臺灣博碩士論文加值系統

本論文是探討在認知無線電 (Cognitive Radio, CR) 應用於無線局域網路 (Wireless Regional Area Network, WRAN) 系統架構下，對數位電視頻帶所進行的頻譜偵測訊號分析，並依照 IEEE 802.22 標準所規範可在此電視頻帶上傳輸的訊號進行偵測，而本論文提出的流程為1.能量偵測；2. ATSC訊號偵測；3. WRAN訊號偵測；4. ATSC加上WRAN訊號混合偵測，藉由以上四種偵測，產生各個機率判斷值，進行決擇此通道是否有訊號存在，且為何種訊號存在，藉此了解通道使用狀況。

誌謝 III
摘要 V
圖目錄 VII
表目錄 XI
變數列表 XIII
縮寫對照表 XV
第一章 導論 1
1.1 研究動機 1
1.2 文獻探討 1
1.3 論文架構 4
1.4 基礎知識 4
1.4.1 IEEE 802.22 (WRAN) 標準簡介 4
1.4.2 認知無線電 (Cognitive Radio, CR) 簡介 6
第二章 感測頻帶環境 9
2.1 WRAN頻帶利用情形 9
2.2 共用頻帶的訊號 13
第三章 動態頻率跳頻 19
3.1 簡介 19
3.2 動態跳頻社區 (Dynamic Frequency Hopping
Community, DFHC) 19
3.2.1 DFHC管理方式 19
3.2.2 DFHC運作原理 21
第四章 訊號偵測 29
4.1 接收端架構 29
4.2 接收訊號強度指標 (Received Signal Strength
Indicator, RSSI) 31
4.3 WRAN訊號偵測 33
4.4 ATSC訊號偵測 45
4.4.1 IEEE 802.22標準的ATSC感測 45
4.4.2 數據段同步偵測 ( Data Segment Synchronization) 46
4.5結果與討論 61
4.5.1 接收訊號強度指標偵測 61
4.5.2 WRAN訊號偵測 63
4.5.3 ATSC訊號偵測 65
第五章 混合訊號偵測 69
5.1 ATSC與WRAN混合訊號偵測 70
5.2 結果與討論 85
第六章 整體訊號偵測 95
6.1 訊號相對分布 95
6.2 整體訊號偵測 99
6.2.1偵測流程 99
6.2.2偵測判斷式 102
6.3 結果與討論 111
第七章 結論與未來工作 119
附錄A WRAN的 平均值與變異數 121
附錄B ATSC的 平均值與變異數 135
附錄C混合訊號 的平均值與變異數 151
附錄D複數高斯聯合機率密度函數 169
參考文獻 173

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