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研究生:蘇英凱
研究生(外文):Ying-Kai Su
論文名稱:IEEE802.11b無線區域網路收發機之演算法設計及效能評估
論文名稱(外文):Algorithm Design and Performance Evaluation of IEEE 802.11b Wireless LAN Transceiver
指導教授:李大嵩李大嵩引用關係
指導教授(外文):Ta-Sung Lee
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:2002
畢業學年度:90
語文別:中文
論文頁數:91
中文關鍵詞:互補碼鍵封包二元迴旋碼快速華許轉換犁耙接收機後標記多路徑消除法
外文關鍵詞:Complementary Code KeyingPacket Binary Convolutional CodingFast Walsh TransformRAKE receiverPost-Cursor Multipath Cancellation
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在多媒體通訊中,提供高速資料傳輸服務的需求日漸增加。因此,使用操作於2.4 GHz ISM頻段之IEEE 802.11b無線區域網路(Wireless Local Area Network, WLAN)將成為未來之重要趨勢。IEEE 802.11b可同時提供分別為1 Mbps、2 Mbps、5.5 Mbps及11 Mbps的傳輸率。為了滿足多媒體高速傳輸之要求,所使用的調變技術分別為互補碼鍵(Complementary Code Keying, CCK)與封包二元迴旋碼(Packet Binary Convolutional Coding, PBCC)。在本論文中,吾人將介紹互補碼鍵解調器,如相關器(correlator)與快速華許轉換(Fast Walsh Transform, FWT),並討論兩者之間的差異性。在多重路徑(multipath)環境下,吾人將利用前置訊號與單週期虛擬雜訊序列相關性估測之方法估測出通道脈衝響應(channel impulse response)。接著,吾人以估測出之通道脈衝響應分別作為犁耙接收機與後標記多路徑消除法(Post-Cursor Multipath Cancellation)之權值,以提升整體系統效能。

There is an increasing demand for high data rate services in multimedia communication. To this end, wireless local area networks operated in the 2.4 GHz ISM band such as IEEE 802.11b will be a future trend. IEEE 802.11b provides four kinds of data rate: 1 Mbps, 2 Mbps, 5.5 Mbps and 11 Mbps. In order to satisfy high data rate transmission, it uses the Complementary Code Keying (CCK) and Packet Binary Convolutional Coding (PBCC) as its modulation scheme. In this thesis, we will introduce two kinds of CCK demodulators, correlator and Fast Walsh Transform (FWT), and then investigate their difference. In multipath environments, we will estimate the channel impulse response using the preamble based method and single period correlation of pseudo noise. We then use these estimated channel coefficients as the weights for the RAKE receiver and Post-Cursor Multipath Cancellation to enhance overall system performanc

第一章 緒論 1
第二章 IEEE 80.11b 實體層(Physical Layer) 4
2.1 PPDU訊框架構與攪亂器/解攪亂器之介紹 4
2.1.1 同步欄介紹 5
2.1.2 訊框開始界定介紹 5
2.1.3 訊號欄介紹 6
2.1.4 服務欄介紹 6
2.1.5 長度欄介紹 7
2.1.6 循環餘數檢測介紹 10
2.1.7 攪亂器/解攪亂器架構介紹 10
2.2 調變方法之介紹 11
2.2.1 1 Mbps與2 Mbps之直接展頻調變 11
2.2.2 5.5 Mbps與11 Mbps之互補碼鍵(CCK) 11
2.2.3 5.5 Mbps與11 Mbps之封包二元迴旋碼調變(PBCC) 13
第三章 巴可碼與互補碼之探討 25
3.1 巴可碼之探討 25
3.2 互補碼之特性 26
3.3 互補碼鍵解調器之設計 29
3.3.1 相關器之介紹 29
3.3.2 快速華許轉換(Fast Walsh Transform)之介紹 30
3.3.3 電腦模擬與分析 32
第四章 IEEE 802.11b發射機與接收機之設計 44
4.1 收發機架構 44
4.1.1 發射機架構之介紹 44
4.1.2 接收機架構之介紹 45
4.2 通道模型之介紹 46
4.3 通道估測演算法之設計 47
4.3.1 前置訊號估測之方法 48
4.3.2 單週期虛擬雜訊序列相關性估測之方法 48
4.4 犁耙接收機 51
4.5 後標記多路徑消除(Post-Cursor Multipath Cancellation)之方法53
4.6 電腦模擬與分析 54
第五章 結論與討論 70
參考文獻 72

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