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

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Chapter 4 Experimental Design In chapter 3, <strong>the</strong> research methodology adopted in this dissertation has been discussed. This chapter provides experimental research design, which involves <strong>the</strong> details <strong>of</strong> <strong>the</strong> hardware and s<strong>of</strong>tware equipment, description on <strong>the</strong> propagation environment, and measurement scenarios. In section 4.1, we describe <strong>the</strong> performance metrics, such as throughput and signal strength. Section 4.2 presents <strong>the</strong> detailed specification <strong>of</strong> hardware and s<strong>of</strong>tware. Section 4.3 describes <strong>the</strong> propagation measurement environment and section 4.4 describes <strong>the</strong> AP and wireless adapter configuration. In section 4.5, we present experimental scenarios and section 4.6 describes some preliminary works <strong>of</strong> reducing unexpected interference prior to conducting propagation measurement. Finally, section 4.7 summarises this chapter. - 36 -
4.1 Performance Metrics A stopwatch is used to measure file transmission time. The link throughput <strong>of</strong> WLAN is computed by dividing <strong>the</strong> file size with <strong>the</strong> total transmission time as follows: Throughput (Mbps) = File Size (Mbits) / Transmission Time (Seconds) The received signal strength is measured in “dBm”, which is an absolute unit to measure <strong>the</strong> power level in decibel (dB) <strong>of</strong> <strong>the</strong> measured power relative to one milliwatt (mW). The WirelessMon s<strong>of</strong>tware is used to measure <strong>the</strong> received signal strength. Although <strong>the</strong> goal <strong>of</strong> measurement focuses on Wi-Fi link throughput, it is still important to consider o<strong>the</strong>r network layers, including <strong>the</strong> network, transport, and application layer protocols. Colligo Workgroup s<strong>of</strong>tware was used to provide user interface for our experiments. Micros<strong>of</strong>t Windows XP operating system provided TCP/IP protocol for network addressing and transportation control. 4.2 Hardware and S<strong>of</strong>tware Requirements This section presents <strong>the</strong> specifications <strong>of</strong> <strong>the</strong> hardware equipment and s<strong>of</strong>tware information which were used in this propagation measurement. 4.2.1 Hardware Equipment Two laptops, two APs, two wireless adapters and two external antennas were used in this propagation measurement. The following list briefly shows specifications <strong>of</strong> laptops and WLAN equipments used in this study. The detailed specifications <strong>of</strong> WLAN equipment can be found in appendix E. - 37 -
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 and 48: dynamic and complicated. As argued
Page 49: In addition, we surveyed and review
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
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Chapter 7 Summary and Conclusions W
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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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