【資料名稱】：中興內(nèi)部資料TD-SCDMA技術(shù)-提高篇

【資料作者】：中興

【資料日期】：20091101

【資料語言】：中文

【資料格式】：DOC

【資料目錄和簡介】：

中興內(nèi)部資料TD-SCDMA技術(shù)-提高篇











內(nèi) 部 資 料
注 意 保 密
目錄
第一章 TD-SCDMA技術(shù)概述.............................................................................................................................1
1.1 第三代移動通信（3G）標(biāo)準(zhǔn).....................................................................................................................1
1.2 3G 工作頻段規(guī)劃.........................................................................................................................................2
1.3 TD-SCDMA 多址方式.................................................................................................................................3
1.4 TD-SCDMA 標(biāo)準(zhǔn)進展?fàn)顩r.........................................................................................................................4
1.4.1 IMT2000 標(biāo)準(zhǔn)化組織結(jié)構(gòu)..................................................................................................................4
1.4.2 3GPP的標(biāo)準(zhǔn)化進展...........................................................................................................................5
1.4.3 TD-SCDMA標(biāo)準(zhǔn)的進展情況.............................................................................................................5
1.5 TD-SCDMA 產(chǎn)業(yè)狀況及開發(fā)計劃.............................................................................................................6
1.6 TD-SCDMA 網(wǎng)絡(luò)架構(gòu).................................................................................................................................7
1.7 TD-SCDMA 系統(tǒng)的一些問題.....................................................................................................................9
1.7.1移動速度與覆蓋................................................................................................................................10
1.7.2干擾問題............................................................................................................................................10
附錄一：TD-SCDMA 與WCDMA 系統(tǒng)的共存干擾問題........................................................................13
附錄二：PHS與WCDMA系統(tǒng)的干擾問題.............................................................................................16
第二章 TD-SCDMA物理層...............................................................................................................................18
第二章 TD-SCDMA物理層...............................................................................................................................18
2.1 TD-SCDMA 物理層概述...........................................................................................................................18
2.1.1多址接入方案....................................................................................................................................18
2.1.2信道編碼方案....................................................................................................................................18
2.1.3調(diào)制和擴頻方案................................................................................................................................18
2.1.4物理層過程........................................................................................................................................18
2.2 TD-SCDMA 物理信道及傳輸信道...........................................................................................................19
2.2.1物理信道............................................................................................................................................19
2.2.2幀結(jié)構(gòu)................................................................................................................................................19
2.2.3時隙結(jié)構(gòu)............................................................................................................................................20
2.2.3.1 下行導(dǎo)頻時隙（DwPTS）.........................................................................................................................20
2.2.3.2 上行導(dǎo)頻時隙（UpPTS）..........................................................................................................................20
2.2.3.3 常規(guī)時隙......................................................................................................................................................20
2.2.4傳輸信道到物理信道的映射............................................................................................................22
2.2.4.1 物理信道......................................................................................................................................................22
2.2.4.2 傳輸信道......................................................................................................................................................23

