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研究生:李進寶
研究生(外文):Chin-PaoLi
論文名稱:多跳躍感知無線電中繼選擇方法之研究
論文名稱(外文):On the Relay Selection for Multi-Hops Cognitive Radio Network
指導教授:張志文張志文引用關係
指導教授(外文):Chih-Wen Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電腦與通信工程研究所
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:2012
畢業學年度:100
語文別:英文
論文頁數:43
中文關鍵詞:感知無線電合作式網路空間多工中繼選擇
外文關鍵詞:Cognitive RadioCooperativeSpatial MultiplexingRelay Selection
相關次數:
  • 被引用被引用:0
  • 點閱點閱:88
  • 評分評分:
  • 下載下載:5
  • 收藏至我的研究室書目清單書目收藏:0
在感知無線電網路中,中繼節點可以幫助使用者在較差的環境下進行傳輸。然而選擇不同中繼點則會因為造成不同的訊號衰弱進而產生不同的通道增益。另一方面,藉由適應性空間多工技術可以在利用空間頻譜洞的同時避免對主要使用者造成擾。然而,其中的投影奇異值分解會因為周圍主要使用者數目的不同而降低傳輸容量。因此,在一個多跳躍合作式感知無線電中,基於周圍主要使用者的數目,我們提出一個中繼點的選擇方法以使次要系統擁有更高知系統容量。另外,我們使用消除瓶頸效應之時間分配方法解決因為不同跳躍間通道容量不同而產生的端點流量不平衡之問題。此方法調整傳輸時間間隔以匹配每一跳躍間之通道容量。模擬結果顯示我們所提出之方法在雙跳躍中繼網路之性能足以匹敵最佳選擇法,而其只需中繼點附近主要使用者之個數便足以形成決策,因此其所需之資訊量遠少於最佳選擇法之需要。
The technique of cognitive radio (CR) in cooperative communication can enhance the spectrum efficiency as well as avoid severe interference to the primary users (PUs). Relay node in CR can be helpful for transmission in the fading environment. Therefore, transmitting through different relay nodes can lead to different capacities of secondary user (SU), which is resulted from such factors as pass loss, fading, or shadowing. On the other hand, adaptive spatial multiplexing is used to exploit the spatial spectrum hole (SSH) in order to avoid the interference to PUs. However, the projected-channel singular value decomposition (P-SVD) technique will reduce the channel rank, and thus decrease the transmission capacity. In the thesis, we propose a number-based relay selection scheme in a multi-hop cooperative cognitive radio network, in which the number of surrounding PUs around the relay nodes is taken into consideration of relay selection in order to get a higher capacity of secondary system. The bottleneck effect elimination time allocation scheme is used in the thesis to solve the capacity unbalance between different hops, which adjusts the transmission time intervals (TTIs) to make the capacities matched. The simulation results demonstrate that performance of the proposed method can be very close to the optimal assignment in two-hop case. It should be noticed that using the proposed method, only the number of surrounding PUs should be known by the transmitter.
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 Introduction 1
1.2 Outline 2
2 Background and Literature Survey 3
2.1 Cognitive Radio Network 3
2.2 Cooperative Network 10
2.3 Literature Survey 12
3 System Model and Problem Formulation 14
3.1 System Model 14
3.1.1 Channel Model 14
3.1.2 Adaptive Spatial Multiplexing 17
3.1.3 Bottleneck Effect Elimination (BEE) Time Allocation Scheme 21
3.2 Problem Formulation 22
4 Relay Selection Schemes 24
4.1 Conventional Relay Selection Scheme 25
4.2 Proposed NBA Selection Scheme 25
5 Simulation Results 27
5.1 Simulation Model 27
5.2 Effects of Presence Probability of the Surrounding Primary Users 30
5.3 Effects of Busy Probability of the Alternative Relay Node 32
5.4 Effects of the Number of Alternative Relay Nodes 34
5.5 Effect of the Interference Constraint 36
6 Conclusions and Future Works 38
6.1 Conclusion 38
6.2 Future works 39
Bibliography 40
Vita 43
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