臺灣博碩士論文加值系統

本論文提出一個改進的軟體定義無線電(Software-defined Radio, SDR)平台。而SDR的精神就是在數位無線通訊的訊號處理模組串上，將軟體與硬體的分水嶺盡可能地靠近天線，使得更多的處理模組都交由軟體來實現，進而提高系統對無線電訊號的調整能力。本平台可以偵測周圍環境的無線電資訊，並將其作為斷線時如何重新連線之自動判斷的依據，以保持連線暢通並提升了連線品質與穩定性。本平台除了提供基本的頻譜掃描(Frequency Spectrum Sensing)、頻道切換(Channel Switching)、自動斷線重新連線(Automatic Reconnection)、動態調整(Dynamic Reconfiguration)等功能之外，我們還進一步的在自動斷線重新連線的機制、頻道搜尋速度、資料傳輸速率以及傳輸的反應延遲上做了不少的改進。之後在實驗中，我們也確定了本平台能夠順暢而穩定地相互傳輸文字、檔案、即時音訊與視訊串流，讓此平台的能力更為趨向感知無線電(Cognitive Radio, CR)的基礎要求。換句話說，我們提出了一個擁有高彈性度(Flexibility)與可重組能力(Reconfigurability)的數位無線通訊平台。

In this thesis, we proposed an improved Software-defined Radio (SDR) platform. The ideal concept of SDR is digitizing the radio signal as possible as close to the antenna. This platform has capability to sensing the radio situations of surrounding environment, and then uses them to decide how to reconnect the network automatically when losing the connection, such that the network connecting freely between different channels, and results in a stable and robust quality of wireless communication. Basically, this platform can supply the essential Cognitive Radio (CR) features, such as the frequency spectrum sensing, the channel switching, the automatic reconnection and the dynamic reconfiguration. Furthermore, we had done much improvement, like the automatic reconnection method, the channel searching performance, the data transfer rate and the transmission delay. In our experiment we make sure that our platform could transfer text, file and real-time audio/video stream smoothly to ensure our SDR platform is more close to the goals and requirements of CR. So, we presented the high flexibility and reconfigurability of our platform.

摘要
Abstract
致謝
目次
圖次
表次
第1章、緒論
1.1 研究背景
1.2 研究動機
1.3 研究方法
1.4 論文架構概述
第2章、軟體定義無線電
2.1 SDR的演進
2.2 CR的演進
2.2.1 CR人工智慧系統的分類
2.3 SDR與CR的關連
2.4 SDR的軟體架構
2.5 SDR的硬體架構
2.6 SDR平台設計
第3章、SDR平台的實現與改進
3.1 GNU Radio與USRP的簡介
3.1.1 GNU Radio的簡介
3.1.2 GNU Radio的軟體架構
3.1.3 USRP的簡介
3.1.4 USRP的傳輸限制
3.2 SDR平台的軟體設計
3.2.1 系統運作流程
3.2.1.1 斷線的判定規則
3.2.1.2 自訂的封包格式
3.2.1.3 碰撞避免
3.2.1.4 通訊設定項目
3.2.2 自動頻道切換功能
3.2.3 自動頻道切換方式
3.3 SDR平台的改進內容與方法
3.3.1 資料傳輸速率
3.3.2 傳輸的反應延遲
3.3.3 自動斷線重新連線的機制
3.3.3.1 有限狀態機
3.3.3.2 頻道能量值的排序方式
3.3.3.3 頻道能量值的精確度
第4章、SDR平台的驗證與改進成果
4.1 實驗環境
4.2 圖形操作介面
4.2.1 圖形介面
4.2.2 操作方式
4.2.3 系統資訊查詢
4.3 SDR平台的功能驗證與改進成果
4.3.1 利用Ping驗證功能與改進成果
4.3.2 利用聊天室驗證功能與改進成果
4.3.3 利用FTP驗證功能與改進成果
4.3.4 利用Audio Stream驗證功能與改進成果
4.3.5 利用Video Stream驗證功能與改進成果
第5章、結論
參考文獻
附錄

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