在網路傳輸中，使用多個中繼端可以拓展傳輸覆蓋範圍，提高連結品質。然而，由於硬體上的限制，導致現今的合作式通訊系統都是使用半雙工中繼傳輸。因為半雙工中繼端傳輸時需要用到兩個時相，將造成頻譜效益降低。因此，最近開發了全雙工中繼系統來進一步提高頻譜效率。可是全雙工系統的中繼端因為同時發送與接收訊號而互相干擾。所以為了緩和自相干擾，我們在放大轉發多個中繼端時，設計結合來源編碼與通道，其中把多媒體的來源信號通過分層疊加編碼進行編碼，並使用了中繼端選擇策略來減少干擾的影響。具體來說，我們共同選擇了一個全雙工中繼端利用統計通道信息以及自相干擾的知識，優化不同編碼層的功率和傳輸速率，來使重建的多媒體信號的均方誤差最小化。由於均方誤差的公式最佳化非常複雜，所以不太可能直接對其做最佳化設計。於是我們接著去推導出一個近似均方誤差的解析解公式，精密地分析搜索出次佳解，並利用模擬來驗證我們所提出的設計。結果也表明了，我們所提出的分層疊加編碼優於其他的分層多媒體傳輸。

Deploying multiple relays in a network is able to extend the transmission coverage and to improve the link quality. However, owing to the limitation of hardware, the conventional cooperative system adopts the half-duplex relays to convey the signals to destination. Since the half-duplex (HD) relays transmit a signal with two phases, the spectral efficiency is degraded. Therefore, the full-duplex (FD) relays are recently developed to further increase the spectral efficiency. However, the FD relays suffer from self-interference (SI) due to transmit and receive at the relays concurrently. To alleviate the influence by SI, we jointly design a source and channel coding in an amplify-and-forward multiple relays where a multimedia source signals are encoded by layered superposition coding and the relay selection strategy is used. Specifically, with the knowledge of statistical channel information and the SI, we jointly select a FD relay and optimize the power and transmission rate for different encoded layers to minimize the mean squared error (MSE) of the reconstructed multimedia signals. Since the formulation of MSE is complicated in the optimization, the optimum design is not possible. We then derive an approximated MSE of a closed-form formulation to sophistically search a suboptimum solution. Simulations are conducted to verify the proposed design and the results show that the proposed layered superposition coding outperforms than the other layered multimedia transmission.

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……………………………………………………………...................................vi
第1章導論…………………………………………………………1
第2 章 階層式來源訊號傳輸型式…………………………....7
第2.1節 傳送模式描述…………………………………...………..……7
第2.2節 效能分析……………………………………………..……….8
第3章 全雙工中繼系統………………………………….…………………11
第3.1節 系統模型………………………………………...………..…11
第3.2節 接收信號模型……………………………………………..….12
第3.3節 中斷機率計算……………………………………...…….…14
第4章 結合來源編碼通道效應最佳化…………………………………15
第4.1節 重疊編碼來源編碼傳輸…………………………………….15
第4.2節 最佳化問題描述………………………………………………16
第4.3節 最佳解計算…………………………………………………….18
第5章 系統模擬及探討……………………………………………………………26
第6章 結論與未來展望……………………………………………………………29
參考文獻……………………………………………………………………………30
附錄A……………………………………………………………………………34
附錄B……………………………………………………………………………35

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