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研究生:黃逸群 
研究生(外文):Yi-Chun Huang
論文名稱:無線區域網路802.11b及載波回復迴路之研究
論文名稱(外文):A Study of Wireless LAN 802.11b and Carrier Recovery Loop
指導教授:歐陽彥杰
指導教授(外文):Y. C. Ouyang
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
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
中文關鍵詞:無線區域網路802.11.b802.11頻率偏移載波回復迴路迴路濾波器
外文關鍵詞:wireless LAN802.11.b802.11frequency offsetcarrier recovery looploop filter
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近年來隨著科技的發展,人類對資訊的需求已邁入了無線通訊的時代。許多無線通訊系統陸續被提出,無線區域網路IEEE 802.11便是其中之一。在本論文中我們將介紹802.11b中的通道模型、展頻技術以及調變技術等。但仍然有許多因素嚴重干擾無線網路系統的通訊品質,包括通道雜訊、通道衰減、以及頻率偏移及相位偏移等等…。論文中也針對載波回復迴路做討論,載波回復迴路已被廣泛的應用在解決送器及接收器之間的頻率偏移及相位偏移的問題。
載波回復迴路將會收斂及補償頻率偏移,但是卻不能補償由雜訊所造成的殘餘相位誤差。因此,我們提出了一個新載波回復迴路架構及演算法。演算法利用所接收訊號中的資訊及簡單的判斷式而不須利用到迴路濾波器與數值控制振盪器(NCO)即能回復頻率偏移和殘餘相位誤差。換句話說,訊號回復後會完全的落在I軸或Q軸上。比起傳統的載波回復迴路,此架構具有低複雜度及較短的收斂時間優點。
In recent years, with technology progress, data transmission used wireless interface has become popular. The IEEE 802.11 standard for wireless LAN was proposed for this propose. In this thesis, we introduce channel model, modulation formats, spread spectrum techniques and modulation techniques for 802.11.b. The wireless network systems would be degraded by numerous factors including channel fading, channel noise, frequency offset, and phase offset… etc. We discuss the carrier recovery loop to resolve the problem of frequency offset and phase offset between transmitter and receiver in this thesis.
The frequency offset is converged and compensated by the carrier recovery loop, but the residual phase error can’t be recovered. A new structure and algorithm are proposed for carrier recovery. The algorithms use the information of received signal to compensate the frequency offset and residual phase error without using the loop filter and NCO (Numerically Controlled Oscillator). In other words, the recovered signal is on the I and Q correctly. Compare with traditional carrier recovery loop, the new structure have the advantage of easy to implement and a shorter convergent time.
第一章 無線區域網路概論.…………………………………….……….. 1
1.1 背景………………………………………………..………………1
1.2 WLAN與3G間之比較與補強關係…………………………….2
1.2.1 WLAN與3G之比較………………….………………...2
1.2.2 WLAN與3G相互補強………………..…..……………...3
1.3 章節簡介…………....………………………..……………………4
第二章 IEEE802.11b架構簡介…………..………….…………….…....5
2.1 IEEE802.11無線區域網路(Wireless LAN)…….………………5
2.2 通道特性……………………………………….………….………6
2.2.1 時變多路徑通道…….………..………….…………..……...6
2.2.2 通道模型……..………………………..………….………...8
2.3 封包格式………………………..………………………………..11
2.4 展頻技術簡介………………………..…………………….…….16
2.4.1 展頻系統簡介………….………………………….……….17
2.4.1.1 直接序列展頻(DSSS)………………….…………….17
2.4.1.2 跳頻展頻(FHSS).……………………….….……….19
2.4.2 「直接序列展頻」與「跳頻展頻」之比較………….….20
2.4.3 展頻技術規格…………………………………………...…22
2.5 802.11b調變技術…………………………….………………….23
2.5.1 差分二相位移鍵(DBPSK)..…...……………………….23
2.5.2 差分四相位移鍵(DQPSK)……………..……………….26
2.5.3 展頻技術…………………………….…….……………….29
2.5.3.1 直接序列(DS)展頻……………………….………….30
2.5.3.2 互補碼(CCK)展頻…………………….…………….34
2.6 基頻處理器架構………………………..…………………….….40
第三章 載波回復迴路…………………………..……….………………45
3.1 載波回復簡介……………….………….………………………..46
3.2 鎖相迴路 (Phase-Locked Loop)…………………..…………….46
3.2.1 鎖相迴路分析………………………………..…………….46
3.3 數位柯斯塔迴路…………………………………...…………….52
3.3.1 相位偵測器…………………………………….….……….52
3.3.2 迴路濾波器………………………………………….…….56
3.3.3 數值控制振盪器……….…………………………….…….59
第四章 新載波回復架構……………………………………………….61
4.1 新架構及演算法………………………………….…………..61
4.1.1 適用DBPSK調變之判別演算法步驟…………………..63
4.1.2 適用QPSK調變之判別演算法步驟…………....………..64
4.2 演算法實例說明…….……….….……………………………….66
4.3 結論…………………………………………………………76
第五章 模擬結果……………………...………….………………..…….77
5.1 傳統載波迴路模擬………………….….………………………..77
5.2 新載波回復架構模擬……………….….………………………..94
5.3 模擬總結………………….…….………..……………………..105
第六章 結論…………………………………………………………….106
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