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

More documents

Recommendations

Info

a basic architecture <strong>of</strong> <strong>the</strong> IEEE 802.11 network. It may include two or more wireless nodes. The nodes can be a wireless workstation or an AP. All wireless nodes share a signal coordination function in <strong>the</strong> same BSS. Figure 2.3 shows three BSSs and each BSS has an AP and two wireless stations. IBSS is <strong>the</strong> smallest service unit in <strong>the</strong> IEEE 802.11 network (as shown in figure 2.4). The advantage <strong>of</strong> <strong>the</strong> IBSS is that it can enable two wireless stations to form a WLAN without an AP. Figure 2.3: Basic service set. Figure 2.4: Independent basic service set. - 8 -
The coverage <strong>of</strong> a BSS is limited due to limited transmission power. Some organizations may require two or more BSSs to cover entire organization. In order to provide service between different BSSs, it requires a distribution system (DS) which is a logical unit between different BSSs [13]. The main function <strong>of</strong> a DS is to provide interconnection and seamless services among <strong>the</strong> multiple BSSs. The DS can be wired connection or wireless connection. With wireless DS, <strong>the</strong> role <strong>of</strong> an AP is not only a coordinator between wireless stations within BSS, but also provide links to o<strong>the</strong>r BSSs. Figure 2.5 shows an ESS which is comprised <strong>of</strong> three BSSs and a wireless DS (WDS). Figure 2.5: ESS and wireless distribution system. Figure 2.6 shows an ESS architecture with a wired DS. The DS and BSSs provide flexibility to create various sizes <strong>of</strong> WLANs. The ESS is comprised <strong>of</strong> multiple DSs and BSSs [17]. All wireless stations and APs share <strong>the</strong> same logical link control (LLC) layer within <strong>the</strong> same ESS. - 9 -
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: The IEEE 802.11 networks have two o
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 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
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
Page 127 and 128:
2. AP Mode Measurement in t
Page 129 and 130:
7. The Ad-Hoc Mode Measurement on <
Page 131 and 132:
Appendix B Phase 1 Experimental Res
Page 133 and 134:
(P-1.5m)O-P 32.78 -86 193.6 0.453 N
Page 135 and 136:
3. Access Point at Position “E-3M
Page 137 and 138:
(C-5m)C-D 21.63 -83 46.8 1.875 NLOS
Page 139 and 140:
J 9.00 -44 8.2 10.703 LOS (J-1.5m)J
Page 141 and 142:
7. Access Point at Position “H”
Page 143 and 144:
Figure B.2: Throughput map for AP a
Page 145 and 146:
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
Page 149 and 150:
(C-3m)C-D 14.32 -74 13.6 6.453 NLOS
Page 151 and 152:
Figure B.8: Throughput map for AP a
Page 153 and 154:
60 40 20 0 -20 -40 -60 -80 -100 Acc
Page 155 and 156:
AP at A RX Position Left-Hand Area
Page 157 and 158:
AP at L RX Position Left-Hand Area
Page 159 and 160:
Appendix D Phase 3 Experimental Res
Page 161 and 162:
TX at 2M from E-3M Data File: 153.6
Page 163 and 164:
IEEE 802.11 b/g Access Point DWL-21
Page 165 and 166:
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
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?