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系統識別號 U0026-2107202019481100
論文名稱(中文) 以軟體定義無線電技術分析數位無線電視頻段之干擾
論文名稱(英文) Interference Analysis of Digital Wireless Television Spectrum using Software Defined Radio
校院名稱 成功大學
系所名稱(中) 電信管理研究所
系所名稱(英) Institute of Telecommunications and Management
學年度 108
學期 2
出版年 109
研究生(中文) 王紫瑜
研究生(英文) Tzu-Yu Wang
學號 R96074050
學位類別 碩士
語文別 中文
論文頁數 54頁
口試委員 指導教授-陳文字
口試委員-林珮珺
口試委員-林福林
口試委員-林易泉
中文關鍵字 軟體定義無線電  GNURadio  DVB-T  同頻干擾  鄰頻干擾 
英文關鍵字 Software Defined Radio  GNURadio  DVB-T  co-channel interference  adjacent-channel interference 
學科別分類
中文摘要 隨著全球行動上網的需求以及網路流量不斷地上升,以及電信、電視、廣播、衛星、5G等應用,造成頻譜的需求擴大,而TV White Space(TVWS)共享技術便是將頻譜使用做最佳化運用的一個方法,TVWS是在電視廣播服務數位化後,由原先類比訊號所空出的頻段。在不影響原有無線數位電視訊號的前提下,這些未使用的頻段可以提供類似Wi-Fi、藍芽等無線網路裝置使用,且不需要執照,而這些裝置必須遵守相關的無線網路協定,包括IEEE 802.11af以及IEEE 802.22等。本研究透過軟體定義無線電(Software Defined Radio;SDR)實作一個測試干擾的實驗平台,使用RF設備USRP B200 mini來發射及接收訊號。本實驗以DVB-T (Digital Video Broadcasting-Terrestrial)作為實驗的受害者,在軟體內利用加法器來同時接收干擾源及解調預錄檔,並發射一個符合IEEE 802.11af標準的干擾源。在同頻干擾方面,固定干擾源的中心頻率並調整其增益值(gain),測試不同干擾訊號強度對DVB-T的影響;在鄰頻干擾方面,固定干擾源的增益值並調整其中心頻率,測試在DVB-T及干擾訊號間不同頻譜位移(frequency offset)需要預留的保護頻寬(guard band)。實驗結果以64QAM星座圖以及FFT頻譜圖觀察受害者被干擾的程度,並以VLC媒體撥放器觀看DVB-T解調變後的節目影片,最後以節目影片的音訊遺失數、視訊遺失數及輸入丟棄數來判斷節目影片受干擾的程度,由實驗結果可以發現,干擾源之訊號強度越強則影響節目影片之品質越大,而頻譜位移小於3MHz時會開始影響節目影片之品質。本研究透過設計GNURadio上的模組實現一個可測試干擾的實驗平台,不僅節省許多成本,也體現了SDR其運用的靈活度。
英文摘要 With the increasing demand of global mobile Internet and wireless communications, TV white space (TVWS) sharing technology is a way to optimize the use of spectrum. TVWS is the frequency band vacated by the original analog signal after the digitalization of TV broadcasting services. Without affecting the original wireless digital TV signal, these unused frequency bands can be used by wireless network devices such as Wi-Fi, Bluetooth, etc. This kind of spectrum usage does not require a license. However, these radio devices must comply with the relevant wireless network protocols, including IEEE 802.11af and IEEE 802.22. In this study, software-defined radio technology is used to implement an experimental platform for testing interference, and the RF equipment USRP B200 mini is used to transmit and receive signals. This experiment takes DVB-T as the victim of radio communication. On the other hand, we have an interference source that complies with the IEEE 802.11af standard. For co-channel interference, we fix the center frequency of the interference source and adjust its gain to test the effect of different interference signal strengths on DVB-T. For adjacent-channel interference, we fix the gain of the interference source and adjust its center frequency for the purpose of finding the guard band that need to be reserved for different frequency offsets between DVB-T and interference signals. The experimental results use 64QAM constellation diagram and FFT spectrum diagram to observe the degree of victim's interference, and use VLC media player to observe the DVB-T demodulated program video. Finally, the number of audio loss, video loss, and the number of discards to determine the degree of interference of the program video. From the experimental results, it can be found that the stronger the signal strength of the interference source, the greater impacts on the quality of the program video. The frequency offset of less than 3MHz will begin to affect the quality of the program video. This study realized an experimental platform that can test interference by designing modules on GNURadio, which not only saves a lot of costs, but also reflects the flexibility of SDR in its application.
論文目次 表目錄 IX
圖目錄 X
第一章 緒論 1
1.1 研究背景與動機 1
1.2 研究目的 3
1.3 論文組織 3
第二章 文獻回顧探討 5
2.1 TV WHITE SPACE介紹 5
2.1.1 TVWS技術及架構 6
2.1.2 TVWS各國標準 8
2.2 DVB-T系統 11
2.2.1 DVB-T系統介紹 11
2.2.2 正交分頻多工(OFDM) 12
2.2.3 軟體定義無線電 16
2.3 無線網路相關協定 18
2.3.1 IEEE 802.11af 18
2.3.2 IEEE 802.22 19
2.3.3 IEEE 802.11af 與IEEE 802.22之比較 20
2.4 DVB-T頻段干擾之相關文獻 20
第三章 研究架構 23
3.1 實驗架構 23
3.1.1 同頻干擾 24
3.1.2 鄰頻干擾 25
3.2 硬體裝置介紹 27
3.2.1 USRP技術規格 27
3.2.2 電腦規格 29
3.3 軟體架構 30
3.3.1 GNU Radio 30
3.3.2 DVB-T系統設計 32
3.3.3 接收端模組設計 33
3.3.4 DVB-T系統運作流程 35
3.3.5 發射端模組設計 36
3.3.6 實驗參數 36
第四章 研究結果 38
4.1 星座圖及FFT觀察 40
4.2 影片清晰度觀察 41
4.2.1 同頻干擾 42
4.2.2 鄰頻干擾 43
4.3 實驗數據 45
4.3.1 同頻干擾 45
4.3.2 鄰頻干擾 48
第五章 結論 51
5.1 同頻與鄰頻干擾的影響 51
5.2 軟體定義無線電用於干擾研究之可行性 51
5.3 研究限制 51
5.4 未來研究建議 52
參考文獻 53
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