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

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are presented in section 5.4.1 and 5.4.2 respectively. 5.4.1 WDS with AP Mode The results <strong>of</strong> RSS and throughput under “WDS with AP mode” are shown in figure 5.18 and 5.19. The numerical results are presented in appendix D (tables D.1 and D.2). 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 RSSI/Distance/Throughput, WDS with AP Mode N O P Q R S J K I Distance (Meter) RX Position RSSI (dBm) Throughput (Mbps) Figure 5.18: Results for WDS with AP mode TX at BSS1. RSSI/Distance/Throughput, WDS with AP Mode E D C B A G H F I RX Position Figure 5.19: Results for WDS with AP mode TX at BSS2. - 82 - Distance (Meter) RSSI (dBm) Throughput (Mbps)
The RSS <strong>of</strong> “WDS with AP mode” was close to phase 1 measurement results because <strong>the</strong> radio propagation environment did not change significantly. The average throughput (4.736 and 4.364 Mbps, refer tables D.1 and D.2) were lower than <strong>the</strong> preliminary measurement results (5.755 Mbps, refer table A.3) and phase 2 measurement results (5.61 Mbps, refer table 5.3). The reason <strong>of</strong> varying throughput results is that <strong>the</strong> RX position was changed during phase 3 measurements. Fur<strong>the</strong>rmore, when RX was located close to <strong>the</strong> AP, it had better throughput and RSS, for example, measurement points “N”: -42 dBm / 5.562 Mbps, and “E”: -45 dBm / 5.332 Mbps. The measurement results showed that RSS and location <strong>of</strong> AP placement have influenced throughput and performance. For example, when RX was located at position “I” and was associated with <strong>the</strong> AP (SSID: Wellington), <strong>the</strong> throughput was only 3.241 Mbps with -72 dBm RSS (refer table D.1). When RX was located at position “I” and was associated with <strong>the</strong> AP (SSID: Auckland), we gained a throughput <strong>of</strong> 4.237 Mbps with -67 dBm RSS (refer table D.2). Therefore, <strong>the</strong> results revealed that radio propagation environment and lower RSS would cause lower throughput and <strong>the</strong> position <strong>of</strong> AP had impact on both <strong>the</strong> throughput and RSS. When RX was located at position “I” and was associated with different APs, we obtained different RSSs (-72 and -67 dBm). When receiver sensitivity <strong>of</strong> WLAN adapter is -74 and -69 dBm, <strong>the</strong> data rates are 36 and 48 Mbps (refer table 5.1). Thus, <strong>the</strong> estimated throughputs are 7.2 and 9.6 Mbps (refer table 5.1). Since we configured <strong>the</strong> APs as “WDS with AP mode”, <strong>the</strong> throughputs were only half <strong>of</strong> normal “AP mode” throughput. The estimated throughputs <strong>of</strong> position “I” should be 3.6 and 4.8 Mbps. The measurement results (3.241 and 4.237 Mbps) were close to <strong>the</strong> estimated throughput. - 83 -
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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
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
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: The throughput of
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 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
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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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