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研究生:周孫中
研究生(外文):Chou,sun-chung
論文名稱:適用於多組不同射頻訊號之帶通取樣技術
論文名稱(外文):Bandpass Sampling Techniques for Multiple Distinct RF Signals
指導教授:曾敬翔曾敬翔引用關係
指導教授(外文):Ching-Hsiang Tseng
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:中文
論文頁數:68
中文關鍵詞:帶通取樣軟體無線電膺頻射頻訊號類比至數位轉換
外文關鍵詞:Bandpass SamplingSoftware radioAliasingRF signalAnalog-to-digital conversion
相關次數:
  • 被引用被引用:1
  • 點閱點閱:216
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
由帶通取樣定理得知針對射頻訊號取樣時,帶通取樣可以有效降低所需要的取樣頻率,除此之外,也可以大幅降低硬體電路的複雜程度。然而,傳統的帶通取樣定理只有考慮單一個帶通射頻訊號的情況,使用上勢必受到相當大的侷限,再加上目前軟體無線電架構通訊系統的設計趨勢下,於是適用於多組訊號的帶通取樣定理的發展便日漸受人注意。有關於多組訊號帶通取樣定理這方面的研究,之前所提出的方法需要大量而繁瑣的計算過程,造成實用性上不能使人滿意。在本論文中,我們提出了一個尋找取樣頻率的不同思考方向,跟其他方法所不同的是本方法在尋找多個訊號的取樣頻率的過程中,並不是使用畫圖取其交集或是將所有可能情況一一測試的方式,而是經由數學推導在所有不同的頻譜排列之下,計算出關於各種頻譜取樣頻率的不等式,而不等式的邊界則是由各個待取樣訊號的參數決定(頻寬、所在位置等等),只需根據待取樣訊號的參數即可決定何種頻譜排列方式成立,且得到可使用的取樣頻率,如此一來使多訊號帶通取樣定理可以降低相當多的計算複雜度,使其更容易地在計算機上實現,而這種對待取樣訊號有著高度彈性方法也符合了軟體接收機設計的原則。而關於各種頻譜取樣頻率的不等式,本論文也提出了一個結構化的求得方式,能夠有系統地將適用於多組訊的取樣頻率不等式快速地尋找出來。本論文所獲致的成果可應用於軟體無線電接收機,以降低硬體電路之設計成本。
Bandpass sampling can be used in taking samples of radio frequency (RF) signals to decrease the required sampling frequency. In addition, it can also significantly reduce the complexity of the hardware design. However, the conventional bandpass sampling criterion applies only to a single bandpass signal, which greatly confines its practicality. This in addition to the trend of software radio development motivated the research of bandpass sampling criteria for multiple bandpass signals. With regard to the research on sampling multiple bandpass signals, previously proposed methods require a great deal of calculation in order to find suitable bandpass sampling frequencies. This inconvenience limits the practicality of these methods. In this thesis, we propose a new approach to find the valid sampling frequencies for multiple bandpass signals. Unlike conventional methods, which use exhaustive tests or overlapped graphics, the proposed method finds the valid sampling frequencies for various orders of spectral replicas in the spectrum of the sampled signals. For a given problem, we can determine the appropriate sampling frequencies by simply using the given parameters of these signals (such as bandwidths, locations, ect). This simplifies the process of finding the valid sampling frequencies and makes the implementation much easier on a microprocessor. Besides, we provide an efficient and systematic method which facilitates finding sampling criteria for a large number of RF signals based on the result for smaller numbers of RF signals. The proposed method can be used in designing software radio receivers to reduce the cost of the hardware.
目 錄
第一章 緒論 1
1.1 軟體無線電簡介…………………………………1
1.2 研究動機與目的…………………………………4
1.3 各章節內容概要…………………………………5
第二章 取樣定理 7
2.1 取樣………………………………………………7
2.2 奈氏準則及膺頻…………………………………9
2.3 帶通取樣原理……………………………………11
2.4 多訊號之帶通取樣技術…………………………15
2.4.1 測試法………………………………………15
2.4.2 圖解法………………………………………17
第三章 兩組射頻訊號之帶通取樣法則 19
3.1 帶通取樣條件分析………………………………19
3.2 帶通取樣頻率之快速演算法……………………30
3.3 取樣後訊號中心頻率位置之決定………………32
第四章 三組射頻訊號之帶通取樣法則 34
4.1 三組訊號之帶通取樣條件分析…………………34
4.2 三組訊號之帶通取樣頻率演算法………………48
第五章 電腦模擬結果 54
5.1 兩組帶通訊號之電腦模擬………………………54
5.2 三組帶通訊號之電腦模擬………………………57
5.3 GSM 訊號之電腦模擬……………………………60
第六章 結論 65
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