Re: Somethings about RSSI
RSSI can be used as a tool to give an indication of link quality, but not always give good results. The received signal level can also be affected by in-band interference sources. So, a strong signal level can be reported, but data can be corrupted. To compensate for this some systems use loopback data transfer in parallel with RSSI reading.
RSSI circuit can be used also as a log detector. For some circuits this log detector is very accurate, and the dynamic range can be up to 100dB.