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論文名稱 Title |
超寬頻系統中使用CLEAN演算法之選擇性耙式接收機的效能比較 Performance Comparison of Selective Rake Receivers with CLEAN Algorithms in UWB Systems |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
106 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2006-07-07 |
繳交日期 Date of Submission |
2006-07-26 |
關鍵字 Keywords |
直接序列超寬頻、超寬頻、選擇性耙式接收機、脈衝無線電超寬頻、脈衝雷達 CLEAN Algorithm, Two-Stage CLEAN Algorithm, UWB-Impulse Radio, Pulse Radar, Deng's Modified CLEAN Algorithm, Selective Rake Receiver, Ultra-Wideband, DS-UWB |
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統計 Statistics |
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中文摘要 |
超寬頻(Ultra-Wideband, UWB)通道具有密集性多重路徑特性,使得耙式接收機(Rake Receiver)面臨系統效能與設計複雜度之取捨議題,因此發展出選擇性耙式接收機(Selective-Rake)之概念。其主要構想為估測接收訊號在已知無線傳輸通道所遭受之干擾強度,進而決定耙式接收機之相關器個數(Fingers)。同時以結合搜尋最佳訊號路徑的CLEAN演算法,來實現選擇性耙式接收機的架構。若能改進CLEAN演算法提升搜尋路徑的正確性,則可達到提升輸出效能的結果;Two-Stage CLEAN演算法是根據區段相對最大峰值之特性而來,以較小時間區段搜尋而得到更精確路徑延遲時間;Deng’s Modified CLEAN演算法,利用平均振幅的變化作為判斷是否為真實路徑的準則,達到消除雜訊和旁波瓣干擾的目的,進一步達到效能提升。在本論文中,將模擬CLEAN、Two-Stage CLEAN和Deng’s Modified CLEAN演算法在三種不同調變技術下於選擇性耙式接收機的系統效能,這三種技術分別是脈衝無線電超寬頻、脈衝雷達和直接序列超寬頻技術,再透過輸出效能比較方式得到Two-Stage CLEAN演算法是搜尋路徑正確性最高的演算法。 |
Abstract |
The Ultra-Wideband (UWB) channel is a dense multipath channel. The system performance and design complexity issues of selective-Rake receiver (SRake) are studied. Rake receiver has difficulties achieving desired system performance in the dense multipath environment. The main ideas of SRake receiver are to obtain the SNR level on known multipath channel and determine the desired number of Rake fingers. In the implementation of the SRake, the CLEAN algorithm is used in selecting the paths with relatively high energy. We can improve the performance of SRake receiver by increasing the accuracy of path selection. By the property of local maximum peak within the smaller partition, Two-Stage CLEAN algorithm acquires the more accurate delay time of multipath. In order to mitigate the sidelobe effect and noise interference, the key assumption in the Deng’s Modified CLEAN algorithm is that using average amplitude around the considered data change as the criterion to determine if the data value is a true path. In this thesis, we investigate CLEAN, Two-Stage CLEAN and Deng’s Modified CLEAN algorithm in three different systems including UWB-Impulse Radio, Pulse Radar and DS-UWB. From the performance comparison, it can be seen that the Two-Stage CLEAN algorithm that has the highest accuracy of path selection in UWB system. |
目次 Table of Contents |
誌謝.......................................................................................................................i 中文摘要..............................................................................................................ii 英文摘要.............................................................................................................iii 目錄................................................................................................................iv 圖目錄.................................................................................................................vi 表目錄.................................................................................................................ix 第一章 序論……………………………………………………………………1 1.1 前言………………………………………………………………….1 1.2 研究動機…………………………………………………………3 1.3 全文結構…………………………………………………………….4 第二章 超寬頻系統簡介………………………………………………………6 2.1 超寬頻通道模型…………………………………………………….6 2.1.1 通道參數設定...........................................................................7 2.1.2 通道模擬實現方法.................................................................11 2.2 脈衝訊號波形…………………………………………………16 2.3 脈衝無線電超寬頻調變技術…………………………………….18 2.4 脈衝雷達調變技術............................................22 2.4 直接序列超寬頻技術...........................................24 第三章 選擇性耙式接收機..................30 3.1 選擇性耙式接收機之主要概念.........................30 3.2 耙式接收機通用架構........................................31 3.3 選擇性耙式接收機效能分析........................................35 3.4 選擇性耙式接收機之實現........................................40 第四章 CLEAN演算法 .........41 4.1 簡介...............................................................41 4.2 演算法探討......................................................43 4.2.1 各種改良式CLEAN演算法簡述...........................................44 4.2.2 Deng’s Modified CLEAN演算法...........................................47 4.3 Two-Stage CLEAN演算法..........................51 4.4 Two-Stage CLEAN與Deng’s Modified CLEAN演算法之比較....54 第五章 Two-Stage CLEAN演算法於選擇性耙式接收機之效能分析 ...60 5.1 脈衝無線電超寬頻技術之模擬............................61 5.2 脈衝雷達技術之模擬....................................................70 5.3 直接序列超寬頻技術之模擬.......................................77 5.4 實驗模擬結果之比較分析.......................................84 第六章 結論與建議..........................................................................................90 附錄A.............................................................................................................92 參考文獻............................................................................................................94 |
參考文獻 References |
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