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

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In figure 4.13, two APs were configured as “WDS mode”. Both TX and RX used Cat-5 cables to connect with APs. By conducting scenario 2 to 5 experiments, we gained an insight into <strong>the</strong> relationship between file size, file format, distance, signal strength and throughput with different AP mode configurations. The experimental results <strong>of</strong> scenario 2 to 5 are presented in chapter 5 (section 5.1.2). Scenario 6 The ad-hoc mode measurement was performed in <strong>the</strong> obstructed <strong>of</strong>fice environment. TX was located at position “A” (as shown in figure 4.1). The position <strong>of</strong> RX was moved around <strong>the</strong> entire <strong>of</strong>fice to investigate <strong>the</strong> signal coverage and throughput. A data file (10.9 MB) was sent from TX to RX on each <strong>of</strong> RX location. By conducting scenario 6, we gained an insight into RSS, signal coverage and throughput without AP involved in <strong>the</strong> obstructed <strong>of</strong>fice block. The experimental results <strong>of</strong> scenario 6 are presented in chapter 5 (section 5.1.3). 4.5.2 Phase 1 Propagation Measurements We configured an AP as “AP mode” for phase 1 propagation measurements. The more detailed description <strong>of</strong> phase 1 measurement is described next. Scenario 7 In figure 4.14, an AP was located at position “A” and TX was placed 2 meters away from <strong>the</strong> AP. Nineteen measurement points from A to S were defined in <strong>the</strong> <strong>of</strong>fice. O<strong>the</strong>r than <strong>the</strong> nineteen measurement points, extensive measurements were also conducted in <strong>the</strong> corners and some areas <strong>of</strong> weak signal strength. For example, position - 52 -
“(H-3.5m)F-H” is <strong>the</strong> measurement point which is 3.5 meters away from “H” and is between “F” and “H”. Figure 4.14: Phase 1 measurement: an AP at position “A”. Eleven measurement points were selected for AP placement (A, F, G, H, I, J, K, L, R, E-3M, N-3M). TX was located 2 meters from <strong>the</strong> AP. A trolley was used to carry RX and RX was moved around all measurement points. A data file (10.9 MB) was sent from TX to RX in each measurement point, and a stopwatch was used to measure transmission time. The WirelessMon s<strong>of</strong>tware was used to measure RSS at each RX location. By conducting extensive experiments, we gained an insight into RSS and throughput <strong>of</strong> an AP placement in an obstructed <strong>of</strong>fice environment. The experimental results are presented in chapter 5 (section 5.2). - 53 -
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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
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
Page 65: Scenario 4 In figure 4.12, two APs
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 (
Page 115 and 116: 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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