1 of 49MT8820A-E-H-1-(2.00)CDMACDMA基站测试基站测试21 CDMA物理层介绍2 CDMA基站测试项目3 1xEVDO介绍4 EVDO基站测试项目3cdma2000 EvolutionIS-95 IS-95-ATIA/EIA-95- BJ-STD-008 TSB-74cdma20001x Release 0cdma20001x Release Acdma20001x Release Bcdma20001x Release Ccdma20001x Release Dcdma2000 3xcdma2000 1x EV DO (Rev 0)cdma2000 1x EV DO (Rev A)cdma2000 1x EV DO (Rev B)41 CDMA物理层CDMA (Code Division Multiple Access)标准： IS-95A IS-95A/B ：2G移动通信标准也称为 cdmaOne. IS-2000IMT-2000的一种3G通信标准 也被称为cdma2000 1xEV-DO Release 01xEV-DO 被规划用于优化数据传输，最高可支持2.4Mbps 的传输速率，支持 多媒体业务如MP3，video等传输 1xEV-DO Release A1xEV-DO Release 0的升级, CDMA2000 1xEV-DO Rev A 可提供更高数率的上 下行连接，前向最高可达到 3.1 Mbps, 反向最高 1.8 Mbps. Rev A 在载波带宽 不变的情况下（1.25 MHz）也提供了更高的小区容量。5多种RF信道带宽快速前向链路功率控制前向链路发送分集Turbo码技术反向链路相干解调灵活的帧长cdma系统时间多选择的长交织器1 CDMA物理层关键技术6扩频速率(Spreading Rate, SR)SR1: 前向和反向cdma信道在单载波上都是采用码片速率为1.2288Mcps的直接序列扩谱 SR3: 前向信道有3个载波，每个载波的码片速率为1.2288Mcps，反向信道在单载波上采用码片速率为3.6864Mcps的直接序列扩频无线配置(Radio Configuration, RC)RC是指一系列前向或反向业务信道的工作模式，每种RC支持一套数据速率，其差别在于物理信道的各种参数，包括各种调制特性和扩频速率 等无线传输技术(Radio TransmissionTechnology, RTT)1 CDMA物理层7Spreading Rate 1 and Spreading Rate 31 CDMA物理层8CDMA Channel Generation1 CDMA物理层9CDMA Carrier (Cellular Band)1.251.25MHzMHz1.251.25MHzMHzMobile StationMobile StationBase StationBase Station45 45 MHzMHzFrequencyFrequencyCDMACDMA ChannelChannel FrequencyFrequency283283 833.49 833.49 MHzMHz283283 878.49 878.49 MHzMHz1 CDMA物理层10CDMA Carrier (Cellular Band)CDMA CarrierCDMA Carrier3030KHzKHz28328342 42 ChannelsChannels3043042612611 CDMA物理层11CDMA Carrier (PCS Band)1.251.25MHzMHz1.251.25MHzMHzReverseReverse CDMA ChannelCDMA ChannelForwardForward CDMA ChannelCDMA Channel80 80 MHzMHzFrequencyFrequency ChannelChannel FrequencyFrequency2525 1851.25 1851.25 MHzMHz2525 1931.25 1931.25 MHzMHz1 CDMA物理层12CDMA Carrier (PCS Band) CDMA CarrierCDMA Carrier5050KHzKHz2525 25 25 ChannelsChannels1 CDMA物理层13Radio ConfigurationsRadio Configuration: A set of Forward Traffic Channel and Reverse Traffic Channel transmission formats that are characterized by Physical Layer parameters such as transmission rates,modulation characteristics,and spreading ratecdma2000 Radio Configurations: RC1 through RC9 on the Forward link RC1 through RC6 on the Reverse link1 CDMA物理层14Forward Link Radio Configurations1 CDMA物理层15Reverse Link Radio Configurations1 CDMA物理层16快速前向链路功率控制移动台在检测了前向链路的Eb/N0后送出功率控制比特 功率控制比特与反向导频信道复用 功率控制比特不进行编码，避免编码，成帧和解码等造成的时延 功率控制速率是固定的800次/秒1 CDMA物理层17前向链路的发送分集多载波发送分集(MCTD)对于MC方式，不同的天线采用不同的载波 正交发送分集(OTD)对于DS方式，可以通过分离数据流，采用正交序列扩展两个数据流来完 成1 CDMA物理层18Forward Link Channel Function Pilot Channel The most strongest and most obvious signal, about 15% of total power; Provides a phase reference for coherent demodulation; Provides multipath detection for Rake receiver; Provide a means for signal strength comparisons between base stations for determining when to handoff. Diversity Pilot Channel The pilot channel and the发射分集导频信道（ transmit diversity pilot channel） provide phase references for coherent demodulation of forward link CDMA channels which employ transmit diversity. Auxiliary Pilot Channel An auxiliary pilot channel is required for forward link spot beam and antenna beam forming applications, and provides a phase reference for coherent demodulation of those forward link CDMA channels associated with the auxiliary pilot. Transmit Diversity Pilot Channel A transmit diversity pilot channel associated with an auxiliary pilot channel. 1 CDMA物理层19Forward Link Channel FunctionDedicated Control Channel Co-exist with other traffic channels Transmit Upper Layer Signaling, MAC messages, and RLP frames Provides Conduit for messaging instead of Fundamental Channel dim/blank and burstBroadcast Control ChannelBroadcast only overhead messages and SMS messages. removes the overhead messages from paging channel to a separate channelQuick Paging Channel Signal sent by a base station to inform mobile stations operating in the slotted mode during the idle state whether to receive the Paging Channel starting in the next Forward Paging Channel frame.1 CDMA物理层20Forward Link Channel FunctionSync ChannelTransports the synchronization message to the mobile station.Paging Channel Transmission of control information and pages from a base station to mobile stations. Broadcast system messages, channel, and neighbor pilots information to MS 9600 or 4800 bps, 20ms frame durationForward Common Control Channel and Broadcast Control ChannelTransmission of digital control information from a base station to one or more mobile stations.Common Assignment Channel Used by the base station to acknowledge a mobile station accessing the Enhanced Access Channel or Reservation Access Mode.Common Power Control Channel The Common Power Control Channel is used by mobile stations operating in the Power Controlled Access Mode or Reservation Access Mode. 1 CDMA物理层21Reverse Link Channel Function Access ChannelCommon channels used for communication of layer 3 and MAC messages from mobil