so the BLE advertising channels are located at 2402Mhz, 2426Mhz and 2480Mhz.
That is so it does not interfere with the 3 wifi channels in the 2.4Ghz band.
My question is especially about the 2426Mhz advertising channel. Wifi channel 6 ranges from 2426Mhz to 2448Mhz.
My understanding is that the 2426Mhz advertising channel of BLE ranges from 2425Mhz to 2427Mhz. Is this correct?
Then it does overlap with a wifi channel and interfere? Where is my falacy in the logic? I dont get it and cant find any information about this.
Execuse my probably bad english, its not my native language.
Regards
Best Answer
Wifi Channel 6 is centered at 2437Mhz and is 22Mhz large, so ranging from 2426 to 2448 as you stated (well that would rather be 23Mhz large, so not sure if it is 2427-2448 or 2426-2447).
But data is actually transmitted along a 20 MHz bandwidth, the remaining 2Mhz are used as a guard band so there's enough attenuation along the edge channel.
So there's no data transmitted at 2426 Mhz when using Wifi Channels 1 or 6 (1, 6 and 11 are the most used since they are non-overlapping)
From Argenox
You may find this study relevant to your question:
Coexistence and Interference Tests on a Bluetooth Low Energy Front-End
Here are some parts:
The study conclude that: