比起傳統階層式感知網路，覆蓋式感知無線網路的主要使用者系統與次要使用者系統可以更有效率利用頻譜。在本篇論文我們提出新的設計架構，將能量採集裝置置於主要使用者接收端，使得主要使用者系統不只能分享頻帶同時利用能量採集來解碼訊息，次要使用者系統將主要使用者的訊號放大後傳送並傳遞能量給主要使用者接收端做使用。而頻譜與能量合作式策略目標是最大化訊息及能量轉換效益，透過設計兩個在次要使用者接收端最佳預編碼和主要使用者接收端的功率分離因子。然而，所考慮之最佳化問題為非凸優化問題，因此吾人提出一連串的等校優化問題，首先透過預編碼最佳化設計減少變數，證明出所考量之最佳化問題最後可以等效成半定規劃鬆弛凸優化問題，最後利用電腦軟體工具證明此頻譜與能量合作模式能提升效率。

In overlay hierarchical cognitive radio (HCR) networks, the primary system (PS) and the secondary system (SS) can cooperate to exploit the spectrum resource more efficiently. In this paper, we propose a new HCR, in which an energy harvesting (EH) device is additionally deployed at the primary receiver(PR) such that the PS can not only share the spectrum resources, but also harvest energy, achieving a new simultaneous wireless information and power transfer (SWIPT) paradigm. In the considered structure, the secondary base station (SB) can help relay PS’s signals via an amplify-and-forward (AF) protocol, and a power splitting EH device is adopted at the PR. A cooperative strategy is proposed for maximizing the efficiency of the information and power transfer. We optimize two precoders at the SB (for the PS and SS, respectively) and the power splitting factor for the PR. Since the optimization problem is nonconvex, it poses a significant challenge. To facilitate the optimization process, a precoding structure is first proposed to reduce the number of parameters. The resultant optimization problem can then be equivalently solved using a semidefinite relaxation (SDR) approach. Numerical results show that the proposed strategy provides a promising improvement for information and energy cooperation, as compared with existing methods.

論文審定書……………………………………….……………....i
中文摘要……………………….…………………………….......ii
英文摘要……………………………………………...……….....iii
目錄…………………………………………………...……….....iv
圖次………………………………………………………..……..v
第1章 導論……………………………………………………….1
第2章 系統模型……………………………………………… ...8
第2.1節 多天線覆蓋式感知網路架構……………...……….. 8
第2.2節 主使用者之無線充電與訊息接收描述…...………....10
第3章 結合訊息傳送與無線充電能量接收的傳收機設計.……14
第3.1節 最佳化問題描述…………………………………….14
第3.2次佳解推導…………………………………………… 15
第4章 系統模擬及探討………………………………………....21
第5章 結論與未來展望…………………………………………28
參考文獻………………………………………………………...29
附錄A……………………………………………………………33
附錄B…………………………………………………………….35
附錄C…………………………………………………………….37
附錄D…………………………………………………………….40

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