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研究生:陳又端
研究生(外文):You-Duan Chen
論文名稱:IEEE802.11a無線區域網路之正交分頻多工接收機的設計與模擬
論文名稱(外文):Design and Simulation of an OFDM Receiver for IEEE 802.11a Wireless LAN
指導教授:黃家齊黃家齊引用關係
指導教授(外文):Chia-Chi Huang
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:83
中文關鍵詞:802.11aOFDMWireless LANPacket DetectionCarrier Frequency Offset EstimaitonChannel Estimation
外文關鍵詞:802.11a正交分頻多工無線區域網路封包檢測載波頻率偏移估計通道估計
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為了要提供高速無線區域網路的需求,IEEE 802.11a標準被制定出來。它採用了OFDM的調變方式,所提供的資料傳輸速率為6Mbps~54Mbps。這篇論文將依據IEEE 802.11a標準內所規定的封包格式設計其基頻接收機架構,其中將包含封包檢測、符元時序估計、粗略及細微載波頻率偏移估計、通道估計、相位偏移估計及資料檢測等部份。每個部份將針對其運作原理及演算法做詳細的介紹,在每個部份中盡可能在性能表現及運算複雜度兩者間取一平衡點。為了驗證接收機的效能,我們針對不同的通道環境進行電腦模擬,模擬的內容包含每個部份的性能表現以及在不同條件下的BER和PER,探討出哪個部份對系統性能表現的影響最為嚴重,以便於日後要提升接收機性能時的依據。我們最後提出結論與未來的研究方向。

The IEEE 802.11a standard was defined in order to support the demand of high data rate WLANs. It adopts OFDM modulation and provides data rates from 6Mbps to 54Mbps. In this thesis, we propose an IEEE 802.11a baseband receiver architecture according to its specified packet format. The receiver includes several functional parts: packet detection, symbol timing estimation, coarse and fine carrier frequency offset estimation, channel estimation, phase offset estimation and data detection. We describe the operation principles and the algorithms of each part in details, and we try to make a good tradeoff between system performance and computational complexity. In order to verify the performance of the receiver, computer simulations are conducted under different channel conditions. Our simulation results include the performance of each functional part and the BER and PER of the whole system. From the simulation results, we can determine which parts are more critical to the whole system performance than others. Finally, we draw a conclusion and comment on possible future research directions.

第1章 簡介……………………………………………………………………1
1.1 無線區域網路(Wireless LAN)簡介 1
1.2 無線區域網路技術 2
1.3 無線區域網路運作模式[2] 3
1.4 無線區域網路標準之演變 5
1.5 關於本論文 5
第2章 OFDM系統之簡介 ……………………………………………………7
2.1 傳統單一載波傳輸與多載波傳輸之比較 7
2.2 OFDM系統 8
2.3 護衛間隔的放置 13
2.4 OFDM系統之優缺點比較 15
2.5 時序偏移與載波頻率偏移對OFDM系統的影響 15
2.5.1 時序偏移對OFDM系統的影響[6] 16
2.5.2 載波頻率偏移對OFDM系統的影響 18
第3章 IEEE 802.11a 實體層規格介紹 …………………………………20
3.1 IEEE802.11a系統之傳送及接收機方塊圖 20
3.2 傳輸訊號及碼框格式(Frame Format)介紹 22
3.2.1 傳輸速率及時序相關之參數介紹 22
3.2.2 PLCP Preamble 24
3.2.3 PLCP Header 25
3.2.4 Data 欄位 26
3.3 傳輸訊號之數學描述 26
3.4 迴旋編碼器 27
3.5 位元交錯器 28
3.6 次載波調變 28
3.7 次載波領航訊號 29
3.8 次載波位置對應 30
3.9 使用頻帶與通道配置(Channelization) 31
3.10 通道模型 32
第4章 IEEE 802.11a 系統接收機架構 …………………………………33
4.1 IEEE802.11a接收機架構圖 33
4.2 封包同步 35
4.3 粗略載波頻率偏移估計 39
4.4 符元同步 41
4.5 細微載波頻率偏移估計 45
4.6 通道估計 46
4.7 相位偏移估計 49
4.8 資料檢測 52
第5章 電腦模擬……………………………………………………………55
5.1 模擬環境 55
5.2 模擬結果與分析 58
第6章 結論與未來努力的方向……………………………………………75
附錄A IEEE 802.11a 標準操作SNR之推導……………………………76
附錄B IEEE 802.11a 接收機計算量之整理……………………………78
參考文獻 ……………………………………………………………………81
個人簡歷 ……………………………………………………………………83

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