An Investigation of the Impact of Signal Strength on Wi-Fi Link ...

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Table <strong>of</strong> Contents ATTESTATION OF AUTHORSHIP ................................................................... IV ACKNOWLEDGEMENTS ................................................................................. V ABSTRACT ...................................................................................................... VI LIST OF ABBREVIATIONS AND NOTATIONS.............................................. VIII LIST OF FIGURES ............................................................................................ X LIST OF TABLES ............................................................................................ XII CHAPTER 1 INTRODUCTION .......................................................................1 1.1 Objective <strong>of</strong> This Research Project .............................................................................. 3 1.2 Dissertation Structure.................................................................................................... 4 CHAPTER 2 BACKGROUND AND RELATED WORKS................................5 2.1 Overview <strong>of</strong> <strong>the</strong> IEEE 802.11 Standard ....................................................................... 5 2.2 The IEEE 802.11 Protocols.......................................................................................... 10 2.2.1 Physical Layer ............................................................................................................11 2.2.2 Medium Access Control ............................................................................................ 13 2.2.3 Radio Propagation Characteristics............................................................................. 17 2.3 WLAN <strong>Signal</strong> <strong>Strength</strong> Measurement ....................................................................... 20 2.3.1 WLAN Performance.................................................................................................. 20 2.3.2 Base Station Placement ............................................................................................. 25 2.3.3 <strong>Impact</strong> <strong>of</strong> <strong>Signal</strong> Quality on WLAN Performance .................................................... 27 2.3.4 Recommendations for WLAN Performance Measurement....................................... 29 - i -
2.3.5 <strong>Signal</strong> <strong>Strength</strong> and Indoor Positioning System ........................................................ 30 CHAPTER 3 RESEARCH METHODOLOGY ...............................................32 CHAPTER 4 EXPERIMENTAL DESIGN ......................................................36 4.1 Performance Metrics ................................................................................................... 37 4.2 Hardware and S<strong>of</strong>tware Requirements...................................................................... 37 4.2.1 Hardware Equipment................................................................................................. 37 4.2.2 S<strong>of</strong>tware..................................................................................................................... 39 4.3 Propagation Measurement Environment................................................................... 40 4.4 Access Point and Wireless Adapter ............................................................................ 42 4.4.1 AP Configuration....................................................................................................... 42 4.4.2 Wireless Adapter Configuration ................................................................................ 45 4.4.3 AP Operation Mode................................................................................................... 47 4.5 Propagation Measurement Scenarios......................................................................... 48 4.5.1 Preliminary Propagation Measurement ..................................................................... 48 4.5.2 Phase 1 Propagation Measurements .......................................................................... 52 4.5.3 Phase 2 Propagation Measurements .......................................................................... 54 4.5.4 Phase 3 Propagation Measurements .......................................................................... 55 4.6 Measurement Accuracy ............................................................................................... 56 4.7 Summary....................................................................................................................... 57 CHAPTER 5 RESULTS AND DISCUSSION.................................................58 5.1 Preliminary Measurement Results ............................................................................. 58 5.1.1 Scenario 1: The Ad-Hoc Mode in <strong>the</strong> Meeting Room............................................... 60 5.1.2 Scenario 2 to 5: The Infrastructure Mode in <strong>the</strong> Meeting Room............................... 61 5.1.3 Scenario 6: The Ad-Hoc Mode in <strong>the</strong> Office............................................................. 63 5.2 Phase 1 Measurement .................................................................................................. 65 5.2.1 Results and Discussion .............................................................................................. 65 5.2.2 Throughput <strong>An</strong>alysis ................................................................................................. 77 5.2.3 Comments.................................................................................................................. 78 - ii -
Page 1: An Investi
Page 5 and 6: Attestation of Aut
Page 7 and 8: Abstract Wireless local area networ
Page 9 and 10: List of Abbreviati
Page 11 and 12: List of Figures Fi
Page 13 and 14: List of Tables Tab
Page 15 and 16: Chapter 1 Introduction There has be
Page 17 and 18: WLAN performance evaluation and ana
