CDMA原理GNL070主要内容码分多址的基本原理码分多址的关键技术CDMA同GSM的比较GNL070目标不同用户是如何用码区分出来的三种CDMA码的用途CDMA逻辑信道的划分编码,软切换和功率控制GNL070码分多址的基本原理码分多址的关键技术CDMA同GSM的比较GNL070•NUsers/WidebandChannel•C/•Canconsiderdespreadingasthelast"filtering"stage•3Users/NarrowbandChannel•C/(3timeslotsshown)30kHzFrequencyTime•1User/NarrowbandChannel•C/--95 wasaninterimstandarddevelopedbyTIA/-95defined patibilityforthefirst throughtheANSITIA/EIA: municationsIndustriesAssociation/ ElectronicsIndustriesAssociationANSI: AmericanNationalStandardsInstituteIS-DMAIS-95A+workArchitectureCDGIOSCellSiteVoiceControlLInterfaceUNOOMC-RBTSBTSXCIWUMMMSC/VLRCDGIOSPSTNPSTNINApplicationHLRMSCSMSVMSANSI-41GNL070CDMA物理信道Tx:870--880MHzRx:825--835MHzGNL070CDMA首选载波分配SystemDesignatorPreferredSetChannelNumbersA283(Primary)691(Secondary)B384(Primary)777(Secondary)GNL070
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