北京交通大学多天线实验报告.docx
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北京交通大学多天线实验报告.docx
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北京交通大学多天线实验报告
ThisexperimentistouseLabviewandUSRPtpbuild2x2multiple-inputandmultipleoutputsystem.TheprojectistocompletetheSTBCcodinganddecodingforthetransmitofpictureandvideoforaprofoundunderstandingwiththeknowledgeaboutMIMO.
MIMOTransmitPart
1.STU_STBCCoding
ThefunctionofSTU_STBCCoding.viisthatinputaone-dimensionalarrayandinflecttothetwoantennas,turningintoatwo-dimensionalarray.Themoduleisshownasbelow:
Afterfinishingthecoding,wecanprovetheanswerbyinputtingQPSKsymbol:
0.707+0.707i,0.707-0.707i,-0.707-0.707i,-0.707+0.707i,iftheresultisshownasthegraph:
Thepointoftheprocessingistofindthewaytotransmittheinputtingsequenceintotheresultarraywhichisexpected.Wecanbuildfourstatesbyturnaarraywithlengthfour:
x1,x2,x3,x4intotheresultarray:
Tx1andTx2byForcirculation.
Outputx1andx2
Output–x2*andx1*
Outputx3andx4
Output–x4*andx3*
Wecanusethedifferentwaysofcalculationinthecorrespondingtotheeachcomponent.
Toproveiftheansweriscorrect,wejustfellowthestepshownattheinstructor:
Thewholediagramis:
2.MIMOTransmit
AfterputtingtheSTU_STBCcoding.viintotheMIMO.TX.vi,wesawthattheconstellationgraphcouldnotshowthecollectinformation,justfourpointswithoutregular.Wefoundthatwehavemadeaseveremistake,theinformationstreamisaarraywithenormouslengthwhichisunknown,theprogramwecompletedjustcodingthecodesfrontoftheinformationstream.HenceweImprovedthemethodbydividingthesequenceintoquantityofone-dimensionarraywithlength2.
WeusedtheIndexArraytoextracteacharraytocalculate:
ThemoduleofIndexArray
Thenweputthecodex1andx2intothenextdiagramtogetthematrixwithdimension2.
Getthematrix
Makingsureallofthecodeoftheinformationstreamisencoding,thelengthofarrayis2ateachcalculationtime,hencewemustgetthecirculationwiththevalueofthesequencelengthdividedtwo.
WeusedthemoduleoftheArraySizetogetthelengthoftheinformationstreamanddivide2asthetimeofcirculation.
Getthetimeofcirculation
Wemustgetthewholecodinginformationstream,thereforewearesupposedtorecoverthetotalsequence.ThemethodisthatwecanuseeveryarrayaftercodingtoreplacetheinitializearraybyusingthemoduleofReplaceArraySubset,inthisway,canwegetthecodingresultwithoutanyomission.
Recovertheinformationarray
Thewholediagramisshownasbelow:
TheresultonthescreenisthesameastheinstructorafterconnectingUSRP.Unfortunatelytheprintscreenwehavesavedlost.
MIMOReceivePart
1.STU_STBCDecoding
TheprocessofSTU_STBCDecodingisillustratedbythegraphbelow:
WecanusethetransposeHmatrixmultiplybythesymbolmatrixtodecodethesequence.
Ifweinputthesymbolmatrixshownasbelow:
Theprogramiscollectifthesymboloutis:
Justwhatwehaveinputinthemoduleofcoding.
FirstwegettheHmatrixandinverseit:
Secondly,wegetthesymbolmatrixwhichwehaveinputbeforeandmultiplybytheinverseHmatrix.
Aftertransposingtheresultmatrixwewillgetthefinallyanswer.
Toprovetheansweriscorrect,wedidastheinstructorsaid,thuswegettherightconsequence.
2.MIMOReceive
ThemistakewasjustlikethepartofMIMOtransmit.Wemustensurethateverycodeoftheinformationstreamcanberecovered.Thecirculationismustbeusedinthepartofdecoding,whichismuchharderthattheworkhasdonebefore.
Wehopetousethiscirculationtodecodeeacharraywithlengthof2,butthisconnectioniscannotgetthegoodperformance.WearenotabletoimprovetheprojectwithouttheUSRP.
Conculsion
WehavelearnttheknowledgeaboutMIMOfromthe
Indeed,therearesomethingwrongwithmyprogram,theresultisnotveryperfectaswell.ButIamconvincedthatIcanfindtheproblemin-depthstudyinthefuture.
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