2.2.5 TD-SCDMA信道編碼及復(fù)用...........................................................................................................26
2.2.5.1 概述..............................................................................................................................................................26
2.2.5.2 CRC差錯檢驗.............................................................................................................................................28
2.2.5.3 傳輸塊的級聯(lián)與碼塊分割..........................................................................................................................28
2.2.5.4 信道編碼......................................................................................................................................................29
2.2.5.5 無線幀尺寸均衡..........................................................................................................................................32
2.2.5.6 第一次交織..................................................................................................................................................32
2.2.5.7 無線幀分段..................................................................................................................................................33
2.2.5.8 速率匹配......................................................................................................................................................33
2.2.5.9 傳輸信道復(fù)用..............................................................................................................................................33
2.2.5.10 物理信道分割............................................................................................................................................34
2.2.5.11 第二次交織................................................................................................................................................34
2.2.5.12 子幀分割....................................................................................................................................................36
2.2.5.13 物理信道映射............................................................................................................................................36
2.2.5.14 不同傳輸信道到一個CCTrCH的復(fù)用以及CCTrCH到物理信道的映射...........................................37
2.2.5.15 傳輸格式檢測............................................................................................................................................38
2.2.6 層 1控制信息的編碼........................................................................................................................39
2.2.6.1 TFCI 的編碼.................................................................................................................................................39
2.2.6.2 TPC的編碼..................................................................................................................................................47
2.2.6.3 SS的編碼.....................................................................................................................................................48
2.2.6.4 PI的編碼及加擾..........................................................................................................................................48
2.2.6.5 FPACH信息位的編碼.................................................................................................................................48
2.2.7信道編碼和復(fù)用舉例........................................................................................................................49
2.2.7.1 BCH傳輸信道..............................................................................................................................................49
2.2.7.2 PCH 和FACH傳輸信道.............................................................................................................................51
2.2.7.3 DCH傳輸信道.............................................................................................................................................52
2.3 TD-SCDMA 擴頻與調(diào)制...........................................................................................................................54
2.3.1數(shù)據(jù)調(diào)制............................................................................................................................................55
2.3.1.1 符號速率與符號周期..................................................................................................................................55
2.3.1.2 數(shù)據(jù)比特到信號星座圖的映射...................................................................................................................55
2.3.2擴頻調(diào)制............................................................................................................................................56
2.3.2.1 基本擴頻參數(shù)..............................................................................................................................................56
2.3.2.2 擴頻碼..........................................................................................................................................................56
2.3.2.3 擾碼..............................................................................................................................................................57
2.3.3同步碼的產(chǎn)生....................................................................................................................................58
2.3.3.1 SYNC_DL碼................................................................................................................................................58
2.3.3.2 SYNC_UL碼................................................................................................................................................58
2.3.4碼分配................................................................................................................................................59
2.4 TD-SCDMA 物理層過程...........................................................................................................................59
2.4.1基站間的同步技術(shù)............................................................................................................................59
2.4.2發(fā)射功率控制....................................................................................................................................60
2.4.2.1 上行控制......................................................................................................................................................60
2.4.2.2 下行控制......................................................................................................................................................61
2.4.3上行同步............................................................................................................................................61
2.4.3.1 UpPCH .........................................................................................................................................................62
2.4.3.2 PRACH.........................................................................................................................................................62
2.4.3.3 DPCH 和PUSCH........................................................................................................................................62
2.4.4小區(qū)搜索過程....................................................................................................................................62
2.4.5隨機接入過程....................................................................................................................................63
2.4.5.1 隨機接入準(zhǔn)備..............................................................................................................................................63
2.4.5.2 隨機接入過程..............................................................................................................................................63
2.4.5.3 隨機接入沖突處理......................................................................................................................................64
2.4.6下行發(fā)射分集....................................................................................................................................65
2.4.6.1 DPCH 的發(fā)射分集.......................................................................................................................................66
2.4.6.2 DwPTS的發(fā)射分集.....................................................................................................................................67
2.4.6.3 P-CCPCH的發(fā)射分集................................................................................................................................67
第三章 TD-SCDMA系統(tǒng)中的關(guān)鍵技術(shù)...........................................................................................................69
3.1 智能天線....................................................................................................................................................69
3.1.1概述....................................................................................................................................................69
3.1.2基本原理............................................................................................................................................69
3.1.3智能天線的主要功能及所應(yīng)考慮的問題........................................................................................71
3.1.3.1 智能天線的主要功能..................................................................................................................................71
3.1.3.2 智能天線所帶來的新問題..........................................................................................................................72
3.2 聯(lián)合檢測....................................................................................................................................................74
3.3 同步 CDMA...............................................................................................................................................78
3.4 接力切換....................................................................................................................................................79
3.5 動態(tài)信道分配............................................................................................................................................85