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

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Nowadays, WLAN adapter is standard equipment in <strong>the</strong> mobile computers and handheld devices. The price <strong>of</strong> entry level AP is under NZ $100. The number <strong>of</strong> internet hotspots is growing rapidly. WLANs provide convenient network services for people to access internet from home, <strong>of</strong>fice and public place. At <strong>the</strong> same time, many WLAN performance and deployment issues are emerging. Experimental measurement is becoming an important methodology for <strong>the</strong> performance study <strong>of</strong> WLANs. Experimental measurement provides an alternative to validate <strong>the</strong> results <strong>of</strong> analytical modeling and computer simulation as well as enhances <strong>the</strong> accuracy <strong>of</strong> WLAN research. The main challenge <strong>of</strong> indoor radio propagation measurement is to control external variables, such as signal reflection from moving objects and interference from devices operating on <strong>the</strong> same frequency [89]. Fur<strong>the</strong>rmore, it is difficult to make a realistic conclusion from a particular experiment [90]. <strong>An</strong> accurate WLAN performance study requires extensive propagation measurements. The propagation measurement has advantages in evaluating network performance before practical deployment or product launch. The experiment would demonstrate a representative behavior <strong>of</strong> WLAN equipment, characteristics <strong>of</strong> MAC protocols and radio propagation [71, 85]. In this dissertation, we adopted a propagation measurement approach as well as a case study approach to study <strong>the</strong> impact <strong>of</strong> signal strength on Wi-Fi link throughput in an obstructed <strong>of</strong>fice environment at AUT University. To collect data <strong>of</strong> signal strength and throughput, we conducted a series <strong>of</strong> experiments by using two wireless laptops and two APs. The detailed specification <strong>of</strong> measurement equipment, experimental setup and measurement scenarios are described in chapter 4. - 34 -
In addition, we surveyed and reviewed recent literature in <strong>the</strong> area <strong>of</strong> IEEE 802.11 WLANs, performance measurement, base station placement, and signal strength measurements. We focused on <strong>the</strong> following databases for our literature review: IEEE Xplore ACM Digital Library ScienceDirect Journal database Google Scholar (http://scholar.google.com/) - 35 -
Page 1 and 2: An Investi
Page 3 and 4: 2.3.5 Signal <stro
Page 5 and 6: Attestation of Aut
Page 7 and 8: Abstract Wireless local area networ
Page 9 and 10: 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: dynamic and complicated. As argued
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 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.
Page 121 and 122:
[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
Page 127 and 128:
2. AP Mode Measurement in t
Page 129 and 130:
7. The Ad-Hoc Mode Measurement on <
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Appendix B Phase 1 Experimental Res
Page 133 and 134:
(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
Page 147 and 148:
(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
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
Page 171 and 172:
Wireless 108G Add 802.11g Wireless
Page 173:
2.4GHz Omni-Directional 7dBi Indoor
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