全雙工功率放大轉傳雙向中繼網路之功率分配最佳化

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研究生：	李俊緯 Li, Jyun-Wei
論文名稱：	全雙工功率放大轉傳雙向中繼網路之功率分配最佳化 On the Optimal Power Allocation for Two-Way Full-Duplex AF Relay Networks
指導教授：	林澤 Lin, Che
口試委員:	翁詠祿高榮駿
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 通訊工程研究所 Communications Engineering
論文出版年：	2016
畢業學年度：	104
語文別：	英文
論文頁數：	61
中文關鍵詞：	全雙工系統、雙向網路、中繼放大轉傳、自干擾、功率分配、效能最大化
外文關鍵詞：	full-duplex systems, two way relay networks, amplify and forward relaying, self-interference, power allocation, utility maximization
相關次數：	點閱：2 下載：0
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本文探索了在中斷機率以及功率限制下全雙工轉傳雙向中繼網路中最佳化功率分配來達到系統效能最大化。我們考慮了個體功率限制以及總和功率限制,要制定出相對應的最佳化問題,我們需要計算中斷機率的封閉解,在全雙工收發器下,這種封閉形式的推導變得更加複雜,因此,我們以近似的中斷機率封閉解取而代之。我們得到的最佳化問題是一個非凸特性問題,所以我們進一步使用連續凸近似 (SCA) 方法來解決。我們的模擬結果表明中斷概率近似封閉解的精確性,並且SCA演算法接近最佳的效能以及在個體功率約束下與全功率分配分式或者是在總和功率限制下與均勻功率分配方式比較都有著系統性能以及功率消耗的優勢。我們的研究結果進一步說明,由 SCA 演算法產生明智的分配功率至同時傳輸下的中繼節點與中繼選擇方案相比下高達46%的性能增益。在觀察殘餘自干擾在全雙工和半雙工系統之間的一個取捨,有趣的是,我們的結果表明,在全雙工系統中交叉鏈路干擾相對於殘餘自干擾更嚴重的降低了系統性能。

This thesis investigates the optimal power allocation that maximizes the system utility for a full-duplex (FD) amplify-and-forward (AF) relaying two-way relay network (TWRN) with a rate outage and a power constraint. Both cases of an individual and a sum power constraint are considered. To formulate the corresponding optimization problem, closed-form expressions of outage probabilities are needed. With FD transceivers, the derivation of such closed-form expressions become too involved. Thus, approximate closed-form expressions were derived instead. The resulting optimal problem is still non-convex and difficult to solve. Via solving a series of approximate convex problems, a successive convex approximation (SCA) algorithm was proposed. Our simulation results demonstrate the accuracy of the approximate closed-form expressions of outage probabilities and that the proposed SCA algorithm achieves near-optimal performance and significantly outperforms the full power allocation under the individual power constraint and uniform power allocation under the sum power constraint both in system utility and in power consumption. Our results further show that simultaneous power transmission for all relay nodes with judicious power allocation generated by the SCA algorithm achieves as high as 46% of performance gain over the relay selection scheme. A tradeoff between the FD system and the half-duplex (HD) system with respect to the residual interference was also observed. We can also observe that not only the residual self-interference but also cross-link interference is a factor that degrades the system performance for a FD system.

Contents
Acknowledgments..................................i
Abstract in Chinese..................................ii
Abstract..................................iii
Contents .................................. iv
ListofFigures.......................................... vi
Introduction ..................................1
System Model and Problem Formulation.................................. 5
Approximate Closed-Form Expressions for Outage Probabilities................ 10
1 SingleRelayNode .................................... 11 
2 MultipleRelayNodes................................... 13 
3 ApproximationAccuracy................................. 17
Optimization Problem for FD Two-Way Relay Channels 20
1 SingleRelayNode .................................... 20  
1.1 ConvexApproximationFormulation....................... 21
1.2 Successive Convex Approximation (SCA) Algorithm ..................................25 
2 MultipleRelayNodes................................... 27 
2.1 ConvexApproximationFormulation....................... 27 
2.2 Successive Convex Approximation (SCA) Algorithm .................................. 32 
3 ConvergenceAnalysis .................................. 34
Simulation results ..................................38
1 SingleRelayNode .................................... 39 
2 MultipleRelayNodes................................... 42 
3 ComparisonwithaRelaySelectionScheme ....................... 45 
4 ComparsionbetweenaHDandaFD........................... 48 
5 ConvergenceBehavior .................................. 49
Conclusion Appendix Bibliography ..................................51
Appendix ..................................53
Bibliography.................................. 61

                                

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