Information about RSSI

gabbas1
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Joined: Fri Dec 29, 2017 2:07 am

Information about RSSI

Postby gabbas1 » Fri Dec 29, 2017 2:23 am

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!

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iot-bits.com
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Re: Information about RSSI

Postby iot-bits.com » Tue Jan 02, 2018 8:47 pm

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.
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gabbas1
Posts: 2
Joined: Fri Dec 29, 2017 2:07 am

Re: Information about RSSI

Postby gabbas1 » Wed Jan 03, 2018 8:29 pm

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!

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