CDMA Radio Design Principles CDMA无线设计原理 CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 1 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles CDMA 无线设计原理 CDMA Radio Design Principles
Topics主题 Coverage(覆盖) Reverse and forward link 反向和前向链路 A CDMA Link Budget(CDMA链路预算) Capacity(容量) Reverse and forward link capacity 反向和前向链路容量 Search Windows(搜索窗口) № etwork Dimensioning(网络规模) · Carriers(载波) · Channe|E| ements(信道单元) CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 2 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Topics 主 题 Coverage （覆盖） • Reverse and Forward link 反向和前向链路 A CDMA Link Budget （CDMA 链路预算） Capacity （容量） • Reverse and forward link capacity 反向和前向链路容量 Search Windows （搜索窗口） Network Dimensioning （网络规模） • Carriers （载波） • Channel Elements （信道单元）
Part 1 Coverage 第1部分覆盖 CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 3 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Part 1 Coverage 第 1 部分 覆盖
Coverage Analysis 覆盖研究 Forward link Reverse Link 前向链路 反向链路 Relative Fwd Powers 相对前向功率 Idle mode Traffic mode Traffic Channel Access Pilot Coverage Traffic Pilot Coverage Coverage Channel Channel 空闲模式 业务模式 业务信道 导频覆盖 导频覆盖 覆盖 接入信道 业务信道 CDMA coverage analysis has many dimensions CDMA覆盖研究具有许多方面 CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 4 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Coverage Analysis 覆盖研究 CDMA coverage analysis has many dimensions CDMA 覆盖研究具有许多方面 Idle Mode Pilot Coverage 空闲模式 导频覆盖 Traffic Channel Coverage 业务信道 覆盖 Forward Link 前向链路 Relative Fwd Powers 相对前向功率 Traffic mode Pilot Coverage 业务模式 导频覆盖 Traffic Channel 业务信道 Reverse Link 反向链路 Access Channel 接入信道
Coverage Analysis 覆盖研究 Forward Link Reverse Link 前向链路 反向链路 Relative Fwd Powers 相对前向功率 Idle mode Traffic mode Traffic Channel Access Pilot Coverage Pilot Coverage Coverage 空闲模式 业务模式 业务信道 Channel Channel 导频覆盖 导频覆盖 覆盖 接入信道 业务信道 CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 5 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Coverage Analysis 覆盖研究 Idle Mode Pilot Coverage 空闲模式 导频覆盖 Traffic Channel Coverage 业务信道 覆盖 Forward Link 前向链路 Relative Fwd Powers 相对前向功率 Traffic mode Pilot Coverage 业务模式 导频覆盖 Traffic Channel 业务信道 Reverse Link 反向链路 Access Channel 接入信道
Traffic Channel Reverse Link Equation 业务信道反向链路均衡 Eb/l4 at the bts receiver(BTS接收机的E/t): E P/Rb N +(+L/W P/R +1.,HAF:1+m1m VaF Voice activity Factor(typically 0. 4 to 0.5) VAF=话音激活因子(通常为04到05) Assume(假设) perfect power control(完全功率控制) ·Eb/l1=T, Isc =(N-1)P Solve for p(解答Pn) CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 6 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Traffic Channel Reverse Link Equation 业务信道反向链路均衡 Eb/It at the BTS receiver（BTS 接收机的 Eb/It ）： ( ) W I I N I VAF P R N I I W P R I E s c o c o s c r x b o s c o c r x b t b 1 / / / / + + = + + = VAF = Voice Activity Factor (typically 0.4 to 0.5) VAF = 话音激活因子 (通常为 0.4 到 0.5) Assume （假设） • perfect power control （完全功率控制） • Eb/It = G, • Isc = (Nu -1)Prx Solve for Prx （解答 Prx）
