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1、衅鹃朗鼾孓守仝悫浚印附录B外文文献及译文垦砂铆勾底狗蹦珩骶动芦坞邪匾值椿塍禄怖巳Spectralefficiencyofasingle-cellmulti-carrier阽赛勒鸿獍朔坎塾礁嘉DS-CDMAsysteminRayleighfading幌便藏嘹鲁洹鸱踣毯苘P.Varzakas,G.S.Tombras从反涸铳守赓哺摞斋欣LaboratoryofElectronics,DepartmentofPhysics,UniversityofAthens,GR-15784Athens,Greece
2、弗密庖繁泷叶癖扁侣抬Received8June2005;receivedinrevisedform12September2005;accepted11March2006氐燔懔狄燔睡摔娓折匿钔从嗵阕滂菹曜铫九鸢Abstract:Thespectralefficiencyofamulti-carrierdirect-sequencecode-divisionmultiple-access(MC/DSCDMA)systemoperatinginaRayleighfadingenvironmentisi
3、nvestigatedandevaluatedintermsofthetheoreticallyachievablechannelcapacity(intheShannonsense)peruser,estimatedinanaveragesense.。Thisshortpapercoversoperationoftheconsideredsystemoverbroadcastcommunicationrandomlytime-varyingchannelsasapplicabletowirel
4、essradionetworksandsingle-cellindoormobilesystemsandleadstothederivationofaclosed-formexpressionfortheachievedspectralefficiency.Furthermore,therelationbetweenthenumberoftheemployedsub-carriersandtheachievedspectralefficiencyisrevealed.骺简怯钓炀兼雕揖顺茅訇髹渌癍
5、肴僚刃趴蝴及Keywords:Spectralefficiency;Channelcapacity;Multi-carriermodulation;Code-divisionmultipleaccess;Rayleighfading;嫂啊衣铕薪阃樾精饮哥迟喻游漕郗星肫形杪搽1.Introduction烨吞取锤吗室爝壑拟刽Basedonorthogonalfrequency-divisionmultiplexing(OFDM),multi-carrierdirectsequencecode-div
6、isionmultiple-access(MC/DS-CDMA)hasbeenproposedandinvestigatedinthecontextofhighdataratecommunicationovertime-variantchannels[1].InsuchaMC/DS-CDMAsystem,thedatasequence,multipliedbyaspreadingsequence,modulatesasetofNorthogonalfrequencycarriersrathert
7、hanasingleone,asitisthecaseinconventionalDS-CDMA.Inthispaper,weconsidertheoperationofasingle-cellMC/DS-CDMAsysteminaRayleighfadingenvironmentandevaluateitsspectralefficiencyintermsofthetheoreticallyachievablechannelcapacity(intheShannonsense)peruser,
8、ontheconditionthatthisisestimatedinanaveragesense.Suchanapproachisjustifiedbythefactthatthespectralefficiencyachievedbyanymultipleaccesscommunicationsystemdependsonthephysicalmodelofthefadingradioenvironment,i.e.,onwhatisknownabouttheparticularfading
