In radio receiving and dispatching DA transformation.docx

In radio receiving and dispatching DA transformation.docx

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InradioreceivinganddispatchingDAtransformation

InradioreceivinganddispatchingD/Atransformation

ItsbasicthoughtistoconstructsaOpentheprogrammablehardwareintypeterraceingeneralusely,passtoaddtocarryhomologoussoftwaremoldpiecetorealizehomologouslead-inBroadcastingstationfunction.Ontheingeneraluseterrace,aslongaschangetherelevantsoftware,cancompleteconvenientlytothebroadcastingstationCanofmodificationandexpand,butneednotdesigntoconstructthehardwareelectriccircuitsystemafresh.SuchradiostationpermitsverymuchRealizeseasilytopermitwithcurrentorfutureandvariousbroadcastingstationconcurrently,utmostsatisfytherequestthatmutualcommunicationwitheachotherconnect.

Cansavetimeofdevelopmentforthebroadcastingstationoflargequantitytorenewwithdevelopthebudgetatthesametime.Thisfirstatcorrespondbyletter（particularlyisatMovethecorrespondence）realmneedhavinggoturgentlywiththeappliedforegroundoftheamplitude.

Thebasicequipmentsofthewirelesscorrespondenceinsideisaradiostation.20centuries780'sesbeginning,alongwithnumber

Thewordhandlestechnicaldevelopmentwithmaturity,traditionalradiostation,solvefromthecontrol,lettersourceletteraplaitofthesystem

Code,hardwaretechniqueetc.realizedinmanywaysandallfromimitatethenumeraltransition.Arithmeticfigureradiostationisfromwholemachine

Theconstructionisallwiththefunctionthanemulationradiostationcontainsubstantialadvance.SomeonestillputsforwardthetotalamountwordreceivesanddispatchTheconceptofthelettermachine,istoactforwiththearithmeticfigureelectriccircuitmostlythebroadcastingstationinside,willimitatethesignalthroughtheA/DAdoptingthekindarithmeticfigureturns,thearithmeticfigureofapplicationhandlesthetechniqueproceedstohandletothesignal,completingtheinformationreceivewithshoot,Thisisthelead-intodelivertheequipmentsinessencealeap.Butthearithmeticfigureradiostationstillexsitsshortage,its

Canofrealizestohavetheverystrongdependencetothehardware,theparticularbroadcastingstationisonlyandcanuseinparticularcorrespondencesystem,Moreover,expandalongwiththecorrespondencebusiness,thenewoldbroadcastingstationpermitsconcurrentlyverydifficult.Therefore,facethelead-inthecorrespondenceVariousthetypeofsystemsofthesysteminside,thetargetthatcurrentradiostationcan'tsatisfyfutureindividualthecorrespondence.

Thesoftwarewirelessemergeswiththetideofthetimes,providingawayofthinkingforresolvingthisproblem.Itregardsoftwareasprinciple,

Butnotdependonthehardwarecharacteristicdirectly,realizethesystemopenthesexstructurally,completelyprogrammable,havebiggestOfvividwithadapttotheability.Thefunctionofthewirelessbedefinedbysoftware,onlychangestoapplyintheingeneraluseplatformLastsoftware,canadjustwiththeworkfrequencythatchangesbroadcastingstation,maketheintermediationmethod,plaitthesolutionthecodemethod,Thevelocitypasstypeofthebusinesscategory,data,encryptthemodeandconnectintocontrolagreementetc..AcquireanyakindofCorrespondencesystem,relaxedrealizeeverykindofcorrespondenceisstandardtopermitconcurrently.Thisisthelead-intechniquetotransferthearithmeticfigurefromtheemulation

Empressofagainoncerevolutionstridesover.

.2technicalcharacteristicsinwirelessinsoftware.Thesoftwarewirelessisaterracetoestablishatanopenthesex,moldpiecetoturntopof,itswantstorealizeeverykindofThefunctioncanpassthesoftwareplaitdistancetorealize,itofbasicconstitutesuchasthefigure1.1show.ThiswillbegthebreadthtakesTheA/DispossiblywiththeD/thetransformationofANofnearradiofrequencyhead.

Themoldfewtransformation（A/D）isanoneofthekeytorealizessoftwarewirelesstechniques.Thistextintroducedtheconceptofthesoftwarewirelessfirst,thenemphasizedtoanalyzetheA/Dtransformationmachinevarioustechniquesindexsign,combinecombinativesolidamethodfor,detailedlydiscussingA/Dadoptingkind.1leadthespeech

Theallandbeautifullongrangesystem（NationalTelesystemsConference）meetingislastin1992May,thecompanyofMitrescientistJoeMitolaattogetherIEEEamemberconversation,putforwardtheconceptofthesoftwarewirelessfirst.Hethinks:

Softwarewirelesssystemaccordingtohardwareterrace,itsA/thetransformationofDshouldasmuchaseverclosetoantenna,butcorrespondbyletterpossiblymanylead-instofunctiontorealizewiththesoftware.Thegeneralconstructionofthesoftwarewirelesssystem,suchasfigure,1show.

