Download Lessons Learned Constructing the NG-Mesh Wireless

4.4. Results Analysis
McMaster - Elec. Eng. - M.A.Sc. - S.W.K. Ng
Figure 4.13: RSSI distribution due to 2.422 GHz file transmission (planar view).
A side-by-side comparison of the RSSI levels reported for a file transfer occurring
on Wi-Fi channel 6 by the software-based and retail spectrum analyzers is shown in
Figure 4.14. The software-based spectrum analyzer reports significantly higher RSSI
values than the retail version and a more distorted shape of the IEEE 802.11b spectral
mask for the same file transfer test. The first discrepancy could be attributed to
differences between their receiver sensitivities and the way in which the RSSI levels
are measured, computed, or reported. Thus the software-based implementation is
only suitable for accurately reporting the center frequencies of file transfer.
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