cdma2000 1X原理_中国移动通信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1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2码分多址的基本原理码分多址的关键技术CDMA同GSM的比较3•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-417CDMA物理信道Tx:870--880MHzRx:825--835MHz8CDMA首选载波分配SystemDesignatorPreferredSetChannelNumbersA283(Primary)691(Secondary)B384(Primary)777(Secondary)9联通拥有的频率资源825835845CDMATx870880CDMARx960CDMA/DMASpectrumAllocationGSMRx915GSMTxFreq(MHz)93910
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