Comparewiththetraditionalwirelesssystem,thesoftwarewirelesscarrytoradiofrequencytotakesidetothebesttheA/thetransformationofD,butwillinside（evenradiofrequency）allproceedingsarithmeticfigurewillsturntohandlelateron,theadvantagethathebringisaradiofrequencyheadsmallscaledturning,thecorrespondencefunctionsoftwareturns,thesystemhardwareisingeneralusetoturn.ThefirstsoftwarewirelessisanAmericansolidertoisabroadbandtotakeforthesakeofsolutioneverykindofforusebythemilitarybroadcastingstationacharacteristicsforofmutualcommunicationproblem,softwarewirelessbroadcastingstation,manythesegmentofs,makewaymore,codewaymore,muchnegotiate,smallphysicalvolume,easytogradecreepetc..Forthis,thetotaloffice（ARPA）inplaninresearchinMinistryofNationalDefensehighclassintheUnitedStatesputforwardtheSpeakeasyplans,shouldplanthetargetofthefirststageistoresearchestomanufacturedevelopmentamanymoldsbroadcastingstation（MBMMR）,theSpeakeasyIisfirsttheperioddevelopmentmodel（ADM）tohavedonetoplaytoshowtoalittlebitgovernmentalrepresentativein1994August,heplaytoshowtotallybelowafewcontentses:

（1）differencewiththestandardbroadcastingstationmutualcommunicationof4kindsofgovernmentmaterials,amongthemincludethemilitarytacticsradiostationHaveQuick,HFMODEM（MIL-AsSTD-188-110s）,automaticnetworkestablishtheALE（AsMS-188-141）tocarrythewirelesssystemSINCGARSwithgenuineinsingleletterwiththemachine;

（2）jumpthenettoptoshootatthesametimewiththeSINCGARSattheHaveQuick,realizeatthesametimewiththesetwokindsofbroadcastingstationscorrespondence;

（3）conductandactionsnetbridge/passconjunctionHaveQuickwiththenetofSINCGARS,make2thecustomeronthenetsinformationdeliveredtransparently;

（4）on2Speakeasiesbroadcastingstation,changesatthesametimeaftertheSINCGARSaformparametercanstillmutualcommunication,showedtheprogrammableabilityinaform.

Thistimeplaythecontentsthatshowincludespeech,dataandcalculatorsproduce,andpasstheHFMODEMdeliverofseethepictureof.Shouldplanin1999thedevelopmentofthesecondstageSpeakeasyIIcomplete,heincreasedthenetworkfunctionofthesoftwarewireless,expandedingthebroadcastingstationofMBMMRcanconcurrentlyaformthatpermit,includeGPS,WNA（thelead-innetworkconnectsinto）,beehivetelephoneetc..

Becauseofpastcompareadvantageinsysteminwirelessinsoftware,hewaspaidattentiontobymoreandmorerealms.In1996,wasstartedbytheUnitedStates,alittlebitJapanesecompanytoestablishtheforumofMMITS,aimisinstudydevelopsoftwarelead-intoopreparesoftwarewirelesstechniqueapplytothreegenerationsmovecorrespondbylettersystemIMT-2000,andhavestartedACTS（AdvancedCommunicationTechnologies&Services）etc.plan.

Realizingthesoftwarewirelessincludesbelowafewkeystechnique:

Thebreadthtakestheantennatotakewiththebreadththeradiofrequencymoldpiece,breadthtakesA/thetransformationofD,super-speedDSPmachineanetc..AmongthemA/theDtransformationmachinefunctionqualityaffectsdirectlytoextentthatrealizessoftwarewirelesswiththefunctionindexsignofthesystem,forthisreasonA/itistoproceed?

thatDtransformationmachinechoosetouse

Afunctionfor/Dtransformationmachineparameter

2.1adoptthekindvelocitywithdistinguishtherate

Thekindvelocitythatadoptthevelocitypointsthemoldfewtransformation,butdistinguishtheratiothatratemeantransformationexportationarithmeticfiguredatawiththenumber.This2parametersisveryimportant,becauseadoptthekindvelocityhigherlywithdistinguishtheratetoshouldthehighlettercomparestoinputtotakethebreadthwiththewidesignal.Inthelastfewyears,A/theDmachineafunctionincreasesveryquickly,thesingleistoadoptsthekindvelocityaboutturnovereverytwoyearsatimes.AfewAs/theDmachinepieceadoptsthekindvelocitywithdistinguishtherate,suchastable,1show.

2.2Letterratio

TheletterratioSNR（SignaltoNoiseRatio）pointsthesignaltheallsquareavalueandotherfrequencyweight（donotincludeharmoniouswaveindirectcurrent）allsquareaspecificvalueforofspecificvalue,letterratioSINAD（SignaltoNoiseandDistortion）pointingsignalallsquareavalueandallsquarerootinweight（includeathewaveofbutdonotincludethedirectcurrent）inotherfrequency,soSINADratioSNR?

Ifconsideronlythedealturnsthevoiceof,theletterratioSNRcanmeanfor:

Amongthem:

TheBisanA/Dconversionthemachinedistinguishestherate,thefSisforadoptingthekindvelocity,fmaxfortallestfrequencythatinputthesignal.

Fromtype

（1）therefore,bethefSadoptthekindvelocitysameaswith（Nyquist）velocity,namelyfS=2fmaxes,distinguishtherateeachincrease1bit,thele