Page 19 and 20: Chapter 2 Background and Related Wo
Page 21 and 22: The IEEE 802.11 networks have two o
Page 23 and 24: The coverage of a
Page 25 and 26: 2.2.1 Physical Layer Figure 2.8 sho
Page 27 and 28: throughput significantly at higher
Page 29 and 30: DCF is designed to provide “best-
Page 31 and 32: Figure 2.11: Backof</strong
Page 33 and 34: modulation in [37]. According to si
Page 35 and 36: Figure 2.12: Net throughput <strong
Page 37 and 38: As highlighted in [46, 47], distanc
Page 39 and 40: 2.3.2 Base Station Placement <stron
Page 41 and 42: gained an insight that this would m
Page 43 and 44: proposed to improve WLAN performanc
Page 45 and 46: specifications of
Page 47 and 48: dynamic and complicated. As argued
Page 49 and 50: In addition, we surveyed and review
Page 51 and 52: 4.1 Performance Metrics A stopwatch
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Model: DWL-G132 Specification: Sta
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Figure 4.1: WY building layout. - 4
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Figure 4.2 shows wireless configura
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4.4.2 Wireless Adapter Configuratio
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4.4.3 AP Operation Mode Two APs (D-
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meeting room with different distanc
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Scenario 4 In figure 4.12, two APs
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“(H-3.5m)F-H” is the</s
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Figure 4.16: Phase 2 measurement: A
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performed the prop
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The receiver sensitivity is an impo
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In table 5.1, the
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Ethernet connectio
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sufficient signal coverage and thro
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throughput decreases along with low
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In table 5.1, when RSS is larger th
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(for example, measurement point “
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AP at Position “R” Figure 5.13
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The measurement results indicated t
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5.2.2 Throughput An</strong
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impact on RSS and throughput. Resul
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The throughput of
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The RSS of “WDS
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The average throughput of</
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The average data size of</s
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5.6.1 SOHO Environment Due to <stro
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The following notes are needed to b
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when APs were placed at positions
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Real and accurate results for AP pl
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Chapter 7 Summary and Conclusions W
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planning. Propagation measurement (
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deployment. Many WLANs are deployed
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placement in indoor wireless system
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Communications, vol. 2, no. 5, pp.
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[56] J. K. L. Wong, M. J. Neve, and
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eceived signal strength of<
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Appendix A Preliminary Experimental
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2. AP Mode Measurement in t
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7. The Ad-Hoc Mode Measurement on <
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Appendix B Phase 1 Experimental Res
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(P-1.5m)O-P 32.78 -86 193.6 0.453 N
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3. Access Point at Position “E-3M
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(C-5m)C-D 21.63 -83 46.8 1.875 NLOS
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J 9.00 -44 8.2 10.703 LOS (J-1.5m)J
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7. Access Point at Position “H”
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Figure B.2: Throughput map for AP a
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60 40 20 0 -20 -40 -60 -80 -100 Acc
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(N-3m)N-O 15.00 -72 15.6 5.626 NLOS
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(C-3m)C-D 14.32 -74 13.6 6.453 NLOS
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Figure B.8: Throughput map for AP a
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60 40 20 0 -20 -40 -60 -80 -100 Acc
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AP at A RX Position Left-Hand Area
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AP at L RX Position Left-Hand Area
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Appendix D Phase 3 Experimental Res
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TX at 2M from E-3M Data File: 153.6
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IEEE 802.11 b/g Access Point DWL-21
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Standards • IEEE 802.11g • IEEE
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1 Maximum wireless signal rate deri
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Wireless 108G Standards • 802.11b
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Wireless 108G Add 802.11g Wireless
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2.4GHz Omni-Directional 7dBi Indoor
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An Investigation of the Impact of Signal Strength on Wi-Fi Link ...

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