xev-do基础介绍（朗讯）

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1、1xEV-DO基础介绍1内容概要EvDO标准介绍信道结构技术特性发起呼叫流程EvDO网络结构简介总结21xEV-DO标准系列空中标准介绍:C.S.0024:cdma2000HighRatePacketDataAirInterfaceStandardsIOS标准:A.S.0001-A:Inter-operabilitySpecification(IOS)forCDMA2000AccessNetworkInterfacesA.S.0007Ver2.0:1xEV-DOInteroperabilityforAccessNetworkInterfacesIP标准:P

2、.S.0001:WirelessIPNetworkStandardTIA/EIA/TSB115:WirelessIPNetworkArchitecturebasedonIETFprotocols其他标准:C.S.0029Ver2.0:TestspecC.S.0032:ANMinimumPerformanceSpecC.S.0033:ATMinimumPerformanceSpec31xEV-DO信道结构1xEV-DOForwardReversePilotMACTrafficControlReverseActivityBitReversePowerContr

3、ol(RPC)TrafficAccessPilotMACDataAckPilotDataReverseRateIndicator(RRI)DataRateControl(DRC)DRCLock4TDM7:1PilotChannel(All0’s)SimplexEncoderCodewordRepetition(Factor=37)PunctureLast3SymbolsSignalPointMapping0+11-1Bi-OrthogonalEncoderCodewordRepetition(Factor=2)SignalPointMapping0+

4、11-1AWalshCoverWi8,i=0,…,7BBitRepetitionFactor=128SignalPointMapping0+11-1CEncoderChannelInterleaverInterleavedPacketRepetitionSignalPointMapping0+11-1DW016=(++++++++++++++++)ACKChannel1BitPerSlotDataChannelPhysicalLayerPacketsDRCSymbolsOne4-BitSymbolPerActiveSlotDRCCoverSymb

5、olsOne3-bitSymbolPerActiveSlotRRISymbolsOne3-BitSymbolPer16–SlotPhysicalLayerPacketW816=(++++++++--------)W48=(++++----)128BinarySymbolsperSlot(Transmittedin½Slot)8BinarySymbolsperActiveSlot16BinarySymbolsperActiveSlot7BinarySymbolsperPhysicalLayerPacket259BinarySymbolsperPhysical

6、LayerPacket256BinarySymbolsperPhysicalLayerPacket128BinarySymbolsperPhysicalLayerPacket1.2288Mcps1.2288Mcps11.2288Mcps1.2288McpsW24=(++--)反向信道结构5前向信道结构CDTDMCDSequenceRepetition/SymbolPuncturingISymbolDEMUX1to1616-aryWalshCoversWalshChannelGain=1/4WalshChipLevelSummer16ChannelsEnco

7、derR=1/3Or1/5ForwardTrafficChannelforControlChannelPhysicalLayerPacketsScramblerChannelInterleaverQPSK/8PSK/16QMModulatorISignalPointMapping0-+11---1WalshCover0IPilotChannel(All0’s)IMACChannelRPCBitsforMACIndexI600*(1-1/DRCLockPeriod)bpsSignalPointMapping0-+11---1RPCChannel

8、GainG(i)WalshChipLevelSummerSigna