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研究生:陳韋宗
研究生(外文):Wei-zong Chen
論文名稱:寬頻分碼多工接取系統中具有干擾消除的細胞搜尋系統
論文名稱(外文):Interference cancellation for cell search in WCDMA
指導教授:李志鵬李志鵬引用關係
指導教授(外文):Chih-Peng Li
學位類別:碩士
校院名稱:國立中山大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:75
中文關鍵詞:細胞搜尋
外文關鍵詞:cell search
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隨著第三代行動通訊系統的推動與實行,各通訊系統間的競爭也越來越激烈,而且第三代行動通訊系統提供各式各樣的服務,所以更好的通訊品質是必要的。本論文針對第三代行動通訊系統之中的W-CDMA討論,研究其系統在多傳送路徑和多細胞訊號中,手機端的細胞搜尋系統改進方法。
因為W-CDMA的細胞搜尋系統在複雜的通道環境之下,會受到通道影響而改變所收到的訊號品質,造成接收時訊號判斷是發生錯誤,導致細胞搜尋時間增長,降低系統的工作效率。因此,我們將原先的細胞搜尋系統中,加入的干擾去除裝置,把通道中的干擾因素去除並增強訊號的強度,因而改進系統的效能,加快手機對訊號的細胞搜尋速度。
The competitions of communication systems are more drastic with the advance and implement of 3G communication systems. Because 3G communication systems can support many serves, it is necessary to provide communication quality. We will discuss the W-CDMA of 3G communication systems in this paper, and research the modify method for cell search on the environment of mutipath or muticell.
Because the cell search will be affected by the communication channel, it will produce the error of received signals, long cell search time and low working efficient. Thus, we propose an interference cancellation in the original system. The proposed system can strengthen the received signal and cancel the interference of signals. It also can reduce the cell search time and accelerate the searching speed.
中文摘要.......................................................................................................................II
英文摘要......................................................................................................................III
書目錄..........................................................................................................................IV
圖目錄..........................................................................................................................VI
表目錄...........................................................................................................................X
第一章 導論..................................................................................................................1
1.1研究動機與方法..............................................................................................1
1.2通訊系統的發展歷史......................................................................................1
1.3細胞搜尋的介紹..............................................................................................5
1.4論文架構..........................................................................................................7
第二章 W-CDMA中的細胞搜尋系統........................................................................8
2.1三通道的架構..................................................................................................8
2.2第一同步通道(Primary Synchronization Channel).........................................9
2.3第二同步通道(Secondary Synchronization Channel)...................................10
2.4 共同領航通道(Common Pilot Channel)......................................................14
2.5細胞搜尋的過程............................................................................................15
2.6序列式(Serial)或平型式(Pip-line)的細胞搜尋步驟.....................................16
2.7細胞搜尋的三步驟........................................................................................18
2.8由頻率誤差所延伸的問題............................................................................19
2.9平方根號電路的近似....................................................................................21
2.10第一同步通道的時槽同步..........................................................................22
2.11第二同步通道上碼框之同步和擾亂碼的碼組之判斷...............................26
2.12共同領航通道上之擾亂碼之碼組判斷......................................................32
第三章 具有干擾消除裝置的細胞搜尋系統............................................................35
3.1通道模型........................................................................................................36
3.3.1 基本通道模型....................................................................................36
3.1.2 細胞搜尋的通道模型........................................................................37
3.1.3 傑克斯通道模型................................................................................38
3.1.4 W-CDMA的通道模型.......................................................................39
3.2含有振幅計算的細胞搜尋第一步驟............................................................40
3.2.1 多路徑所造成的影響........................................................................40
3.2.2 細胞搜尋過程中多路徑振幅的計算................................................41
3.3具有干擾消除以及路徑選擇之細胞搜尋第二步驟....................................45
3.3.1 細胞搜尋過程第二步驟的改進........................................................45
3.3.2 細胞搜尋中多路徑的選擇和辨識....................................................46
3.3.3 細胞搜尋中的干擾去除....................................................................48
3.3.4 改良的細胞搜尋第二步驟................................................................51
3.4細胞搜尋第三步驟中的擾亂碼判斷............................................................53
第四章 細胞搜尋系統的效能分析............................................................................54
4.1細胞搜尋系統的機率模型............................................................................54
4.2細胞搜尋過程中的訊號與雜訊機率密度函數............................................55
4.3 細胞搜尋第一步驟的機率...........................................................................60
4.4細胞搜尋第二步驟的機率............................................................................60
4.5細胞搜尋第三步驟的機率............................................................................62
4.6干擾去除對錯誤率的影響............................................................................63
第五章 模擬結果........................................................................................................64
第六章 結論................................................................................................................72
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