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

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wireless clients and forwards to o<strong>the</strong>r wireless clients or wired clients (via E<strong>the</strong>rnet). WDS Mode In WDS mode, AP only provides a wireless bridge function. Wireless clients cannot associate with AP in WDS mode. WDS mode is a feasible solution when people would like to have wireless network connection between two or more buildings without a cable running through. WDS with AP Mode In <strong>the</strong> WDS with AP mode, AP plays <strong>the</strong> role <strong>of</strong> a coordinator and wireless bridge. The AP <strong>of</strong>fers AP mode and WDS mode functions. 4.5 Propagation Measurement Scenarios The propagation measurement is divided into four phases: (1) preliminary measurement; (2) phase 1; (3) phase 2; and (4) phase 3. The detailed description <strong>of</strong> each phase and measurement scenarios are presented next. 4.5.1 Preliminary Propagation Measurement The aim <strong>of</strong> preliminary measurement was to collect sample data to compare with <strong>the</strong> results <strong>of</strong> phase 1 to 3. Scenarios 1 to 5 were conducted in <strong>the</strong> meeting room under a controlled environment. In addition, scenario 6 was conducted to investigate <strong>the</strong> signal coverage and throughput without an AP in <strong>the</strong> obstructed <strong>of</strong>fice block. Scenario 1 The height <strong>of</strong> <strong>the</strong> transmitter (TX) and <strong>the</strong> receiver (RX) was placed 1 meter from <strong>the</strong> ground to avoid <strong>the</strong> Fresnel zone in all <strong>of</strong> <strong>the</strong> below mentioned propagation measurements. In addition, <strong>the</strong> propagation measurements were performed in <strong>the</strong> - 48 -
meeting room with different distances, different file sizes, and file formats in scenarios 1 to 5. A stopwatch was used to measure transmission time and WirelessMon s<strong>of</strong>tware was used to measure RSS at RX in all <strong>of</strong> below measurement scenarios. In figure 4.9, two laptops were configured as ad-hoc mode. The distance between laptops was set to 1, 2, and 3 meters. The experimental results <strong>of</strong> scenario 1 are presented in chapter 5 (section 5.1.1). Scenario 2 Figure 4.9: The ad-hoc mode measurement (scenario 1). The height <strong>of</strong> APs was placed 1 meter from <strong>the</strong> ground in all <strong>of</strong> <strong>the</strong> below mentioned measurement scenarios. <strong>An</strong> AP was configured as “AP mode” and <strong>the</strong> throughputs were measured with different distances (1 and 2 meters) between <strong>the</strong> AP and laptops (as shown in figure 4.10). - 49 -
Page 1 and 2:
An Investi
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2.3.5 Signal <stro
Page 5 and 6:
Attestation of Aut
Page 7 and 8:
Abstract Wireless local area networ
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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
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: 4.4.3 AP Operation Mode Two APs (D-
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 and 114:
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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