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系統識別號 U0026-1302201216380000
論文名稱(中文) 感知無線電網路中最大頻譜使用效率之中繼選擇
論文名稱(英文) Maximum Spectrum Efficiency Relay Selection for Cognitive Radio Network
校院名稱 成功大學
系所名稱(中) 電腦與通信工程研究所
系所名稱(英) Institute of Computer & Communication
學年度 100
學期 1
出版年 101
研究生(中文) 林家緯
研究生(英文) Chia-Wei Lin
學號 q36981539
學位類別 碩士
語文別 英文
論文頁數 46頁
口試委員 口試委員-李彥文
口試委員-劉光浩
指導教授-張志文
中文關鍵字 感知無線電  解碼轉送  最大頻譜使用效率之中繼選擇  轉換比 
英文關鍵字 Cognitive radio  decode-and-forward  maximum spectrum efficiency relay selection  transfer ratio 
學科別分類
中文摘要 在傳統的轉送解碼的合作式網路下, 中繼點的選擇方法主要遵循最大−最
小策略, 也就是說被選來幫忙傳送資料封包的中繼點與其最大-最小的通道增
益相關。然而, 最大−最小策略有可能對主要系統(primary system) 造成多餘的干擾導致所謂的轉換比(transfer ratio) 變得較差。值得注意的是我們把轉換比定義為次要系統(secondary system) 的容量增益與主要系統的容量損失之比值, 而主要系統的損失乃次要系統的通訊活動所造成的。在本篇論文, 我們針對重疊式(underlay) 的感知無線電網路提出一種名為最大頻譜使用效率之中繼選擇的中繼點選擇方法。我們的選擇方法主要的概念在於選擇能使主要系統與次要系統的容量相加最大化的中繼點, 因此我們的選擇方法確保了主要系統的容量損失不會被浪費。最後, 經由模擬結果我們發現所提出的最大頻譜使用效率之中繼選擇方法在轉換比上優於傳統的最大-最小法則, 這也意味著我們所提出的方法能達到最大的頻譜使用效率。
英文摘要 In the conventional decode-and-forward (DaF) cooperative networks, the relay selection method mainly follows the rule of max-min policy, which means the relay associated with the max-min channel gain can be selected to forward the data packets. However, the max-min policy may cause some extra amount of interference to the primary system (PS) such that the so-called transfer ratio (TR) can be lower. Note that the transfer ratio is defined as the ratio of the secondary system (SS)’s capacity gain to the PS’s capacity loss due to the activities of the SS. In this thesis, we proposed a novel relay selection for the underlay cognitive radio (CR) networks called maximum spectrum efficiency relay selection. The key idea here is to select a relay that maximizes the sum capacity of the PS and SS. This method assures that the PS’s capacity loss will not be wasted. At last, through simulation results, we show that the proposed maximum spectrum efficiency relay selection can own a higher TR compared with the conventional max-min rule. Therefore, our relay selection strategy achieves maximum spectrum efficiency utilization.
論文目次 Chinese Abstract i
English Abstract ii
Acknowledgements iii
Contents iv
List of Tables vi
List of Figures vii
Glossary of Symbols ix
1 Introduction 1
1.1 Problem Formulation and Solution . . . . . . . . . . . . . . . . . . . . 1
1.2 Thesis Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Background and Literature Survey 4
2.1 Cognitive Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.1 Spectrum Access Models for Cognitive Radios . . . . . . . . . . 5
2.2 Cooperative Wireless Network . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1 Cooperative Model and Protocols . . . . . . . . . . . . . . . . . 9
2.2.2 Single Relay Selection Schemes . . . . . . . . . . . . . . . . . . 10
2.3 Approximation of Sum of Lognormal Random Variables . . . . . . . . . 11
2.4 Literature Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3 System Model 15
3.1 Received Signal Expression and Channel Model . . . . . . . . . . . . . 16
3.2 Approximation of Sum of Lognormally Distributed Inter-Cell Interference 19
3.3 Relay Selection Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 The Maximum Spectrum Efficiency Relay Selection 22
4.1 Maximum Spectrum Efficiency Relay Selection . . . . . . . . . . . . . . 23
4.2 Performance Analysis of the Maximum Spectrum Efficiency Relay Selection 26
4.2.1 Outage Probability of the Primary User . . . . . . . . . . . . . 26
4.2.2 Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5 Numerical and Simulation Results 29
5.1 Performance of Maximum Spectrum Efficiency Relay Selection . . . . . 31
5.2 Comparison of Capacity and Transfer Ratio . . . . . . . . . . . . . . . 33
6 Conclusions and Future Works 38
6.1 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2 Future Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Appendix A 40
Bibliography 42
Vita 46
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