近年來，為了增加頻譜的使用效率，全雙工的中繼點常被使用在合作式通訊系統上。由於全雙工中繼點會在同一時間傳送與接收訊號，中繼點的接收端會收到來自於本身所傳送的訊號，稱之為自相干擾。到目前為止，一些較新的技術像是時域上的干擾消除或是空間上的干擾抑制，都直覺地把自相干擾當作一種有害的訊號給消除掉。但事實上，在合作式通訊系統當中，全雙工中繼點的自相干擾也可以看作是一個延遲後的有用信號，因此，自相干擾之效果就可以視為一種無限脈衝響應之濾波器。在這篇論文當中，我們不把中繼點的自相干擾當作一種有害的訊號，而是在中繼點設計一個與自相干擾有關的中繼無限響應脈衝濾波器。根據目地端之不同型態之線性與非線性接收機，考量瞬時通道狀況，吾人整合設計相對應接收機之訊號源與中繼點之濾波器。由於所設計問題為非凸最佳化，在有限的硬體限制下難以找出最佳設計，因此吾人提出一種疊代的方式，將原本最佳化問題分成兩個子問題，由兩個子問題互相疊代求解，其中一個子問題固定中繼濾波器，計算最佳訊號源濾波器，而另一個子問題則固定訊號源濾波器，最佳化中繼點濾波器。由模擬結果可以驗證所提出之結合式濾波器確實可以有效抑制自相干擾之影響，有效等化頻率選擇性衰減通道及自相干擾所組成的整體通道。

Recently, the full-duplex (FD) relays are carried forward to the cooperative systems to enhance the spectral efficiency. However, the FD relays incurs the self-interference due to simultaneously transmitting and receiving the signals at the relay nodes. State of the art designs all address the time-domain cancellation or the spatial suppression to mitigate the influence of the self-interference which is inherently treated as a harmful interference signals. In the cooperative systems, the self-interference of the FD relays is essentially the desired delayed signals. Hence, the relays with the self-interference can be modeled as a filter of infinite impulse response (IIR). In this paper, rather than treating the loop back self-interference as the harmful signal, we model the relay filter and the self-interference as a composited IIR filter. The composited IIR filter are jointly optimized with the source filter and the corresponding linear/nonlinear receivers by considering the responses of all the channel links. Since the optimization is not convex, finding the optimum solution is difficult. We then propose an iterative approach to iteratively solve the source and the composited relay filters separately. The closed-form solutions can then be easily obtained. Numerical results show the superiority of the proposed design which effectively equalizes the overall channel impulse response resulted from the frequency selective channels and the self-interference.

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
表次……………………………………………………………...................................vii
第1章 序言…………………………………………..................................................1
第2章 系統模型...................……………............................................................7
第2.1節 全雙工中繼點模型………………………………...………..............……....…7
第2.2節 頻域系統模型…………………………………….……………...…………....…9
第3章 最佳濾波器設計....................................................................................12
第3.1節 線性與非線性等化器…………………………...………..............……....…..12
第3.2節 最佳化問題描述………………………………….……………...…………......13
第3.3節 濾波器設計………………………………….……………...………….............17
第4章 系統模擬及探討……………………….......................................................19
第5章 結論與未來展望……………………….......................................................23
參考文獻……………………………………………….............................................24
附錄A……………………………………………….................................................27
附錄B……………………………………………….................................................29

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