentcarrierobservation

（1）Theinputisaspecialsequencecode

♦Originatingcarriermodulation（TPK07），Coherentcarrierreceiverextract（TPLZ07）

Coherentcarrierandmodulationofthesamecarrierfrequency,phaseerrorisverysmall.

（2）Theloopisoutoflock

♦Originatingcarriermodulation（TPK07），Coherentcarrierreceiverextract（TPLZ07）

Theloopisoutoflock,cannotbecoherentcarrier.

（3）Disconnectifconnectioncircuit

♦Originatingcarriermodulation（TPK07），Coherentcarrierreceiverextract（TPLZ07）

Noinputsignal,demodulationcarrierandtheoriginatordoesnotsync.

10.Demodulatorcoherentcarrierphaseambiguitytest

♦Originatingcarriermodulation（TPK07），Coherentcarrierreceiverextract（TPLZ07），Repeateddisconnectcable

Thefirstcarrierandstartphase,secondtimesandthirdtimesofcarrierandoriginatingRP.BecauseitisBPSK,thecarrierphaseambiguitymaybethetwophase,thetwophasedifferenceof180degrees.

11.Observationdemodulatorcoherentcarrierphaseambiguityeffectsondatademodulation

♦Thereceiveddatasignal（TPJ05），Thetransmissionofdatasignals（TPi03），Repeateddisconnectcable

Thefirstreceivingdataandsendingdatainstead,secondtimestosenddataandreceivedatathesame.Thephaseambiguitymayreceivedataarereversed.

12.Demodulatorpositioningsignalrecoveryobservedwithnonlockingstateofthelock

♦Transmitterclock（TPM01），Receivingtheextractedclock（TPMZ07）

Inadditiontotheclocksignalextraction

♦Transmitterclock（TPM01），Receivingtheextractedclock（TPMZ07），Continuouspressconfirmkey

Receiveclocksignalphasedidnotchange,becausethereisaphaselockedloop,soaverysmallvalueoffixedphase.

♦Transmitterclock（TPM01），Receivingtheextractedclock（TPMZ07），Disconnectcable

Receiveclocksignalphasechange,noinputsignal,isnotacoherentcarrier,sodoesnotextractaclocksignal,receiveclocksignalphaseisrandom.

13.Observationdemodulatorbittimingsignalphasejitter

♦Transmitterclock（TPM01），Receivingtheextractedclock（TPMZ07）

Canobservetheclockjitter,clockjitterisverysmall,probablyinthe0.03UI

D.Question

1.

♦

♦

♦

♦

♦

♦

♦

4.

5.