Received Signal Strength Indicator (RSSI) is a measure of the received signal power at the antenna and is usually a negative number expressed in dbm for IEEE 802.11 devices.
My questions are:
Does RSSI take account the power of noise? Or is it just power of the signal? If it doesn't take into account power of noise, then how can one distinguish whether there is noise or not?
Does RSSI take into account the transmit and receive antenna gain?