臺灣博碩士論文加值系統

無線都會網路 (Wireless Metropolitan Area Network) 是一個可適用於多元化傳輸資料型態的可攜式無線行動網路，對於涵蓋範圍(Coverage)、傳輸流通率(throughput)、彈性頻帶需求 (Bandwidth on demand) 有許多優勢。但其傳輸環境相較於無線區域網路 (WLANs) 勢必較為複雜，如多路徑衰減、都普勒效應、….等。本論文以IEEE802.16 實體層為基礎透過二位元格雷碼編碼搭配正交振幅調變 (Quadrature amplitude modulation, QAM) 的方式，建構出可以產生具有不同錯誤率與抗相位偏移能力的多個次通道，並在不同調變與編碼方式在各種傳輸環境下，分析其次通道的效能。本論文並提出方法改善都普勒偏移量的增加所帶來傳輸品質低落的問題。根據模擬結果，在多個次通道架構中，傳輸不同類型的資料，改善傳輸環境對系統效能的影響，達到提昇傳輸品質的目地。

WMANs(Wireless Metropolitan Area Networks) is a portable, wireless network that is favorably employed often used in wide-area transmission applications. Its advantages include wider coverage, higher throughput, and the flexible bandwidth on demand. Despite above advantages, the transmission environment of WMANs is much more complicated than that of WLANs(Wireless Local Area Networks), for example, dynamic multi-path fading and the Doppler effect. Based on the 802.16 specifications, this study proposes a new transmission scheme that combines the adaptive QAM and the characteristic of the binary Gray code to construct multiple sub-channels with different transmission quality respectively. Based on this scheme, we also analyze the capability of sub-channels under different modulation methods and channel coding in various transmission environment. In addition, we also propose an algorithm to improve the low quality of transmission caused by the Doppler Shift. The simulation results show our proposed algorithm can improve the transmission efficiency over various channel conditions and system parameters.

中文摘要 i
英文摘要 ii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1研究動機 1
1.2研究目的 1
1.3研究方法與內容 2
1.4各章提要 2
第二章 IEEE802.16系統 3
2.1 簡介 3
2.2 為何要發展無線大都會網路 4
2.3 IEEE802.16實體架構 5
2.4 IEEE802.16協定架構 6
第三章 位元映射特性分析 8
3.1 正交振幅調變 8
3.2 正交振幅調變各位元錯誤率分析 9
第四章 位元與相位關係 21
4.1 多路徑傳輸通道 21
4.2 選擇性衰減 21
4.3 都卜勒效應 22
4.4 相位與位元關係特性分析 22
第五章 實體層架構 27
5.1 隨機化 (randomization) 27
5.2前餽式錯誤更正 (Forward Error Correction, FEC) 28
5.3 交叉存取 (interleaving) 29
5.4 分級位元交錯 30
5.5 正交分頻多工基本觀念 30
5.6 正交分頻多工基本架構 32
5.7 保護區間 33
第六章 模擬結果分析 36
6.1研究方法 36
6.2 系統模擬工具 36
6.3系統建立與分析 38
6.3.1 16QAM系統與數據分析 39
6.3.2 64QAM系統與數據分析 51
6.3.3 正交分頻多工系統與效能分析 57
第七章 結論 64
參考文獻： 65

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