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

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inter-APs throughput than o<strong>the</strong>r locations. Phase 3 measurement showed that two APs could provide adequate RSS and throughput in <strong>the</strong> <strong>of</strong>fice. The configuration <strong>of</strong> “AP mode” with E<strong>the</strong>rnet connection would have much better inter-APs performance than <strong>the</strong> “WDS with AP mode”. However, <strong>the</strong> “WDS with AP mode” has <strong>the</strong> advantage <strong>of</strong> being cable free. Fur<strong>the</strong>rmore, two solutions for different requirements in WLAN design and deployment were discussed. The number <strong>of</strong> users that an AP can serve concurrently is an important issue <strong>of</strong> WLAN design and AP placement. <strong>An</strong> understanding <strong>of</strong> <strong>the</strong> characteristics <strong>of</strong> application and network throughput would help to calculate capacity. The throughputs and RSS were gained from extensive measurements. The average data size was based on <strong>the</strong> bandwidth <strong>of</strong> <strong>the</strong> Xtra wireless plan. Our capacity plan showed that two APs would provide sufficient throughput to serve every staff in <strong>the</strong> <strong>of</strong>fice. Previous studies on WLANs have focused more on improving <strong>the</strong> performance <strong>of</strong> PHY and MAC, transmission power control, and channel assignment than AP placement. According to our experience, observation and <strong>the</strong> propagation measurements conducted in this experimental study, we have concluded that an appropriate AP placement can improve WLAN performance significantly. Accordingly, we have proposed some recommendations for AP deployment through two WLAN deployment scenarios. In chapter 6, we discussed some implications <strong>of</strong> this study and possible directions for future research. RSS is an important factor for AP placement. Many AP placement projects are only based on RSS; however, over reliance on RSS may lead to wrong AP - 100 -
deployment. Many WLANs are deployed in indoor environments. In fact, <strong>the</strong> ‘WDS mode” supports point-to-point data communication. It is an appropriate solution to deploy WLAN in adjacent buildings. The future research may investigate WLAN performance issues in outdoor mesh networks. Comparison <strong>of</strong> measurement results by simulation is suggested as future research. Fur<strong>the</strong>rmore, wireless security is a momentous issue in WLANs. Various security mechanisms have been developed and implemented in APs and wireless nodes. <strong>An</strong> investigation on <strong>the</strong> impact <strong>of</strong> security mechanisms on WLAN performance is also suggested as future research. - 101 -
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An Investi
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2.3.5 Signal <stro
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Attestation of Aut
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Abstract Wireless local area networ
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List of Abbreviati
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List of Figures Fi
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List of Tables Tab
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Chapter 1 Introduction There has be
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WLAN performance evaluation and ana
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Chapter 2 Background and Related Wo
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The IEEE 802.11 networks have two o
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The coverage of a
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2.2.1 Physical Layer Figure 2.8 sho
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throughput significantly at higher
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DCF is designed to provide “best-
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Figure 2.11: Backof</strong
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modulation in [37]. According to si
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Figure 2.12: Net throughput <strong
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As highlighted in [46, 47], distanc
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2.3.2 Base Station Placement <stron
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gained an insight that this would m
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proposed to improve WLAN performanc
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specifications of
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dynamic and complicated. As argued
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In addition, we surveyed and review
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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-
Page 63 and 64: meeting room with different distanc
Page 65 and 66: Scenario 4 In figure 4.12, two APs
Page 67 and 68: “(H-3.5m)F-H” is the</s
Page 69 and 70: Figure 4.16: Phase 2 measurement: A
Page 71 and 72: performed the prop
Page 73 and 74: The receiver sensitivity is an impo
Page 75 and 76: In table 5.1, the
Page 77 and 78: Ethernet connectio
Page 79 and 80: sufficient signal coverage and thro
Page 81 and 82: throughput decreases along with low
Page 83 and 84: In table 5.1, when RSS is larger th
Page 85 and 86: (for example, measurement point “
Page 87 and 88: AP at Position “R” Figure 5.13
Page 89 and 90: The measurement results indicated t
Page 91 and 92: 5.2.2 Throughput An</strong
Page 93 and 94: impact on RSS and throughput. Resul
Page 95 and 96: The throughput of
Page 97 and 98: The RSS of “WDS
Page 99 and 100: The average throughput of</
Page 101 and 102: The average data size of</s
Page 103 and 104: 5.6.1 SOHO Environment Due to <stro
Page 105 and 106: The following notes are needed to b
Page 107 and 108: when APs were placed at positions
Page 109 and 110: Real and accurate results for AP pl
Page 111 and 112: Chapter 7 Summary and Conclusions W
Page 113: planning. Propagation measurement (
Page 117 and 118: placement in indoor wireless system
Page 119 and 120: Communications, vol. 2, no. 5, pp.
Page 121 and 122: [56] J. K. L. Wong, M. J. Neve, and
Page 123 and 124: eceived signal strength of<
Page 125 and 126: Appendix A Preliminary Experimental
Page 127 and 128: 2. AP Mode Measurement in t
Page 129 and 130: 7. The Ad-Hoc Mode Measurement on <
Page 131 and 132: Appendix B Phase 1 Experimental Res
Page 133 and 134: (P-1.5m)O-P 32.78 -86 193.6 0.453 N
Page 135 and 136: 3. Access Point at Position “E-3M
Page 137 and 138: (C-5m)C-D 21.63 -83 46.8 1.875 NLOS
Page 139 and 140: J 9.00 -44 8.2 10.703 LOS (J-1.5m)J
Page 141 and 142: 7. Access Point at Position “H”
Page 143 and 144: Figure B.2: Throughput map for AP a
Page 145 and 146: 60 40 20 0 -20 -40 -60 -80 -100 Acc
Page 147 and 148: (N-3m)N-O 15.00 -72 15.6 5.626 NLOS
Page 149 and 150: (C-3m)C-D 14.32 -74 13.6 6.453 NLOS
Page 151 and 152: Figure B.8: Throughput map for AP a
Page 153 and 154: 60 40 20 0 -20 -40 -60 -80 -100 Acc
Page 155 and 156: AP at A RX Position Left-Hand Area
Page 157 and 158: AP at L RX Position Left-Hand Area
Page 159 and 160: Appendix D Phase 3 Experimental Res
Page 161 and 162: TX at 2M from E-3M Data File: 153.6
Page 163 and 164: 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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