| 研究生: |
江文林 Wen-Lin Jiang |
|---|---|
| 論文名稱: |
無線網路技術應用於802.11b與802.11g效能評估與分析 An Evaluation of the performance of IEEE 802.11b and 802.11g |
| 指導教授: |
許健平
Jang-Ping Sheu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
資訊電機學院 - 資訊工程學系在職專班 Executive Master of Computer Science & Information Engineering |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 65 |
| 外文關鍵詞: | RTS/CTS, Infrastructure mode, Ad-hoc mode, WPA(Wi-Fi Protected Access) |
| 相關次數: | 點閱:8 下載:0 |
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近年來隨著無線通訊的迅速發展,使得無線區域網路應用層面越來越廣,原先主要的應用範圍是在家中或企業內部,由於802.11b或802.11g頻寬遠高於無線通訊GPRS 的100Kbps 或3G的 1Mbps 以及建置費用較GPRS與3G低,因此逐漸有將無線區域網路應用在公共場合,例如:咖啡廳、飯店或機場等等,而在市面上的WLAN產品大都標榜自家的傳輸效能可以到達高標準的流通率(Throughput),但使用者往往經過實際應用後,才會發現真正的效能其實遠低於產品所給予的期望數值,而這其中的因素對於提昇WLAN的產品非常重要。因此,在本篇論文中,我們將目前市場上一些具代表性晶片廠商的WLAN 卡在Ad-hoc mode的架構下,利用實際的傳輸距離和各種傳輸速率所表現出來的實際流通率作統計,並且有進一步效能的分析,在另一種Infrastructure mode上的架構,對無線基地台(Access Point)與不同的WLAN卡分別在電波隔離室和實際的住戶環境下對802.11b、802.11g、混合模式、啟用RTS/CTS存取機制及AP+Bridge mode下的環境作測試並找出目前市場上所使用晶片廠家中最為穩定及突出表現的組合。在無線網路安全性所使用的WEP加密、802.1x及WPA認證機制等技術對WLAN效能所產生的影響也都有相當的介紹及探討,在802.11b/g混合模式下的效能衰減,針對各晶片廠家的組合測出的效能和各種解決方案來作探討和比較。在實際環境方面上,我們提供兩種不同格局的測試住家環境來做模擬比較,並且針對在許多建築物的死角或間隔物較多的測試點所表現出的效能作進一步的討論。
An Evaluation of the performance of IEEE 802.11b and 802.11g
[1] IEEE Std 802.11b-1999, Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band.
[2] IEEE Std 802.11a-1999, Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-Speed Physical Layer in the 5 GHz Band.
[3] IEEE Std 802.11g-2004, Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications. Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band.
[4] IEEE Std 802.1X-2001, Local and metropolitan area networks-Port-Based Network Access Control.
[5] M. Heusse, F. Rousseau, B.- S. Gilles, and A. Duda, “Performance Anomaly of 802.11b,”in the proceedings of Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies Infocom 2003, Page836 – 843, March 2003.
[6] A. Doufexi, S. Armour, B.- S. Lee, A. Nix, and D. Bull, “An Evaluation of the Performance of IEEE 802.11a and 802.11g Wireless Local Area Networks in a Corporate Office Environment,”in the proceedings of IEEE International Conference on Communications (ICC ''03), Page1196 – 1200, May 2003.
[7] M.-J. Ho, J. Wang, K. Shelby, and H. Haisch, “IEEE 802.11g OFDM WLAN Throughput Performance,”in the proceedings of IEEE 58th Vehicular Technology Conference (VTC 2003), Page2252 – 2256, Oct. 2003.
[8] S. Armour, A. Doufexi, A. Nix, and D. Bull, “A Study of the Impact of Frequency Selectivity on Link Adaptive Wireless LAN System,” in the proceedings of IEEE 56th Vehicular Technology Conference (VTC 2002), Page738 – 742, Sept. 2002.
[9] C.Rigney, W. Willats, and P.Calhoun, "RADIUS Extensions", RFC 2869, June 2000.
[10] C.Rigney, S.Willens, A.Rubens, and W. Simpson, "Remote Authentication Dial In User Service (RADIUS)," RFC 2865, June 2000.
[11] J. Weatherall and A.Jones, “Ubiquitous Networks and Their Applications,”in the Journal of IEEE Wireless Communications, Page 18-29, Feb 2002.
[12] Joshua Hill, "An analysis of the RADIUS authentication Protocol," http://www.untruth.org/~josh/security/radius/radius-auth.html, InfoGard Laboratories, 2001.
[13] Gen-Li Chen, “The Analysis of Data Security in Wired Equivalent Privacy Algorithm for Wireless Local Area Network,”in the IEEE Communications Magazine, Page27-30, 2002.
[14] 鄭同伯,”802.11無線網路技術完全剖析”博碩文化,2004
[15] 黃裕彰,”802.11無線網路技術通論”O’REILLY,2003
[16] 唐政,”802.11無線區域網路通訊協定及應用”文魁,2003
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