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研究生:黃志翔
研究生(外文):Chih-Hsiang Huang
論文名稱:於全雙工中繼系統中整合來源編碼與通道效應之最佳化設計
論文名稱(外文):Joint Source-Channel Optimization over Full-Duplex Amplify-and-Forward Relay Systems
指導教授:曾凡碩
指導教授(外文):Fan-Shuo Tseng
學位類別:碩士
校院名稱:國立中山大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2016
畢業學年度:105
語文別:中文
論文頁數:56
中文關鍵詞:全雙工中繼系統選擇性中繼系統放大後傳送累進式階層傳輸結合來源編碼與通道效應
外文關鍵詞:Full-duplex relayselective relayamplify-and-forwardprogressive layered transmissionjoint source and channel coding
相關次數:
  • 被引用被引用:0
  • 點閱點閱:203
  • 評分評分:
  • 下載下載:4
  • 收藏至我的研究室書目清單書目收藏:0
合作式通訊可以有效地擴展小區覆蓋範圍和提高無線通訊系通的鏈結穩定度。為了達到空間分集,可以使用多個中繼端以分佈式的方式來部署。若採用選擇性中繼的方案,可以進一步降低傳輸路徑的數量。然而,由於硬件限制,傳統的中繼端使用半雙工系統,在放大後傳送或解碼後傳送的協定下,來協助訊號源傳送它的數據訊號。在半雙工中繼系統中,每一個數據訊號的傳送需要兩個階段,分別為中繼端的收聽和傳送。為了提高傳輸效率,發展了全雙工中繼端,可以同時接收和傳送訊號源到目的地。然而,中繼端即便使用類比或數位的消除技術仍無法避免自我干擾的產生。不可避免地,自我干擾影響系統的執行並且會降低系統性能。為了提高接收訊號的品質,發明了連續分層來源傳輸,將多媒體訊號編碼成多個階層,並且可以藉由依次接收較多進階層的訊號來提高效能表現,以補救端點間不良通道鏈結所造成的影響。在本文,我們在選擇性全雙工中繼系統中,研究漸進式分層傳輸。考量通道品質的統計特性和自我干擾的影響,我們藉由選擇適當的中繼端和優化不同的編碼層中的速率和功率,來最小化多媒體重建訊號的均方誤差。由於這方面的優化是棘手的,所以我們在高訊雜比的區域提出了一個接近均方誤差效能的解析解表示式,藉由我們所提的近似法,我們可以有技巧性的找到次佳的解。透過電腦模擬可知,我們所提出選擇性全雙工中繼系統的設計可以超越現有的半雙工中繼系統。
Cooperative communication is developed to effectively extend the cell coverage and improve the link reliability in a wireless communication system. To achieve the spatial diversity, the multiples relays can be deployed in a distributed manner. The relay selection schemes can be adopted to further reduce the number of transmission phase. However, owing to the hardware limitation, the conventional relays use half-duplex (HD) to help the source convey its data signal in either amplify-and-forward (AF) or decode-and-forward (DF) protocols. In HD relay systems, transmission of each data signal needs two phases for relays listening and transmitting, respectively. To improve the transmission efficient, the full-duplex relays are developed to simultaneously receive and transmit the source signal to the destination. Nevertheless, the self-interference (SI) is unavoidable at the relay even if the analog or digital cancellation techniques are utilized. Inevitably, the SI affects the system implementation and degrades the performance. To provide higher quality of received signals, the successive layered source transmission is invented to encode the multimedia signals into multiple layers and the performance can be improved by successively receiving more signals of advanced layers, remedying the influence due to poor end-to-end channel links. In this thesis, we study the progressive layered transmission in selective FD relaying systems. Considering the statistics of the channel quality and the influence of SI, we minimize the MSE of the reconstructed multimedia signals by jointly selecting a proper relay and optimizing the rate and power for different encoded layers. Since the optimization is intractable, we propose a closed-form expression to approach the MSE performance the high SNR region. With the proposed approximation, we can sophisticatedly search a suboptimal solution. By the computer simulation, the proposed design in selective FD relay systems can outperform the existing HD relay systems.
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章導論…………………………………………………………1
第2 章 階層式來源訊號傳輸型式…………………………………....8
第2.1節 傳送模式描述…………………………………...………..……8
第2.2節 校能分析……………………………………………..……….9
第3章 全雙工中繼系統………………………………….…………………12
第3.1節 系統模型………………………………………...………..…12
第3.2節 接收信號模型……………………………………………..….13
第3.3節 中斷機率……………………………………………...…….…15
第4章 結合來源編碼通道效應最佳化…………………………………16
第4.1節 累進式來源編碼傳輸………………………………………….16
第4.2節 最佳化問題描述………………………………………………17
第4.3節 最佳解計算…………………………………………………….18
第5章 系統模擬及探討……………………………………………………………25
第6章 結論與未來展望……………………………………………………………31
參考文獻……………………………………………………………………………32
附錄A……………………………………………………………………………36
附錄B……………………………………………………………………………37
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