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英文原文TransmitDiversitySchemesforcdma-2000DineshRajan,StevenD.GrayAbstract-Transmitdiversityoffersanadvantageintheforwardlinkofthecdma2000systembybalancingthespectrumefficiencyintheuplinkanddownlink.Threeschemesforperformingtransmitdiversityareexaminedinthispaper–orthogonaltransmitdiversitytimeswitchedtransmitdiversityandselectiontransmitdiversityforvehicularindoor-outdoorpedestrianandindoorofficeenvironments.Alsoconsideredaresomeissuesrelatedtoimplementationcomplexityinthemobilehandset.Undercertainchannelconditionsweshowthatlowratefeedbackofantennaselectionandnoforwardlinkpowercontroloffersperformanceadvantagesovertransmitdiversityschemeswithforwardlinkpowercontrolandnoantennaselection.I.INTRODUCTIONThirdGenerationcellularsystemsareexpectedtoprovideincreasedthroughputbothforvoiceandpacketdatatransmission.Toachievethisgoalwemustovercomethelimita...。