THE HISTORY OF ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING

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1、LYT-HISTORY-November10/19/0912:42PMPage26HISTORYOFCOMMUNICATIONSEDITEDBYMISCHASCHWARTZINTRODUCTIONTO“THEHISTORYOFOFDM”OFDM,orthogonalfrequency-divisionmultiplexing,playsaauthoritative,historyofthistechnology.Itsauthor,SteveWein-significantroleinmoderntelecommunications,rangingfromitsstein,al

2、eaderintheCommunicationsSocietyandoneofitspastuseinDSL-modemtechnologyto802.11Wi-Fiwirelesssystems.Presidents,wasoneofthepioneersinthedevelopmentofOFDMWorkunderwayinnext-generationmobilewirelesssystemstechnology.HethuswritesfrompersonalexperienceindescribingexploitstheadvantagesofusingOFDMte

3、chniquesaswell.thehistoryofOFDM.WecommendthearticlefollowingtoallOFDMcombinedwithMIMOtechnologyisexpectedtoprovidereadersofIEEECommunicationsMagazine.immenseimprovementsinwirelesstransmissioncapacity.Weare—MischaSchwartzpleasedtohaveforthismonth’sHistoryColumnasuccinct,yetTHEHISTORYOFORTHOGO

4、NALFREQUENCY-DIVISIONMULTIPLEXINGSTEPHENB.WEINSTEINOrthogonalfrequency-divisionmulti-plexing(TDM)ormoredynamictime-workedinthisareaandhadanearlierplexing(OFDM)isoneofthoseideasdivisionmultipleaccess(TDMA),withpatent[3].ThomasEdisonwasalsointhathadbeenbuildingforaverylonguserstakingturnsinusi

5、ngtimeslots,hotpursuitofthemultitonetelegraphtime,andbecameapracticalrealitywasinventedbyBaudot[1]andothers,[4].Theaccessfacilitiesforthesetech-whentheappearanceofmassmarketandwasparticularlyusefulwhentheniquesmightbeconsideredearlyimple-applicationscoincidedwiththeavail-telegraphlinewasunde

6、rutilized,withmentationsofdigitalsubscriberlineabilityofefficientsoftwareandelec-significantgapsbetweencharacters.Of(DSL).However,Bell’sfirstlovewastronictechnologies.Thisarticlecourse,burstspeedwouldbelimitedbytelephony,andhefocusedhisenergydescribesthebackgroundandsomeofintersymbolinterfer

7、ence—thedisper-onanalogvoicetransmissionratherthestrikingearlydevelopmentofsionofapulseintoitsneighbors—forthandiscrete-tonemultiplexedtelegra-OFDM,withexplanationofthemotiva-whichtherewasnotyetagoodchannelphy.tionsforusingit.Ipresumeabroadequalize