Empirical Study on IEEE 802.11 Wireless Signal – A Case Study at the NCU Campus

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姓名

茱莉(Juli Dutta) 查詢紙本館藏

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資訊管理學系

論文名稱

Empirical Study on IEEE 802.11 Wireless Signal – A Case Study at the NCU Campus
(Empirical Study on IEEE 802.11 Wireless Signal – A Case Study at the NCU Campus)

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摘要(中)

在這裡，我們報告的信號強度上的文件傳輸和下載和上傳速度的影響進行實驗研究。我們使用一對筆記本電腦，一台iPad，在計算機中心和管理樓宇國立中央大學移動和TP-LINK無線接入點和結果它們之間做了一個對比進行了多次實驗。可以看出大信號覆蓋範圍和更高的下載和上傳速度在計算機中心的建設比管理建設。顯然，下載和上傳速度在所有的實驗地點迅速衰減距離接入點15米。視線堵塞的牆壁上發現有在的Wi-Fi鏈路吞吐量的顯著作用。

摘要(英)

Here we report an experimental investigation of the impact of signal strength on the file transfer and download and upload speeds. We have conducted several experiments using a pair of laptops, an ipad, a mobile and tp-link access point at the computer center and management buildings at National Central University and a comparison of results is made between them. It is seen large signal coverage area and higher downloads and uploads speed at computer center building than management building. Apparently, the download and upload speeds at all the experimental locations decay rapidly within 15 meters from the access point. Line-of-sight blockage by the walls is found to have the significant effect on the Wi-Fi link throughput.

關鍵字(中)

★ 無線網絡連接
★ 無線網絡的性能
★ IEEE 802.11
★ 的無線傳播環境

關鍵字(英)

★ Wi-Fi
★ Wireless networks performance
★ IEEE 802.11
★ radio propagation environments

論文目次

Abstract in English ……………………………………………….i
Abstract in Chinese …………………………………ii
Acknowledgements………………………………………… iii
Table of Contents…………………………………………………………………iv
List of abbreviations and notations…………………vi
List of Tables……………………………………………viii
List of Figures………………………………………………ix
Chapter 1 Introduction…………………………………1
1.1 Motivation ……………………………………………………………1
1.2 Objectives of This Research …………………………………3
1.3 Thesis Overview………………………………………………3
Chapter 2 Wireless Background and Related Research Works …4
2.1 Wireless Fidelity (Wi-Fi) ………………………………………..4
2.2 Overview of IEEE 802.11 ……………………………………………5
2.3 IEEE 802.11 Protocol ........................10
2.3.1 IEEE 802.11 Physical Layer (PHY) ………………………11
2.3.2 IEEE 802.11 Medium Access Control Layer (MAC) …11
2.4 RF Fundamentals for WLANs …………………………………….12
2.4.1 Propagation Characteristics Must Be Considered…12
2. 5 WLAN Signal Strength Measurement…………………13
2.5.1 WLAN Performance ………………………13
2.5.2 Base Station Placement …………………………15
2.5.3 Impact of Signal Quality on WLAN Performance …… 17
2.5.4 Conditions for better WLAN Performance Measurement ……………………19
Chapter 3 Research Methodology and Experimental Details ………21
3.1 Research Methodology………………………………21
3.2 Experimental details ………………………………………………………………….23
3.2.1 Hardware components ………………………………………………………...23
3.2.2 Software ……………………………………………………………………….25
3.2.3 Measurement scenarios ……………………………………………………….27
Chapter 4 Results and Discussions ……………………………………….30
4.1 WLAN performance measurement using TP-link AP……………………………….30
4.1.1 At the computer center of NCU………………………………………………..30
4.1.2 Line-of-sight blockage experiment at the computer center of NCU……………33
4.1.3 At the 9th floor of management building 2 of NCU…………………………….35
4.2 WLAN performance measurement …………………………………………………..40
4.2.1 MGT-I1-1F-103 at the 1st floor of management building 2 ……………………40
4.2.2 MGT-I1-9F-903 at the 9th floor of management building 2 ……………………42
4. 2.3 at different locations inside the campus………………………………………..44
Chapter 5 Conclusions and Future work ………………………………47
5.1 Conclusions …………………………………………………………………………..47
5.2 Future work …………………………………………………………………………..48
References ………………………………………………………………….50

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指導教授

李俊賢

審核日期

2014-6-30

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