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Information about RSSI

Posted: Fri Dec 29, 2017 2:23 am
by gabbas1
Hello,

I started a project where I want to detect objects with the value of the RSSI which can be found in the head of received beacon frames. According to IEEE, the measurement of the RSSI is vendor specific.

Where can I find any information about how the ESP8266 measures the Beacon RSSI? I look up the datasheets but couldn't find anything.
I wonder if there is any averaging using a vendor specific smoothing function? Is the value calculated linear or some kind of logarithmic? Is the value given in dBm?

Thank you!

Re: Information about RSSI

Posted: Tue Jan 02, 2018 8:47 pm
by iot-bits.com
According to the non-OS SDK, the RSSI is a number <10, and the value is signed. So the value should be in dBm I think. Makes no sense why it would just be a random integer.
How they calculate it is not known to me, but if you use a standard piece of hardware with a known method of calculating RSSI, and compare them side-by-side, you would know. The readings should not vary a whole lot, whatever the method.

Re: Information about RSSI

Posted: Wed Jan 03, 2018 8:29 pm
by gabbas1
Hi,

I was able to measure values from -23 to -98 with the ESP so is seams to be <10.
Having a reference device and measure side by side is a good idea, i will try this to find out more.

Thanks for this informations!