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ID:40103895
大小:1.24 MB
页数:9页
时间:2019-07-21
《THE HISTORY OF ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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