An Investigation of the Impact of Signal Strength on Wi-Fi Link ...
An Investigation of the Impact of Signal Strength on Wi-Fi Link ...
An Investigation of the Impact of Signal Strength on Wi-Fi Link ...
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AP at Positi<strong>on</strong> “A”<br />
<strong>Fi</strong>gure 5.5 shows propagati<strong>on</strong> measurement results <str<strong>on</strong>g>of</str<strong>on</strong>g> distance, RSS and throughput<br />
when <str<strong>on</strong>g>the</str<strong>on</strong>g> AP was located at positi<strong>on</strong> “A”. RSS and throughput were sufficient between<br />
measurement points “B” and “I”. However, RSS and throughput were decreasing from<br />
measurement point “L”, because <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> number <str<strong>on</strong>g>of</str<strong>on</strong>g> obstructi<strong>on</strong>s and distance were<br />
increasing between <str<strong>on</strong>g>the</str<strong>on</strong>g> AP and RX. RSS <str<strong>on</strong>g>of</str<strong>on</strong>g> measurement points “O” was <str<strong>on</strong>g>the</str<strong>on</strong>g> lowest<br />
(-90 dBm, refer table B.1). Although measurement points “O” were not <str<strong>on</strong>g>the</str<strong>on</strong>g> fur<str<strong>on</strong>g>the</str<strong>on</strong>g>st<br />
point from <str<strong>on</strong>g>the</str<strong>on</strong>g> AP, some obstructi<strong>on</strong>s were located between <str<strong>on</strong>g>the</str<strong>on</strong>g> AP and RX, resulting in<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> lowest RSS and throughput (0.393 Mbps, refer table B.1) at measurement point “O”.<br />
40<br />
20<br />
0<br />
-20<br />
-40<br />
-60<br />
-80<br />
-100<br />
Access Point at positi<strong>on</strong> "A" : Distance/RSSI/Throughput<br />
B C D E F H G I L M J K N O P Q R S<br />
RX Positi<strong>on</strong><br />
<strong>Fi</strong>gure 5.5: Distance/RSSI/Throughput for AP at positi<strong>on</strong> “A”.<br />
- 66 -<br />
Throughput (Mbps)<br />
<str<strong>on</strong>g>Signal</str<strong>on</strong>g> strength (dBm)<br />
Distance (Meter)<br />
We found that RSS had significant impact <strong>on</strong> <strong>Wi</strong>-<strong>Fi</strong> link throughput. For example, RSS<br />
at measurement point “H” was -59 dBm with throughput 10.088 Mbps (refer table B.1).<br />
When RSS was -76 dBm at “M”, <str<strong>on</strong>g>the</str<strong>on</strong>g> throughput was <strong>on</strong>ly 3.134 Mbps. In general,