臺灣博碩士論文加值系統

智慧型無線通訊技術感知無線電(Cognitive radio, CR)，因無線通訊使用越趨發達而衍生頻譜分配不平均的問題，為了解決頻譜擁塞與頻帶未妥善利用而發展出的無線通訊技術。感知無線電中的動態頻譜管理(dynamic spectrum management)為主要的管理機制，在此之前，我們必須先在無線環境中先行偵測訊號存在與否，此動作為頻譜偵測。
我們選用能量偵測器(Energy Detection, ED)作為其頻譜偵測的技術，優點在於它只需知道較少偵測環境的知識且複雜度低，所以被廣泛的應用在感知無線電系統中，然而缺點則是在低訊號雜訊比(Signal to Noise Ratio, SNR)的偵測環境下效能較差。
本篇論文利用合作式頻譜偵測，利用多個感知中繼端(multiple cognitive relays)進行資料偵測，將所收到的資料傳給資料整合中心(fusion center, FC)進行數據融合(data fusion)。並且以多種數據融合的方法做出模擬與比較，探討隱藏終端的問題與數據融合在頻譜偵測上的優劣。

Cognitive radio(CR) is a novel intelligent wireless communication technology. It is proposed to solve the problem that the spectrum is not averagely allocated when the wireless network is rapidly developed. Dynamic spectrum management is the most important mechanism of cognitive radio. We first have to detect the existence of the signal under a wireless environment, which is called the spectrum sensing technique.
We choose energy detector(ED) as the spectrum sensing technique. The advantage is that it requires less prior knowledge with low complexity, so it is the most widely used in cognitive radio system. But the disadvantage is that the detection performance is bad in environment with low signal to noise ratio.
In this thesis, cooperative spectrum sensing is used with multiple cognitive relays to detect the primary user, and then the data is transmitted to the fusion center for data fusion. We use three data fusion schemes and discuss the hidden terminal problem about advantage and disadvantage.

中文摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 IX
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 研究目的 7
1.4 論文架構 7
第二章 感知無線電介紹 9
2.1 感知無線電背景 9
2.2 感知無線電系統 11
2.3 感知無線電技術 15
2.4 頻譜偵測簡介 16
2.4.1 傳輸端偵測 17
2.4.2 能量偵測器 18
2.4.3 匹配濾波偵測器 20
中文摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 IX
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 研究目的 7
1.4 論文架構 7
第二章 感知無線電介紹 9
2.1 感知無線電背景 9
2.2 感知無線電系統 11
2.3 感知無線電技術 15
2.4 頻譜偵測簡介 16
2.4.1 傳輸端偵測 17
2.4.2 能量偵測器 18
2.4.3 匹配濾波偵測器 20
2.4.4 循環穩態特徵偵測器 21
第三章 合作式頻譜感知偵測 23
3.1 合作式偵測決策簡介 23
3.2 單一路徑訊號偵測技術 25
3.3 多重路徑訊號結合技術 29
3.3.1最大比例結合(Maximal Ratio Combining) 30
3.3.2等增益結合(Equal Gain Combining) 32
3.3.3平方律結合(Square Law Combining) 32
第四章 能量偵測器於合作式感知偵測 35
4.1 系統架構 35
4.2 能量偵測器於多重路徑結合技術 38
4.2.1 最大比例結合於能量偵測器 39
4.2.2 等增益結合於能量偵測器 40
4.2.3 平方律結合於能量偵測器 41
第五章 模擬與分析 43
5.1 偵測器效能評估 43
5.1.1 不同訊號雜訊比對於偵測率模擬分析 43
第六章 結論與未來展望 51
6.1 結論 51
中文摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 IX
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 研究目的 7
1.4 論文架構 7
第二章 感知無線電介紹 9
2.1 感知無線電背景 9
2.2 感知無線電系統 11
2.3 感知無線電技術 15
2.4 頻譜偵測簡介 16
2.4.1 傳輸端偵測 17
2.4.2 能量偵測器 18
2.4.3 匹配濾波偵測器 20
2.4.4 循環穩態特徵偵測器 21
第三章 合作式頻譜感知偵測 23
3.1 合作式偵測決策簡介 23
3.2 單一路徑訊號偵測技術 25
3.3 多重路徑訊號結合技術 29
3.3.1最大比例結合(Maximal Ratio Combining) 30
3.3.2等增益結合(Equal Gain Combining) 32
3.3.3平方律結合(Square Law Combining) 32
第四章 能量偵測器於合作式感知偵測 35
4.1 系統架構 35
4.2 能量偵測器於多重路徑結合技術 38
4.2.1 最大比例結合於能量偵測器 39
4.2.2 等增益結合於能量偵測器 40
4.2.3 平方律結合於能量偵測器 41
第五章 模擬與分析 43
5.1 偵測器效能評估 43
5.1.1 不同訊號雜訊比對於偵測率模擬分析 43
第六章 結論與未來展望 51
6.1 結論 51
6.2 未來展望 51
參考文獻 53

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