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

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Figure 2.6: ESS and wired distribution system. 2.2 The IEEE 802.11 Protocols Figure 2.7 shows protocol architecture <strong>of</strong> <strong>the</strong> IEEE 802 family. As E<strong>the</strong>rnet and Token-Ring, <strong>the</strong> IEEE 802.11 standard defines both <strong>the</strong> physical and MAC layers. Although <strong>the</strong> IEEE 802.11a, 802.11b and 802.11g adopt different physical layer technologies, <strong>the</strong>y share a common MAC, LLC and use same link layer address space (48-bit). Figure 2.7: The IEEE 802 family and OSI model [14]. - 10 -
2.2.1 Physical Layer Figure 2.8 shows <strong>the</strong> physical layer architecture <strong>of</strong> <strong>the</strong> IEEE 802.11 standard. The IEEE 802.11 PHY is comprised <strong>of</strong> two sub-layers: (1) physical layer convergence procedure (PLCP); and (2) physical medium dependent (PMD) [14]. The PLCP is responsible for converting MAC frames into transmitting frames. The PMD function defines <strong>the</strong> transmitting method over wireless medium between wireless nodes. Figure 2.8: Physical layer logical architecture. In order to support various data rates, <strong>the</strong> IEEE 802.11 standards define several spread spectrum and modulation techniques. Spread spectrum is a crucial technology that is used for data transmission at <strong>the</strong> ISM band. Traditional telecommunication technology concentrates upon putting much signal into a narrow band. However, spread spectrum uses ma<strong>the</strong>matical methods to distribute signal power over a large band. Due to less potential interference, spread spectrum technique is an important requirement for radio devices to operate at <strong>the</strong> ISM band. In <strong>the</strong> USA, <strong>the</strong> Federal Communication Commission (FCC) requires that radio equipment which operates at <strong>the</strong> ISM band has to use spread spectrum technology [18]. Never<strong>the</strong>less, spread spectrum technology cannot resolve interference problem completely. Due to minimizing interference at <strong>the</strong> ISM band, <strong>the</strong> FCC has <strong>the</strong> power regulations to control transmitting power <strong>of</strong> wireless devices at <strong>the</strong> ISM band. The legal - 11 -
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: The coverage of a
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 and 76:
In table 5.1, the
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Ethernet connectio
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sufficient signal coverage and thro
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throughput decreases along with low
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In table 5.1, when RSS is larger th
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(for example, measurement point “
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AP at Position “R” Figure 5.13
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The measurement results indicated t
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5.2.2 Throughput An</strong
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impact on RSS and throughput. Resul
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The throughput of
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The RSS of “WDS
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The average throughput of</
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The average data size of</s
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5.6.1 SOHO Environment Due to <stro
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The following notes are needed to b
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when APs were placed at positions
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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.
Page 121 and 122:
[56] J. K. L. Wong, M. J. Neve, and
Page 123 and 124:
eceived signal strength of<
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Appendix A Preliminary Experimental
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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
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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
Page 167 and 168:
1 Maximum wireless signal rate deri
Page 169 and 170:
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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