臺灣博碩士論文加值系統

本論文以3GPP無線電通道模型為基準，分別針對其系統層通道模型及連接層通道模型二個部分加以改良，建構可反應真實環境之通道模擬器。其中利用統計實際環境之多重路徑生成與消失率，計算實際環境之多重路徑變化率，以此變化率增加了系統層模型中多重路徑抵達角度之時變特性。並藉由量測實際環境之通道脈衝響應，建構可供第三代通訊系統做連接層模擬所需之通道模型資料庫，以增加3GPP連接層通道模型之選擇性，完成了改良式3GPP無線電空-時通道模擬器。並建構寬頻分碼多工存取系統，分析系統在此改良式3GPP通道模擬器下之效能及影響。

In this thesis, a channel simulator has been developed with the aim to present the channel models based on the 3GPP radio channel model, which contains the system-level and link-level, and to describe the methods to modify the channel models. Applying the birth rate and death rate of the multipath in the realistic environment, the system-level channel model is improved by extending the time-variant characteristic of the AOA of the multipath. The database of the channel model is established by measuring the impulse response of the different environments. Thus the selection of the link-level channel models is increased. Finally, the performance of the WCDMA system in the modified simulator is also evaluated. The simulator aims at being used as a simulation platform for 3G wireless communication systems.

目 錄
第一章 緒論 8
1.1 簡介 8
1.2 論文之目的 9
1.3 論文之動機 10
1.4 論文完成之工作及貢獻 11
1.5 論文結構 11
第二章 無線電通道傳播特性之介紹 12
2.1 多重路徑傳播特性之簡介 12
2.2大尺度路徑損失之預估模型 13
2.2.1 Free Space傳播模型 14
2.2.2 Ground Reflection(2-ray)傳播模型 15
2.2.3 Hata模型 16
2.3 小尺度衰落 17
2.3.1 小尺度衰落種類 17
2.3.2 Rayleigh衰落分佈 18
2.3.3 Rician衰落分佈 18
2.3.4 多重路徑之生成與消失 19
第三章 3GPP無線電通道模型之介紹與討論 21
3.1 連接層通道模型之介紹 21
3.2 系統層通道模型之介紹 23
3.2.1 系統層通道模型之建構步驟 23
3.2.2 系統層通道模型之參數定義 25
3.2.3 系統層通道模型之假設 26
3.2.4 系統層通道模型之環境介紹 27
3.3 模擬參數之產生方法與步驟 30
3.3.1 巨細胞環境之模擬參數產生步驟 30
3.3.2 微細胞環境之模擬參數產生步驟 37
3.4 建立通道模型係數 39
3.4.1 非視線波環境之通道係數 39
3.4.2 視線波環境之通道係數 40
3.5 3GPP無線電通道模型之探討 41
第四章 改良式3GPP無線電空-時通道模擬器之建構 42
4.1 量測實際環境之通道脈衝響應 42
4.1.1 通道量測系統之介紹 42
4.1.2量測方法與步驟說明 46
4.1.3量測環境與路徑規劃 47
4.1.4 量測結果分析 48
4.2 3GPP系統層通道模型之改良方法 52
4.2.1 統計實際環境之多重路徑生成與消失率 52
4.2.2 3GPP系統層通道模型之改良 59
4.3建構無線電連接層之通道模型資料庫 62
第五章 第三代WCDMA系統之建構 66
5.1 直接序列展頻 66
5.2 WCDMA之發射機架構 67
5.2.1 發射機之基本架構介紹 67
5.2.2 長虛擬雜訊序列之產生 68
5.2.3 Walsh碼之產生 69
5.2.4 波形產生濾波器 70
5.3 WCDMA之接收機架構 71
5.3.1 接收機之基本架構介紹 71
5.3.2 亂碼擷取 72
5.3.3 亂碼追蹤 73
5.3.4 通道估計 74
5.3.5 Rake接收機 74
5.4 空間分集技術 75
第六章 WCDMA系統在改良式3GPP空—時通道模擬器之效能分析 77
6.1 WCDMA系統之模擬流程介紹 77
6.2 WCDMA系統之連接層模擬結果與分析 78
6.2.1 WCDMA系統在交通大學環境下之連接層模擬結果與分析 78
6.2.2 WCDMA系統在系統層通道模型下之連接層模擬結果與分析 82
第七章 結論 85
參 考 文 獻 86

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