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研究生:黃學冠
研究生(外文):Xue-Guan Huang
論文名稱:IEEEStd802.11a-1999無線區域網路通訊協定之效能評估與改善
論文名稱(外文):Performance Evaluation and Improvement of the IEEE Std 802.11a-1999 Wireless LAN Protocol
指導教授:劉玉蓀
指導教授(外文):Yu-Sun Liu
學位類別:碩士
校院名稱:中原大學
系所名稱:電機工程研究所
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:2001
畢業學年度:89
語文別:中文
論文頁數:100
中文關鍵詞:IEEE Std 802.11a-1999正交分頻多工系統載波偵測多重存取/碰撞避免模糊邏輯控制
外文關鍵詞:IEEE Std 802.11a-1999OFDMCSMA/CAfuzzy logic control.IEEE Std 802.11a-1999正交分頻多工系統載波偵測多重存取/碰撞避免模糊邏輯控制。
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本論文對IEEE Std 802.11a-1999無線網路通訊協定的實體層與介面存取控制層做效能評估並提出改善方法。IEEE Std 802.11a-1999實體層利用正交分頻多工系統(Orthogonal Frequency Division Multiplexing, OFDM)來對抗多重路徑衰減的干擾,並以摺積碼搭配交錯器來更正由雜訊所造成的資料錯誤。本論文利用室內無線通道模型來模擬實體層的效能,經由模擬可得:以OFDM配合軟式摺積碼可以有效地降低封包錯誤率,封包錯誤率可以達到10-2~10-5之間。IEEE Std 802.11a-1999介面存取控制層是以載波偵測多重存取/碰撞避免(Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA)分散式協調功能為最基本的協定。當通訊台個數大於通道個數時,隨著通訊台的增加,CSMA/CA的效能會快速的下降。本論文提出兩個利用模糊邏輯控制來改善CSMA/CA效能的方法。經由模擬證實,本論文提出的兩個方法能有效的降低封包錯誤率,進而提升系統有效流量。本論文同時也將探討CSMA/CA及兩個控制方法對通訊台大幅改變及無線通道環境的敏感度。
The IEEE Std 802.11a-1999 wireless LAN protocol is considered. The physical layer of IEEE Std 802.11a-1999 in which Orthogonal Frequency Division Multiplexing (OFDM) and convolutional code are used to combat frequency-selective multipath fading is simulated. The simulation results verify that OFDM and soft-decision convolutional code can reduce frame error rate to 10-2~10-5. The MAC layer of IEEE Std 802.11a-1999 adopts Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) as a basic medium access control technique. In this paper, two fuzzy logic control CSMA/CA protocol are developed. The simulation results show that both fuzzy logic control protocol successfully improve the performance of CSMA/CA. Finally, the sensitivity of CSMA/CA and the proposed protocol to the variation of the number of stations and channel noise is discussed.
Keywords:IEEE Std 802.11a-1999, OFDM, CSMA/CA, fuzzy logic control.
摘要Ⅰ
AbstractⅡ
誌謝Ⅲ
目錄Ⅳ
圖表索引Ⅵ
第一章 緒論 1
第二章 室內無線通道傳輸環境
與IEEE Std 802.11a-1999實體層5
2.1室內無線通道傳輸環境5
2.2 IEEE Std 802.11a-1999實體層介紹8
2.3 模擬與分析 15
2.3.1 參數設定與系統假設15
2.3.2 室內無線通道模型15
2.3.3 模擬結果與分析17
第三章 IEEE Std 802.11a-1999介面存取控制層21
3.1 CSMA/CA分散式協調功能23
3.2 模擬與分析 29
3.2.1 參數設定與系統假設29
3.2.2 模擬結果與分析31
第四章 利用模糊邏輯控制方法改善CSMA/CA之效能35
4.1 簡介模糊邏輯演算法 36
4.2 模糊邏輯控制方法(一) 41
4.2.1 控制方法 41
4.2.2 模擬與分析 46
4.3 模糊邏輯控制方法(二) 55
4.3.1 控制方法 55
4.3.2 模擬與分析 56
第五章 系統敏感度 65
5.1 通訊台個數遽增與遽減 65
5.1.1 通訊台個數遽增65
5.1.2 通訊台個數遽減67
5.2 無線通道的影響—加入封包錯誤率73
第六章 結論 79
Reference 81
附錄 85
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