CDMA系統(tǒng)設(shè)計與優(yōu)化

第1章 簡介 1                   
                   
 第2章 CDMA概述 4                   
 2.1 概念 4                   
 2.2 特點 4                   
 2.2.1 容量 5                   
 2.2.2 功率控制 6                   
 2.2.3 軟切換 6                   
 2.2.4 話音激活 6                   
                   
 第3章 頻譜指配 8                   
 3.1 頻譜指配與信道編號 8                   
 3.2 信道可用性 9                   
 3.3 優(yōu)選信道 10                   
 3.4 系統(tǒng)內(nèi)頻率規(guī)劃 11                   
 3.5 系統(tǒng)間頻率規(guī)劃 11                   
                   
 第4章 導(dǎo)頻分配 14                   
 4.1 導(dǎo)頻信道模型 14                   
 4.2 移動臺呼叫處理 16                   
 4.3 PILOT-INC與相位偏置的重用 16                   
 4.3.1 導(dǎo)頻分割及PILOT-INC的下界 17                   
 4.3.2 導(dǎo)頻復(fù)用 20                   
 4.3.3 PILOT-INC的上界 23                   
 4.4 相位分配過程 24                   
                   
 第5章 移動臺接入和尋呼 26                   
 5.1 移動臺接入?yún)f(xié)議 26                   
 5.2 接入請求嘗試的平均持續(xù)時延(average persistence delay) 31                   
 5.3 接入信道容量 34                   
 5.3.1 接入信道仿真模型 35                   
 5.3.2 接入信道仿真結(jié)果 36                   
 5.3.3 接入信道容量分析 37                   
 5.4 尋呼信道容量 40                   
 5.4.1 尋呼信道特性 41                   
 5.4.2 假設(shè) 43                   
 5.4.3 尋呼信道容量 44                   
 5.4.1 綜述 50                   
                   
 第6章 切換 52                   
 6.1 硬切換 52                   
 6.2 軟切換和更軟切換 53                   
 6.2.1 定義 53                   
 6.2.2 過程 53                   
 6.2.3 比較 54                   
 6.2.4 性能 55                   
 6.2.5 參數(shù) 61                   
 6.3 載波間的切換 64                   
 6.3.1 孤立小塊區(qū)域系統(tǒng)(pocketed system) 64                   
 6.2 非連貫性區(qū)域的系統(tǒng)(disjoint system) 66                   
                   
 第7章 鏈路預(yù)算 69                   
 7.1 反向鏈路預(yù)算的推導(dǎo) 69                   
 7.1.1 基站天線輸入端所需的功率 69                   
 7.1.2 衰落余量(fading margin) 71                   
 7.1.3 軟切換增益(handoff gain) 75                   
 7.1.4 容許的最大空中路徑損耗 76                   
 7.2 前向鏈路 77                   
                   
 第8章 容量 81                   
 8.1 反向鏈路容量 81                   
 8.2 前向鏈路容量 86                   
                   
 第9章 覆蓋 88                   
 9.1 反向鏈路覆蓋區(qū)域 88                   
 9.2 前向鏈路覆蓋區(qū)域 90                   
 9.3 導(dǎo)頻信道覆蓋概率的推導(dǎo) 102                   
                   
 第10章 業(yè)務(wù)分析 105                   
 10.1 分析 105                   
 10.1.1 兩扇區(qū)情況 106                   
 10.1.2 三扇區(qū)情況 107                   
 10.1.3 K扇區(qū)情況 108                   
 10.2 數(shù)值結(jié)果 108                   
                   
 第11章 天線 111                   
 11.1 天線參數(shù) 111                   
 11.2 天線系統(tǒng)和干擾. 小區(qū)覆蓋 112                   
 11.2.1 方向天線和扇化增益 112                   
 11.2.2 天線高度. 增益和覆蓋區(qū) 113                   
 11.2.3 天線下傾以減少干擾 114                   
 11.3 分集天線系統(tǒng) 115                   
 11.3.1 空間分集天線 116                   
 11.3.2 極化分集天線 116                   
 11.3.3 極化分集和空間分集的比較 118                   
 11.4 多個射頻站點同置時的天線隔離原則 118                   
 11.4.1 介紹 118                   
 11.4.2 互干擾計算的數(shù)學(xué)模型 119                   
 11.4.3 天線隔離標(biāo)準(zhǔn)和安全的天線隔離 121                   
 11.4.4 兩個同置射頻站的天線間隔 123                   
 11.4.5 多個同置射頻站間的互干擾 123                   
 11.4.6 站測量 125                   
                   
 附錄A RF設(shè)計流程 128                   
 A.1 目的 128                   
 A.2 流程概述 128                   
 A.3 預(yù)設(shè)計(preliminary design)階段 128                   
 A.3.1 步驟1：項目計劃和需求評估 130                   
 A.3.2 步驟2：數(shù)據(jù)準(zhǔn)備 130                   
 A.3.3 步驟3：區(qū)域勘察 130                   
 A.3.4 步驟4：地理形態(tài)定義, 移動測試和修正 131                   
 A.3.5 步驟5：驗證覆蓋范圍預(yù)測所用輸入?yún)?shù) 131                   
 A.3.6 步驟6：容量規(guī)劃 132                   
 A.3.7 步驟7：(循環(huán))工程設(shè)計 132                   
 A.3.8 步驟8：確定搜索圈(search rings) 133                   
 A.3.9 步驟9：預(yù)設(shè)計(preliminary design)驗證 133                   
 A.4 最終設(shè)計(Final Design)階段 133                   
 A.4.1 步驟1：選擇候選基站 133                   
 A.4.2 步驟2：候選基站覆蓋范圍的初步評估 135                   
 A.4.3 步驟3：候選站址的移動測試 135                   
 A.4.4 步驟4：移動測試數(shù)據(jù)分析 135                   
 A.4.5 步驟5：更新覆蓋范圍預(yù)測所需參數(shù) 136                   
 A.4.6 步驟6：容量規(guī)劃和業(yè)務(wù)量分析 136                   
 A.4.7 步驟7：RF候選站址選擇以及草案準(zhǔn)備 136                   
 A.4.8 步驟8：創(chuàng)建小區(qū)設(shè)備列表數(shù)據(jù) 138                   
 A.4.9 步驟9：PN規(guī)劃 138                   
 A.4.10 步驟10：生成覆蓋范圍預(yù)測曲線 138                   
                   
 附錄B 射頻優(yōu)化過程概述 139                   
 B.1 小區(qū)分組測試 139                   
 B.1.1 頻譜監(jiān)測 139                   
 B.1.2 基本的呼叫處理測試 140                   
 B.1.3 空載導(dǎo)頻測量 140                   
 B.1.4 加載覆蓋范圍測試 140                   
 B.2 系統(tǒng)范圍的優(yōu)化 141                   
                   
 附錄C 使用CE4進行RF覆蓋預(yù)測 142                   
 C.1 蜂窩工程軟件工具CE4概述 142                   
 C.1.1 工具輸入?yún)?shù)和腳本配置 142                   
 C.1.2 基站放置和參數(shù)設(shè)定 142                   
 C.2 CE4演示版本的功能特點 143                   
 C.2.1 信號強度分析 143                   
 C.2.2 CDMA分析 143                   
 C.3 系統(tǒng)要求及安裝 144                   
 C.4 CE4演示版的局限性 144                   
 C.5 使用CE4軟件包工作 145