【資料名稱】：無線通信原理.pdf

【資料作者】：無名

【資料日期】：2003.8

【資料語言】：中文

【資料格式】：PDF

【資料目錄和簡介】：

1．無線信道...................................................................1
1．1自由空間無線電波傳播..................................................................................................1
1．2移動通信的電波傳播特點..............................................................................................1
1．3移動通信電波傳播特性..................................................................................................2
1．3．1短期（快）衰落................................................................................................3
1．3．2長期（慢）衰落................................................................................................6
1．3．3衰落特性............................................................................................................6
1．4電波傳播損耗預測模型..................................................................................................6
1．4．1 Okumura-Hata模型............................................................................................7
1．4．2 COST231 Walfisch-Ikegami模型......................................................................9
1．5覆蓋設計........................................................................................................................10
1．5．1傳播模型的選用及修正..................................................................................11
1．5．1基站覆蓋預測..................................................................................................11
1．5．3功率控制..........................................................................................................14
2．分集技術.................................................................15
2．1分集技術的概念............................................................................................................15
2．2分集技術的分類............................................................................................................15
2．3顯分集技術....................................................................................................................15
2．3．1空間分集..........................................................................................................15
2．3．2極化分集..........................................................................................................16
2．4顯分集的合并技術........................................................................................................18
2．4．1信號合并準則..................................................................................................18
2．4．2最大信噪比準則下的信號合并方法..............................................................18
2．5隱分集技術....................................................................................................................19
3．無線通信多址技術.................................................21
3．1 多址技術概述...............................................................................................................21
3．2 頻分多址.......................................................................................................................21
3．3 時分多址.......................................................................................................................22
3．4 碼分多址.......................................................................................................................22
3．5 擴頻技術.......................................................................................................................25
3．6 空分多址.......................................................................................................................27
4．無線通信中的資源分配原理及算法舉例.............31
4．1蜂窩的概念....................................................................................................................31
4．2以GSM為例介紹FCA...................................................................................................31
4．3 PHS無線市話的頻率使用............................................................................................33
4．3．1頻率分配..........................................................................................................33
4．3．2 PHS 頻率指配................................................................................................35
4．4多信道共用技術............................................................................................................35
4．5微蜂窩與信道動態(tài)分配技術........................................................................................38
5．語音編碼技術.........................................................41
5．1概述...............................................................................................................................41
5．2 脈沖編碼調制...............................................................................................................43
5．2．1 脈沖編碼調制（PCM）技術........................................................................43
5．2．2自適應差分脈沖編碼調制(ADPCM).............................................................48
6．PHS通信系統(tǒng)中的基本調制技術..........................51
6．1調制技術概述................................................................................................................51
6．2 π/4-QPSK調制...............................................................................................................52
6．3 衰落和干擾中π/4-DQPSK的性能.............................................................................53
7．天線.........................................................................56
7．1 天線電指標的定義.......................................................................................................56
7．2 天線的高度和間距.......................................................................................................59
7．3 PAS天線選擇.................................................................................................................60
7．4 ZXPCS基站天線說明...................................................................................................62
7．4．1 天線電性能技術指標.....................................................................................62
7．4．2 天線環(huán)境性能指標.........................................................................................63
8．OSI 7層結構簡介...................................................65
8．1物理層............................................................................................................................66
8．2數(shù)據(jù)鏈路層....................................................................................................................67
8．3網(wǎng)絡層............................................................................................................................68
8．4 PHS空中接口協(xié)議棧....................................................................................................69
附錄...............................................................................71
1．雙共技術...........................................................................................................................71
2．單位換算...........................................................................................................................71
3．縮略語...............................................................................................................................72