本篇論文在毫米波頻段多使用者的系統環境裡，利用非正交多工(Non-Orthogonal multiple access, NOMA)，更有效的使用頻寬，因為使用了疊加編碼(Superposition coding)技術，在同一個頻帶中可以將使用者的訊號疊加後傳送，並利用不同功率來區分訊號，接收端則使用連續干擾消除(Successive Interference Cancellation, SIC)技術，來消除使用者間的訊號干擾。基地台將使用者分配到不同群集內，採用零迫法(Zero-Forcing, ZF)設計各群集的波束賦形向量，降低群集間干擾，基於此波束賦型設計我們提出一套演算法，分配群集間的功率以提升整體的傳輸速率，這個最佳化問題利用到拉格朗日乘數法(Lagrange multiplier method)求解，為了簡化最佳化問題，先假設一組每群的初始值，帶入群內功率分配值及干擾項後，再利用疊代法(Iterative Method)的方式以及運用到二分搜尋法(Bisection Method)尋找最佳解，完成功率分配的演算法。最後利用電腦模擬結果，本篇提出來的功率分配，相較於等群集功率策略，更能有效提升總傳輸速率。

In this these, we consider millimeter wave(mm Wave) downlink where non- orthogonal multiple access (NOMA) method is adopted to enhance spectrum efficiency. With superposition coding, the base station (BS) simultaneously transmits multiple users’ signals which can be distinguished with different power. The receiver at each mobile station (MS) adopts successive interference cancellation (SIC) technology to eliminate inter-user interference. The BS partitions MSs into different clusters and employs zero-forcing (ZF) criterion to design beamforming vector for each cluster to reduce inter-cluster interference. Based on the clustering and beamforming design, we proposed an algorithm to allocate transmission power among various clusters, in order to further improve the system capacity. We apply the method of the Lagrange multiplier and obtain the optimal solution through the proposed iterative algorithm and the bisection method. It shows from simulation results that the proposed power allocation effectively raise the system capacity compared with the case of equal power among all clusters.

論文審定書 i
誌謝 ii
中文摘要 iii
ABSTRACT iv
目錄 v
圖目錄 vii
表目錄 viii
Chapter 1 介紹 1
Chapter 2 文獻探討 5
2.1 非正交多工系統與迫零系統比較 5
2.2 毫米波下多使用者大規模系統 9
Chapter 3 系統模型 17
3.1 用戶配置與通道模型 17
3.2 傳送與接收訊號 19
3.3 波束向量之設計 21
3.4 迫零法 23
Chapter 4 最佳化問題 25
4.1 功率分配最佳化 25
4.2 實例討論 29
4.3 尋找最佳整體傳輸速率的流程 41
Chapter 5 模擬結果 45
Chapter 6 結論 50
參考文獻 51

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