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

A.1). Again, <strong>the</strong> results indicated that when two wireless nodes were too closely located,
it resulted in lower RSS and throughput.
Throughput ( Mbps )
20
15
10
5
0
Different AP Configurations: Throughput Comparison
Data File: 109 Data File: 274 Audio File: 263 Video File: 256
File Format and Size (MB)
- 62 -
AP Mode-1M AP Mode-2M
AP with E<strong>the</strong>rnet WDS with AP
WDS Mode
Figure 5.2: Throughput comparison with different AP configurations.
As mentioned in [71], APs can reach <strong>the</strong>ir maximum throughput with a certain file size.
Initially, throughputs will keep increasing along with an increased transferred file size
until it reaches <strong>the</strong> maximum capacity <strong>of</strong> <strong>the</strong> AP. However, our measurement results
indicate that <strong>the</strong>re is no apparent change <strong>of</strong> throughput with different file sizes. The
possible reason is that behavior <strong>of</strong> AP varies with different models and vendors.
We also found that <strong>the</strong> file format did not make a significant impact on throughput. For
example, a throughput <strong>of</strong> 10.306 Mbps (refer table A.2) was obtained on a 274 MB data
file, while a throughput <strong>of</strong> 10.236 Mbps was obtained on a 256 MB video file.
The throughput under <strong>the</strong> “WDS with AP mode” was lower (average throughput: 5.755
Mbps, refer table A.6) than <strong>the</strong> “AP mode” (10.357 Mbps) and <strong>the</strong> “AP mode” with