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

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around 18 on <strong>the</strong> “right-hand side” and 17 on <strong>the</strong> “left-hand side” <strong>of</strong> <strong>the</strong> <strong>of</strong>fice. Although <strong>the</strong> estimated capacity was more than <strong>the</strong> number <strong>of</strong> current staff, <strong>the</strong> rest <strong>of</strong> <strong>the</strong> capacity can be used for visitors. AP Position Throughput Capacity AP Position Throughput Capacity Total Capacity BSS 1 (Mbps) (A) BSS 2 (Mbps) (B) (A+B) A 8.838 25 R 8.820 28 53 A 8.838 25 J 8.972 29 54 G 8.554 26 R 8.820 28 54 G 8.554 26 J 8.972 29 55 E-3M 8.949 28 N-3M 10.085 29 57 Table 5.6: WLAN capacity with two APs for web application In conclusion, <strong>the</strong> throughput, RSS, and capacity plan revealed that two APs not only provide sufficient RSS and throughput, but also sufficient capacity to support staff who worked in <strong>the</strong> <strong>of</strong>fice. 5.6 Recommendations for Access Point Deployment To find optimal location <strong>of</strong> AP placement, we conducted an extensive series <strong>of</strong> propagation measurements and an in-depth comparison <strong>of</strong> throughput with different AP placement scenarios and AP configurations. We also assessed <strong>the</strong> capability <strong>of</strong> APs. However, all <strong>of</strong> those only solved partial issues <strong>of</strong> AP deployment. Therefore, we would like to provide some recommendations for practical AP deployment which we derived from this study. The recommendations are presented based on two scenarios: a small <strong>of</strong>fice, a home <strong>of</strong>fice (SOHO) environment (section 5.6.1) and a medium-sized business environment (section 5.6.2). - 88 -
5.6.1 SOHO Environment Due to <strong>the</strong> availability <strong>of</strong> low cost APs, <strong>the</strong> deployment <strong>of</strong> WLAN is increasing at home and small <strong>of</strong>fice. Figure 5.22 shows AP deployment scenario in a SOHO environment. We assume that a single AP would be sufficient for SOHO environment. Figure 5.22: Small <strong>of</strong>fice and home <strong>of</strong>fice scenario. Although SOHO WLAN deployment is simple, WLAN design should take into account <strong>the</strong> following points. Site survey: <strong>the</strong> site survey could help WLAN designers to estimate radio signal coverage and <strong>the</strong> number <strong>of</strong> APs in rough, search <strong>the</strong> possible interference sources, and understand geography <strong>of</strong> real environment [94]. Interference: AP should be as far as possible away from o<strong>the</strong>r radio equipment (e.g. microwave oven, cordless phone) due to avoiding interference. RSS: users should not rely on RSS only. Our study results showed that distance, obstructions and LOS/LOS also affect <strong>the</strong> WLAN performance. Radio channel assignment: with popular deployment <strong>of</strong> AP, careful channel - 89 -
Page 1 and 2:
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
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
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: The average data size of</s
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 and 114: planning. Propagation measurement (
Page 115 and 116: deployment. Many WLANs are deployed
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
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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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