階層式感知無線電網路已發展至可改善頻譜之使用效率。藉由將若干使用者區分為主要使用者及次要使用者，當主要使用者不使用通道或次要使用者不嚴重干擾主要使用者之情況下，主要使用者可與次要使用者共享頻譜資源。近來，無線功率轉換技術於不同的階層式感知無線電網路之應用其可帶來不同的頻譜及能量合作策略。當主要使用者配置一時間交換之能量擷取元件，一方面主要使用者可提供頻譜資源給予次要使用者，而另一方面次要使用者則可傳送無線能量給予主要使用者。波形束賦技術之採用可更進一步地改善能量擷取及資訊回復之效率。然而，由於不完美之通道資訊，波形束賦其效能之實現實際上可能會衰減。
於本論文中，基於不完美通道中，受限於機率中斷條件之次要使用者傳輸率最大化問題，吾人提出一個新的頻譜及資訊合作策略。具體而言，吾人在次要使用者傳送端同時設計時間交換因子及其波形束賦，因此，當給定一中斷機率時，可將次要使用者傳輸率最大化並同時可保證主要使用者其中斷機率及所擷取之能量值。然而，原本所考慮之最佳化問題其數學形式難以處理。因此，吾人藉由Bernstein型不等式方法將最佳化問題簡化。據此，原問題最後將可改寫為半正定規劃問題之形式且可由cvx tool 得到較保守之近似解。模擬結果與吾人所提之設計相符合。

Hierarchical cognitive radio (HCR) networks are developed to improve spectrum utilization. By classifying the users into primary users (PU) and secondary users (SU), the PUs share the spectrum resource with the SUs as the PUs do not use channel or the SUs do not seriously interfere the primary receiver (PR). Recently, the wireless power transfer (WPT) techniques applied in different HCR networks can bring different spectrum and energy cooperation strategies. When the PR is equipped with a time switching energy harvesting (EH) device, the PU can offer the spectrum resource to the SU and the SU is able to radiate wireless energy to the PR in return. The beamforming techniques can be further adopted to improve efficiency of the EH and information retrieving. However, the performance may be practically degraded due to the imperfect channel state information (CSI) used for implementing the beamformer. In this thesis, we propose a novel spectrum and information cooperation strategy based on an outage-constrained secondary user’s (SU’s) rate maximization problem in the presence of imperfect CSI. Specifically, we jointly design a time switching factor and the beamformer at the secondary transmitter so that the SU’s information rate is maximized with a given outage probability, and meanwhile the requirements of the outage probability and the EH of the primary user (PU) are guaranteed. However, the considered optimization problem is originally intractable to be solved. Therefore, we resort to the Bernstein-type inequality method to simplify the optimization problem. Accordingly, the problem can be finally formulated as semidefinite programming problem (SDP) and conservatively approximate solutions are obtained by cvx tool. The simulation results validate our proposed design.

論文審定書……………………………………………………………..………………..i
誌謝……………………………………………………………..……..………………...ii
中文摘要……………………….……………………………………..………………...iii
英文摘要………………………………………………………..…………...……….....iv
目錄……………………………………………………………..…………...………......v
圖次……………………………………………………………….……………...……..vi
第1章 導論…………………………………………………………..1
第2章 系統模型……………………………………………………....7
第2.1節 不完美通道模型……………...………..……7
第2.2節 多天線交織型無線充電與訊息接收感知網路架構……………... ………………………………………..……9
第3章 交織型強韌式無線充電與訊息接收設計.…………13
第3.1節 問題描述…………………………………………………….13
第3.2節 最佳解推導…………………………………………………….14
第4章 系統模擬及探討………………………………………………………………17
第5章 結論………………………………………………………………………23
附錄A…………………………………………………………………………………..24
參考文獻……………………………………………………………………………….27

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