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

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A.1). Again, <strong>the</strong> results indicated that when two wireless nodes were too closely located, it resulted in lower RSS and throughput. Throughput ( Mbps ) 20 15 10 5 0 Different AP Configurations: Throughput Comparison Data File: 109 Data File: 274 Audio File: 263 Video File: 256 File Format and Size (MB) - 62 - AP Mode-1M AP Mode-2M AP with E<strong>the</strong>rnet WDS with AP WDS Mode Figure 5.2: Throughput comparison with different AP configurations. As mentioned in [71], APs can reach <strong>the</strong>ir maximum throughput with a certain file size. Initially, throughputs will keep increasing along with an increased transferred file size until it reaches <strong>the</strong> maximum capacity <strong>of</strong> <strong>the</strong> AP. However, our measurement results indicate that <strong>the</strong>re is no apparent change <strong>of</strong> throughput with different file sizes. The possible reason is that behavior <strong>of</strong> AP varies with different models and vendors. We also found that <strong>the</strong> file format did not make a significant impact on throughput. For example, a throughput <strong>of</strong> 10.306 Mbps (refer table A.2) was obtained on a 274 MB data file, while a throughput <strong>of</strong> 10.236 Mbps was obtained on a 256 MB video file. The throughput under <strong>the</strong> “WDS with AP mode” was lower (average throughput: 5.755 Mbps, refer table A.6) than <strong>the</strong> “AP mode” (10.357 Mbps) and <strong>the</strong> “AP mode” with
E<strong>the</strong>rnet connection (11.863 Mbps). If a Cat-5 E<strong>the</strong>rnet cable is used instead <strong>of</strong> WDS, throughput can be improved around 103% (from 5.755 to 11.863 Mbps). The average throughput <strong>of</strong> “WDS mode” (19.281 Mbps, refer table A.5) was much better than o<strong>the</strong>r AP configurations. However, “WDS mode” only supports <strong>the</strong> point-to-point connection. Wireless clients cannot associate with <strong>the</strong> AP in WDS mode. 5.1.3 Scenario 6: The Ad-Hoc Mode in <strong>the</strong> Office Figure 5.3 shows <strong>the</strong> relationship <strong>of</strong> throughput, RSS, and distance coverage under an ad-hoc mode measurement with LOS condition. The average throughput was 5.507 Mbps and RSS was around -43 to -67 dBm (refer table A.7). 40 20 0 -20 -40 -60 -80 Ad-Hoc Mode Line-<strong>of</strong>-Sight: Distance/RSSI/Throughput 1 2 3 4 5 6 [G] 7 8 9 10 15 20 25 30 32 [R] Distance (Meter) - 63 - Distance (Meter) RSSI (dBm) Throughput (Mbps) Figure 5.3: The ad-hoc mode measurement with LOS in <strong>the</strong> <strong>of</strong>fice <strong>of</strong> WY building.
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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
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 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: In table 5.1, the
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
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
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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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