博碩士論文 105523032 詳細資訊




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姓名 羅仕安(Shih-An Lo)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 基於軟體定義無線電之全雙工中繼解碼轉發系統設計與實現
(Design and Implementation of Full-Duplex Decode-and-Forward Relay Systems Utilizing Software-Defined Radio)
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摘要(中) 由於全雙工通訊系統擁有同時同頻帶傳送和接收的能力,理論上與傳統半雙工系統相比可使頻譜效率加倍。然而全雙工收發器的效能表現因自干擾而有所限制,如何克服自干擾問題將是個挑戰。
此篇論文中,吾人提出包含隨機梯度下降法和遞迴最小平方法兩種最小化功率數位自干擾消除演算法之數學模型與模擬,將可應用於全雙工中繼解碼轉發系統。演算法模擬結果顯示其效果可適應性地估計出多路徑自干擾通道狀態並消除自干擾訊號。
接著,吾人使用 Zynq-7000 + AD9361 軟體定義無線電平台實現基於 LTE 下行標準之全雙工中繼系統原型。此外,在中繼端類比射頻部分使用方向天線做被動抑制和兩種最小化功率演算法做數位自干擾消除。所提出的方法總體自干擾消除效果可達 55 dB。此篇論文中的研究與應用可作為全雙工中繼解碼轉發通訊系統之原型實例。
摘要(英) Due to the capability of transmitting and receiving signals at the same time on the same frequency band, full-duplex communication systems can theoretically double the spectral efficiency, as compared with the conventional half-duplex systems. However, the performance of a full-duplex transceiver is limited by the inherent self-interference. Thus, how to overcome the self-interference problem becomes a challenging issue in successfully realizing the full-duplex communication systems.
In this thesis, we first present the mathematical system models for full-duplex relay communications with the decode-and-forward protocol, and design two digital self-interference cancellation algorithms, including stochastic gradient descent and recursive least square, based on the idea of minimizing the average received power after the self-interference. The resultant algorithms can adaptively estimate the self-interference channel with multipaths and successfully cancel the self-interference signals to a sufficiently low level.
Next, we use a Zynq-7000 + AD9361 software-defined radio platform to implement the full-duplex relay system prototype based on the long-term evolution (LTE) downlink standard. In addition, directional antennas are used at the relay node for passive self-interference suppression in the RF analog part, and the two proposed digital self-interference cancellation algorithms are implemented at the relay node. Throughout real experiments, it demonstrates that the proposed scheme can achieve the self-interference cancellation up to 55 dB in total. The proposed design methodology in this thesis could be served as a prototype for the development of full-duplex decode-and-forward relay communications.
關鍵字(中) ★ 全雙工
★ 自干擾
★ 中繼網路
★ 解碼轉發
★ 軟體定義無線電
關鍵字(英) ★ Full-Duplex
★ Self-Interference
★ Relay
★ Decode-and-Forward
★ Software-Defined Radio
論文目次 摘要 i
ABSTRACT ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
符號說明 ix
第一章 緒論 1
1.1 研究動機 1
1.2 背景簡介 2
1.2.1 雙工 2
1.2.2 中繼網路 6
1.2.3 軟體定義無線電 8
1.3 文獻探討 9
第二章 系統架構 11
2.1 中繼端自干擾接收模型 11
2.2 目的端接收模型 12
第三章 數位自干擾消除演算法 13
3.1 隨機梯度下降法 (Stochastic Gradient Descent) 14
3.2 遞迴最小平方法 (Recursive Least-Squares) 15
第四章 演算法模擬結果與討論 20
第五章 軟體定義無線電平台設計與實現 28
5.1 硬體平台介紹 28
5.2 傳送訊號架構 31
5.3 實驗測試 34
5.3.1 中繼端自傳自收實驗結果 35
5.3.2 全雙工中繼節點系統實驗結果 38
第六章 結論 45
附錄 46
附錄A 46
附錄B 47
參考文獻 48
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指導教授 古孟霖(Meng-Lin Ku) 審核日期 2018-10-11
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