Fade Margin

FADE MARGIN

Fade margin is the amount by which the RSSI can be reduced without causing system performance to fall below a specified threshold value .

In easy words fade margin can be expressed as the RSSI above the sensitivity of the receiver.

e.g  

If the sensitivity of receiver is -80 dbm and the received signal is -65 dbm then the fade margin will be 15 dbm .

From above example we can say that greater the fade margin , more reliable the link.