Received signal strength indication Received signal strength indication In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal. RSSI is usually invisible to a user of a receiving device. However, because signal strength can vary greatly and affect functionality in wireless networking, IEEE 802.11 devices often make the measurement available to users. RSSI is often derived in the intermediate frequency (IF) stage before the IF amplifier. In zero-IF systems, it is derived in the baseband signal chain, before the baseband amplifier. RSSI output is often a DC analog level. It can also be sampled by
EMC problem (excessive field strength) unwanted signal. If however the unwanted signal is stronger than the wanted signal then it is likely that the receiver will be unable to demodulate the wanted signal. This is related to the normal method of jamming FM systems, to jam an FM signal it is normal to transmit a signal which is 10 dB stronger (at the front end of the target receiver) and is within the plateau of most narrow IF stage. If an electronic device with a long coaxial aerial lead is disturbed by a signal from a HF transmitter then the braid of the coaxial should