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

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Figure 5.3: The ad-hoc mode measurement with LOS in <strong>the</strong> <strong>of</strong>fice <strong>of</strong> WY building. ..................................................................................................63 Figure 5.4: The ad-hoc mode measurement with NLOS in <strong>the</strong> <strong>of</strong>fice <strong>of</strong> WY building. ..................................................................................................64 Figure 5.5: Distance/RSSI/Throughput for AP at position “A”......................66 Figure 5.6: Throughput map for AP at position “A”.......................................67 Figure 5.7: Distance/RSSI/Throughput for AP at position “G”......................68 Figure 5.8: Throughput map for AP at position “G”.......................................69 Figure 5.9: Distance/RSSI/Throughput for AP at position “E-3M”................70 Figure 5.10: Throughput map for AP at position “E-3M”. .............................71 Figure 5.11: Distance/RSSI/Throughput for AP at position “J”. ....................72 Figure 5.12: Throughput map for AP at position “J”. .....................................72 Figure 5.13: Distance/RSSI/Throughput for AP at position “R”. ...................73 Figure 5.14: Throughput map for AP at position “R”. ....................................74 Figure 5.15: Distance/RSSI/Throughput for AP at position “N-3M”. ............75 Figure 5.16: Throughput map for AP at position “N-3M”..............................76 Figure 5.17: Comparison with different AP configurations and placements. .80 Figure 5.18: Results for WDS with AP mode TX at BSS1.............................82 Figure 5.19: Results for WDS with AP mode TX at BSS2.............................82 Figure 5.20: Results for AP mode with E<strong>the</strong>rnet connection TX at BSS1......84 Figure 5.21: Results for AP mode with E<strong>the</strong>rnet connection TX at BSS2......84 Figure 5.22: Small <strong>of</strong>fice and home <strong>of</strong>fice scenario. ......................................89 Figure 5.23: Medium-sized business scenario. ...............................................90 Figure B.1: Throughput/RSSI/Distance for AP at position “H”. ..................128 Figure B.2: Throughput map for AP at position “H”. ...................................129 Figure B.3: Throughput/RSSI/Distance for AP at position “F”. ...................131 Figure B.4: Throughput map for AP at position “F”.....................................131 Figure B.5: Throughput/RSSI/Distance for AP at position “I”.....................133 Figure B.6: Throughput map for AP at position “I”......................................134 Figure B.7: Throughput/RSSI/Distance for AP at position “L”....................136 Figure B.8: Throughput map for AP at position “L”.....................................137 Figure B.9: Throughput/RSSI/Distance for AP at position “K”. ..................139 Figure B.10: Throughput map for AP at position “K”. .................................139 - xi -
List <strong>of</strong> Tables Table 2.1: Data rate and modulation techniques for <strong>the</strong> IEEE 802.11a. .........12 Table 2.2: <strong>Signal</strong> attenuation with different constructional material [18].......20 Table 5.1: Receiver sensitivity, <strong>the</strong>oretical data rate and estimated throughput. .................................................................................................................59 Table 5.2: Average throughput <strong>of</strong> AP with different positions........................77 Table 5.3: Comparison with different AP configurations and placements......79 Table 5.4: Completion times and data sizes for applications [96]. .................86 Table 5.5: WLAN capacity with a signal AP for web application. .................87 Table 5.6: WLAN capacity with two APs for web application.......................88 Table A.1: Numerical results for ad-hoc mode. ............................................112 Table A.2: Numerical results for AP mode. ..................................................113 Table A.3: Numerical results for WDS with AP mode.................................. 113 Table A.4: Numerical results for AP Mode with E<strong>the</strong>rnet connection..........113 Table A.5: Numerical results for WDS Mode...............................................114 Table A.6: Throughput comparison with different AP configuration............114 Table A.7: Numerical results for an ad-hoc mode with LOS........................115 Table A.8: Numerical results for an ad-hoc mode with NLOS.....................116 Table B.1: Numerical results for AP at position “A”. ...................................119 Table B.2: Numerical results for AP at position “G”. ...................................120 Table B.3: Numerical results for AP at position “E-3M”..............................122 Table B.4: Numerical results for AP at position “J”. ....................................123 Table B.5: Numerical results for AP at position “R”. ...................................125 Table B.6: Numerical results for AP at position “N-3M”. ............................126 Table B.7: Numerical results for AP at position “H”. ...................................128 Table B.8: Numerical results for AP at position “F”.....................................130 Table B.9: Numerical results for AP at position “I”......................................133 Table B.10: Numerical results for AP at position “L”...................................136 Table B.11: Numerical results for AP at position “K”. .................................138 Table C.1: Throughput analysis for AP at position “A”................................141 Table C.2: Throughput analysis for AP at position “G”................................141 Table C.3: Throughput analysis for AP at position “H”................................141 Table C.4: Throughput analysis for AP at position “F”. ...............................142 - xii -
Page 1 and 2: An Investi
Page 3 and 4: 2.3.5 Signal <stro
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: List of Figures Fi
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
Page 53 and 54: Model: DWL-G132 Specification: Sta
Page 55 and 56: Figure 4.1: WY building layout. - 4
Page 57 and 58: Figure 4.2 shows wireless configura
Page 59 and 60: 4.4.2 Wireless Adapter Configuratio
Page 61 and 62: 4.4.3 AP Operation Mode Two APs (D-
Page 63 and 64:
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
Page 69 and 70:
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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