What I want to do:
I want to do some experiments with devices such as a Raspberry Pi in environments, where there is noise in the 2.4GHz and 5GHz band.
What I tried so far:
My idea was to simply use the wireless tools in Linux, such as
wpa_cli, which can in theory display dBm values for both the signal strength (which works without problems) and the noise floor (which I am not able to get).
However, as far as I understand whether a reasonable noise value is actually calculated is dependent on the support by the driver of the WiFi chipset. To my bad luck, it seems that I am not in possession of any such chipset and I find a hard time to see, which chipset drivers actually do support a noise measurement (Chipsets tested BCM43438, AR9271, RTL8723BE, RTL8188CU). See also e.g. this question.
The reason this noise value would be very attractive to me, is that it is already the product of a specific algorithm that takes the radio spectrum in the WiFi channel of choice and processes this input to give a single value for noise. (If anybody knows anything about those algorithms used, please let me know, I would also be interested in that).
Can anybody help me:
In order to perform meaningful WiFi noise measurements in the 2.4 GHz (and possibly also the 5 GHz WiFi-band), I was wondering, if I need special drivers for my WiFi hardware that can provide the noise information? Could anybody point me into some direction how I could get a reasonable noise measurement with any standard WiFi chipset.