Reverse Link Equation反向链路均衡 Received full- rate Power per user: 每个用户接收到的全速率功率: F·NW W/R-TVAF (N2-1) W/R= spreading ratio(128 for evrc)W/R=扩展比率(128 for evrc) I= required eb/N。(typ.7dB)(I=要求的Eb/N(typ.7dB) N= number of simultaneous users(Nu=同时作用的用户数量) VAF mean voice activity factor(typ 0.45 VAF=平均话音激活因子(通常为045 N。W= total equivalent noise at the bts(N。W=BTS上等价噪声的总和) CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 7 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Reverse Link Equation 反向链路均衡 Received full-rate Power per user: 每个用户接收到的全速率功率： •W/R = spreading ratio (128 for EVRC) W/R = 扩展比率 (128 for EVRC) •F = Isc/(Isc+Ioc) •G= required Eb /No (typ. 7 dB) （ G = 要求的 Eb /No (typ. 7 dB)) •Nu = number of simultaneous users (Nu =同时作用的用户数量) •VAF = mean voice activity factor (typ 0.45) VAF = 平均话音激活因子 (通常为 0.45) •NoW = total equivalent noise at the BTS (NoW = BTS 上等价噪声的总和) ( −1) G − G = u o r x N F VAF W R N W P
Reverse Link Interference 反向链路干扰 Reverse link interference comes from in -cell F and out-of-cell mobiles +1 来自于进小区和出小区移动台的反向链路 SC 干扰 In-cell mobiles are power controlled by the BTS 进小区移 动台由BTS进行功率控制 Out-of-cell mobiles are power controlled by other bts 出小区移动台由其他BTS进行功率控制 nterference comes from a large number of distributed mobiles 干扰来自于许多分布式移动台 CDMA Technology and Side《# CDMA Radio Design Principles Telstra 2001 Telstra Operations for Unicom Senior Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 8 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Reverse Link Interference 反向链路干扰 Ioc I sc • Reverse link interference comes from in-cell and out-of-cell mobiles 来自于进小区和出小区移动台的反向链路 干扰 • In-cell mobiles are power controlled by the BTS 进小区移 动台由BTS 进行功率控制 • Out-of-cell mobiles are power controlled by other BTS 出小区移动台由其他BTS进行功率控制 • Interference comes from a large number of distributed mobiles 干扰来自于许多分布式移动台 sc oc sc I I I F + =
Total Receive power 总接收功率 Total Receive power includes in-cell and out-of-cell interference, plus thermal noise 总接收功率包括进小区和出小区干扰,加上热噪声 total NW+1+ =NW+/F F·VAF·N./F NW1+ 等式1 W/R F·VAF·(Nn 噪声增益 CDMA Technology and Side《# Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Telstra Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 9 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Total Receive Power 总接收功率 Total Receive power includes in-cell and out-of-cell interference, plus thermal noise 总接收功率包括进小区和出小区干扰， 加上热噪声 G − − G = + = + = + + F VAF N W R VAF N F N W N W I F P N W I I u u o o s c o s c o c total r x ( 1) / 1 / Noise Rise 噪声增益 等式 1
Example 实例 Assume(假设): F=066,VAF=04,W/R=128 W=1.25 MHZ, R=9.6 kbps NoW=ktb FBts =-174 dBm/Hz +10log(1250000)+4 dB=-109 dBm -850 -90.0 Prx 950+101dBm Ptotal 100.0 9 7 d Bm g-1050 1101149 Reverse link -115.0 112.1 125.0 130.0 0 10 CDMA Technology and Side《# Telstra Operations for Unicom Senior CDMA Radio Design Principles Telstra 2001 Managers Telstra in confidence Making life easier
Advanced Learning Solutions Slide No. 10 Slide ‹#› Telstra © 2001 Telstra in confidence CDMA Technology and Operations for Unicom Senior Managers CDMA Radio Design Principles Example 实例 Assume （假设）： F = 0.66, VAF = 0.4, W/R = 128 W = 1.25 MHz, R = 9.6 kbps NoW = k T B FBTS = -174 dBm/Hz + 10log(1250000) + 4 dB = -109 dBm -114.9 -112.1 -97 dBm -101 dBm -130.0 -125.0 -120.0 -115.0 -110.0 -105.0 -100.0 -95.0 -90.0 -85.0 -80.0 0 10 20 30 40 50 N dBm Prx Ptotal