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DTUS065 rev A.7 – June 27, 2014
2.4GHz Overlapping radio channels
The radio channel is only an indication of the central frequency in use.
Modulation enlarges the channel to a 25 MHz band. This must be taken into
account when several Wi-Fi cells are near to each other in 2.4GHz (5GHz
channels do not overlap), otherwise the effective performance will decrease
due to interferences. This point is especially important when you try to cover
a geographic area with several access points.
Although the use of “non-overlapping” channels 1, 6, and 11 has limits
when products are too close, the 1–6–11 guideline has merit. If transmitter
channels are chosen closer than channels 1, 6, and 11 (for example, 1, 4, 7,
and 10), overlap between the channels may cause unacceptable degradation
of signal quality and throughput.
Example of geographical implantation of non-overlapping channels
5
10
4
9
3
8
13
12
2
7
1
6
11
2412
MHz
2437
MHz
2462
MHz
2399,5
MHz
2484,5
MHz
25 MHz
25 MHz
25 MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
5 MHz
Frequency
Channel
14
