The signal strength of an out-of-channel interferer is estimated by measuring the transition density of the sign of the down-converted signal. RF interferers at a higher or lower frequency than the desired RF signal appear as high frequency content in the down-converted signal, thus increasing the likelihood...http://www.google.fr/patents/US7979041?utm_source=gb-gplus-shareBrevet US7979041 - Out-of-channel received signal strength indication (RSSI) for RF front end
Out-of-channel received signal strength indication (RSSI) for RF front end
