臺灣博碩士論文加值系統

超高頻無線射頻辨識系統，因受到多重路徑衰減的影響，導致系統效能降低。本論文提出符合台灣超高頻無線射頻辨識操作頻段規範之925MHz反向散射分集射頻辨識系統，以改善此問題。
該系統由具反向散射分集之標籤和其對應之讀取器組成。在順向鏈結方向(由讀取器到標籤)，標籤使用選擇性合併技術來改善效能；反向鏈結方向(由標籤到讀取器)，標籤使用空-時區塊編碼回傳訊號，讀取器利用最大比合併技術得到分集增益，以改善多重路徑衰減的問題。
此外考慮軟體無線電平台之複雜度限制，本論文對讀取器提出新的設計架構，改善先前文獻之標籤讀取錯誤率。

The multi-path fading problem causes Ultra High Frequency (UHF) Radio Frequency Identification (RFID) system performance degradation. To overcome this problem, a 925MHz RFID system with backscatter diversity that complies with Taiwan regulations is proposed in this thesis.
The proposed system is composed of RFID tag with backscatter diversity and its corresponding reader. In the forward (Reader to tag) link, the RFID tag uses selective combining technique to improve its performance. In the reverse (Tag to reader) link, the tag backscatters space-time block coded signals, and the reader uses maximum ratio combining technique to obtain diversity gain to mitigate the multi-path fading problem.
In addition, considering the complexity limit of the software defined radio platform that used in this thesis, a reader with new design, which has higher tag read rate than its preceding design, is proposed.

摘要 I
ABSTRACT II
致謝 III
目錄 IV
圖目錄 VI
表目錄 VIII
第1章 序論 1
1.1 研究動機與目的 1
1.2 章節概述 2
第2章 文獻回顧 3
2.1 多重路徑衰減之對抗－分集與合併 3
2.1.1 分集技術 ( Diversity ) 4
2.1.2 合併技術(Combining) 5
2.2 延遲編碼 7
2.3 軟體定義無線電 8
2.3.1 SFF SDR發展平台 9
2.4 雙天線射頻辨識標籤介紹 12
2.4.1 標籤回傳訊號編碼與原理 12
2.4.2 標籤架構介紹 16
2.5 雙天線射頻辨識標籤之讀取器介紹 18
2.5.1 文獻[8]所提之傳送端設計 18
2.5.2 文獻[8]所提之接收端設計 19
第3章 925MHz之雙天線射頻辨識標籤系統 24
3.1 925MHz之雙天線射頻辨識標籤 24
3.1.1 傳送訊號編碼與負載阻抗設計原理 25
3.1.2 925MHz之負載阻抗與匹配電路實做 29
3.1.3 925MHz偶極天線實做 32
3.2 925MHz之雙天線射頻辨識標籤之讀取器 35
第4章 實驗量測與分析 40
4.1 微波無反射實驗室量測實驗 40
4.2 會議室量測實驗 47
4.2.1 順向鏈結量測實驗 47
4.2.2 反向鏈結量測實驗 55
第5章 結論與未來研究方向 58
參考文獻 60

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