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研究生:郭豐碩
研究生(外文):Feng-shuo Kuo
論文名稱:信號干擾比估測之研究
論文名稱(外文):Study on SIR Estimations
指導教授:陳儒雅
指導教授(外文):Ju-ya Chen
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:2003
畢業學年度:92
語文別:中文
論文頁數:84
中文關鍵詞:信號干擾比寬頻分碼多重進接系統多使用者偵測
外文關鍵詞:multiuser detectionwide code division multiple accessSIR
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在微細胞系統中的頻率重複使用,是為了要增加整體系統的頻譜使用效率,但是使用相同頻率使用者間的共通道干擾卻不可避免地伴隨系統,因此信號干擾比通常可以當作衡量通訊品質好壞的一項指標。許多行動通訊系統在設計資源分配、換手、功率控制等演算法時,大多需要即時的信號干擾比資訊,而這些演算法通常假設信號干擾比能夠順利的求得並且能夠即時的更新,但是真正探討如何求得系統信號干擾比的文獻卻很少。本論文將針對現有之信號干擾比估計的方法做文獻之搜尋,而後提出三種簡單的估計方式,分別為展頻碼片統計特性估計法、解相關偵測估計法與正交碼統計趨近法來對寬頻分碼多重進接系統的信號干擾比做估計器的設計。
Frequency reuse scheme is used to enhance the spectral efficiency in a cellular system, but inevitably the system suffers from co-channel interference of other users. Signal-to-interference ratio (SIR) is often used as a quality index of communication links. Several wireless communication algorithms, such as channel assignment, handover and power control, need real-time SIR information. All of these algorithms are under the assumptions that real-time SIR is available, but the methods of obtaining real-time SIR are seldom mentioned with these algorithms. In this thesis, we investigate three simple SIR estimation methods including statistics of spreading chips method, decorrelation detection method, and orthogonal stochastic approximation method. The performance of these SIR estimation methods are evaluated by computer simulations in a WCDMA system.
誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章、緒論 1
1-1 研究動機與目的 1
1-2 文獻探討 2
1-3 章節介紹 3
第二章、背景知識與相關研究 5
2-1 微細胞式行動通訊系統與共通道干擾成因 5
2-2 無線傳播環境與通道特性 8
2-2-1 無線電波特性 9
2-2-2 無線通道特性 10
2-2-3 傑克斯通道模型 13
2-4 多使用者偵測技術 16
2-4-1 多使用者偵測技術的分類與介紹 16
2-4-2 直接序列分碼多重進接系統 18
2-4-3 傳統偵測器 19
2-4-4 解相關偵測器 22
2-4-5 其餘常見的偵測器 24
2-5 寬頻分碼多重進接系統傳播結構 25
第三章、信號干擾比估計方式的研究 31
3-1 動差法 31
3-2 展頻碼片統計特性估計法 33
3-3 解相關偵測估計法 39
3-4 正交碼統計趨近法 43
第四章、電腦程式模擬結果 48
4-1 利用動差法模擬估計器效能 48
4-2 利用展頻碼片統計特性法模擬估計器效能 50
4-3 利用解相關偵測估計法模擬估計器效能 55
4-4 利用正交碼統計趨近法模擬估計器效能 60
4-5 在寬頻分碼多重進接系統下三種估計器的效能比較 68
第五章、結論與未來方向 72
參考文獻 73
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