本論文中，我們提出了同步DS-CDMA系統下之一個可消除多重接取干擾的改良式盲目適應性方法，稱為PCMA方法，此方法跟MOE和CMA有一樣的益處，對多重接取干擾作抑制時不需已知干擾參數。我們對同步盲目多使用者接收器即MOE和CMA探討在新使用者加入或離開時的影響。在忽略雜訊的情況下，由於干擾個數突然增加或減少所引起的變動量，我們由對價值函數改變的觀點來作深入分析。明顯地可以看出大約在鎖定收斂的範圍下，假如變動量不大時，對CMA和MOE價值函數的改變是一樣的，但是也可發現CMA偵測器的暫態行為會因為現有的使用者個數漸漸接近處理增益而變得非常地不強健。為了克服CMA偵測器收斂速度的問題，我們加入一個可移除接收訊號中所欲訊號成分而不會對其他干擾訊號造成影響的投影矩陣，最後藉由與CMOE、ANMMSE、BAMMSE及Linear MMSE偵測器的比較證實其性能，所提出的接收器可以對抗多重接取干擾並且在時變使用者的環境下具有較高的容量且接近Linear MMSE偵測器的性能。

In this thesis, we propose a modified blind adaptive approach to MAI cancellation for synchronous DS-CDMA systems, termed PCMA Approach. It has the same advantage as MOE and CMA of suppressing MAI without the explicit knowledge of interference parameters. We study the effect of arrival and departure of new users to the synchronous blind multiuser receivers, namely MOE and CMA. The perturbation caused by this sudden birth or death of interferers is examined from the viewpoint of the change of the cost function under the noiseless assumption. It is shown that in the vicinity of lock convergence, the changes in the CMA and MOE costs are the same if the perturbation is small enough. But it is also observed that the transient behavior of the CMA detector becomes significantly less robust as the existing number of users approaches the processing gain. To overcome this question of the CMA detector, we employ a projection matrix P that can remove the desired signal from the received signal with other interferers unchanged. Finally its performance has been demonstrated by numerical results in comparison with CMOE, ANMMSE, BAMMSE and Linear MMSE. The proposed receiver can combat MAI, approach the performance of Linear MMSE and have a higher capacity and fast convergence rate for a time-varying user population.

感謝詞 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖表目錄 vi
第一章 緒言 1
1.1 文獻探討 1
1.2 研究動機 3
第二章 直接序列分碼多重接取系統 5
2.1 直接序列展頻技術 5
2.2 盲目適應性多使用者偵測技術 8
2.3 同步直接序列分碼多重接取系統 10
2.3.1 同步DS-CDMA系統下的基頻帶訊號模型 10
2.3.2 傳統偵測器 12
2.3.3 最小輸出能量偵測器 13
2.4 多重接取干擾和遠近效應 16
第三章 同步DS-CDMA系統下的多使用者偵測器 32
3.1 限制化最小輸出能量偵測器 32
3.2 固定式最小均方誤差偵測器 34
3.3 盲目適應性最小均方誤差偵測器 36
3.4 常模演算法偵測器 37
3.5 電腦模擬與分析 41
第四章 加入投影矩陣的常模演算法偵測器 61
4.1 常模演算法加入新使用者的動態分析 61
4.2 加入投影矩陣的常模演算法偵測器 65
4.3 電腦模擬與分析 67
第五章 討論與建議 85
參考文獻 87
縮寫 91

圖 目 錄

圖1-1 研究方法與流程 5
圖2-1 專案目標 16
圖2-2 專案的生命週期 17
圖2-3 矩陣式組織 22
圖2-4 價值工程應用對成本的影響 28
圖3-1 石化廠統包工程專案管理架構 32
圖3-2 石化廠統包工程專案組織 43
圖3-3 專案執行流程 50
圖3-4 專案管制過程 56
圖4-1 C公司專案管理資訊系統 79
圖4-2 再沸器安裝示意圖 81
圖4-3 再沸器加裝彈簧吊裝示意圖 82



表 目 錄

表2-1 專案階段的管理工作 18
表2-2 專案階段的管理工作 19
表2-3 石化廠統包工程專案階段的管理工作 20
表2-4 價值工程詳細內容 27
表3-1 公共工程合約常見之問題 39
表3-2 器材採購計畫 47
表3-3 工程發包計畫 49
表4-1 報價時程 65
表4-2 報價問題澄清事項與回覆 66
表4-3 專案評估與檢討重要結論 66
表4-4 合約稿修正內容 68
表4-5 細部設計成本預算 73
表4-6 直接設計人力預算編列原則 74
表4-7 部份器材採購計畫 76
表4-8 部份工程發包計畫 77
表4-9 管線工程檢驗與測試管制點 89

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