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研究生:黃志鴻
研究生(外文):Chih-HongHuang
論文名稱:在合作式無線網路中受限過時通道資訊與功率限制的機率性中繼點選擇機制
論文名稱(外文):Opportunistic Relay Selection in Cooperative Wireless Networks with Outdated CSI and Power Constraint
指導教授:劉光浩
指導教授(外文):Kuang-Hau Liu
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:60
中文關鍵詞:中繼點選擇通道資訊解碼並傳送多樣性中斷機率
外文關鍵詞:Relay selectionCSIdecode-and-forwarddiversityoutage probability
相關次數:
  • 被引用被引用:0
  • 點閱點閱:129
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  • 下載下載:16
  • 收藏至我的研究室書目清單書目收藏:0
在具有多個中繼點的無線網路中,所有中繼點都參與合作會消耗過多額外的資源,在許多文獻中,機率性中繼點選擇機制已經被證明是一個有效率的方法。然而,機率性中繼點選擇機制必須有著完美的通道資訊,才能在接收端達到多樣性增益。對具有移動性的節點來說,準確的通道資訊是很難達到的。因此,機率性中繼點選擇機制的功效會大大地被降低。本篇論文提出了一個強健的中繼點選擇機制來減輕過時通道資訊的影響,其中,中繼點執行的動作為解碼並傳送,且在接收端使用最大比例合併,並且,所提出的方法與機率性中繼點選擇機制相比,維持了相同的功率耗損。因此,我提出的堅韌中繼點選擇機制消耗的功率與機率性中繼點選擇機制相同。為了評估所提出方法的效益,我們分析其中斷機率的理論值,並以不具有中繼點選擇機制的傳統合作式傳輸為基準進行比較。經由廣泛的實驗結果,證明了理論分析的正確性並對重要參數在所提出的新方法中產生的影響進行深入討論。結果顯示,和機率性中繼點選擇機制相比,採取本篇論文所提出的堅韌中繼點選擇機制可以有著較低的中斷機率和較輕微的過時通道資訊影響。
In multi-relay wireless networks, relay cooperation consumes additional resources. Opportunistic relay selection (ORS) has been proven to be an efficient approach in the recent research thanks to its low complexity and high spectral efficiency. However, perfect channel state information (CSI) is generally required to achieve full diversity. For mobile nodes, accurate CSI is difficult to obtain and thus the efficacy of ORS may be degraded significantly. In this thesis, a relay selection scheme named Robust is proposed to alleviate the impact of outdated CSI. It is based on decode-and-forward (DF) and using maximum ratio combing (MRC) at the receiver. Besides, a maximum power constraint is applied so that the total power consumption of Robust scheme is identical to that of ORS. At the mean time, cooperative relaying without selection, namely, all-participate scheme is considered as the bench. To evaluate the performance of the proposed scheme, the outage probability is analyzed theoretically. Extensive simulations are conducted to validate the analysis accuracy and to get insights into the impacts of various important system parameters to the proposed relay cooperation scheme. The results suggest that Robust scheme has a lower outage probability and is less sensitive to outdated CSI compared with ORS.
Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Certification of Passed Oral Examination . . . . . . . . . . . . . . . . ii
Chinese Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
English Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
List of Variables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
List of Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Background and Literature Review . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Introduction to Cooperative Cooperation . . . . . . . . . . . . . . . . . 3
2.1.1 Relaying Stategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.2 Relay Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.3 Cooperative Diversity Protocol . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Impact of Mobility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Diversity Combing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Literature Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.1 ORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.2 Different Relay Selection . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Opportunistic Relay Selection with Inaccurate CSI and Power Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1.1 Signal Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Relay Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Outdated CSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3.1 How to Generate Correlated Rayleigh Fading Envelopes . . . . 17
3.4 Performance Criterion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.5 Propose Scheme and All-participate Scheme . . . . . . . . . . . . 22
3.5.1 All-participate Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5.2 Robust Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6 Performance Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.6.1 Performance Analysis of All-participate Scheme . . . . . . . . . 24
3.6.2 Performance Analysis of Robust Scheme . . . . . . . . . . . . . 26
3.7 Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4 Simulation Results and Discussions . . . . . . . . . . . . . . . . . . . . . 29
4.1 Outage Probability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1.1 The Impact of Average SNR. . . . . . . . . . . . . . . . . . . . . . 30
4.1.2 The Impact of Number of Relays . . . . . . . . . . . . . . . . . . . . 31
4.1.3 The Impact of Correlation Coefficient . . . . . . . . . . . . . . . . . . . 32
4.2 Power Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.2.1 The Impact of Power Allocation . . . . . . . . . . . . . . . . . . . . . 33
4.3 Non-i.i.d case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5 Conclusion and Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.1 Summary of Thesis Contribution . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
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