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RSSI & Noise Floor Explanation

Panoramic sensors transmit measurements to a nearby bridge wirelessly. For those transmissions to be received and interpreted by the bridge, the signal received by the bridge needs to be strong enough to overcome the electromagnetic noise.

 RSSI: received signal strength indicator (RSSI) is a measurement of the signal power present at the measured frequency.

Panoramic Power sensors transmit modulated signal to the bridge which demodulate the received signal to interpret the measurement data it contains. The RSSI level should be between -30dBm and -75dBm. However, to ensure successful demodulation of the signal the reception level should also meet a minimum Signal to Noise Ratio (SNR). For PowerRadar sensors the received SNR should be between 30-40dB, considering that the signal level may decrease, and that Noise Floor level may increase from time to time due to the dynamic environment.


SNR is the difference between the received signal strength indicator (RSSI) and the Noise Floor.

Noise floor Is the sum of all the electromagnetic noise sources and unwanted signals at the relevant frequencies, where noise is defined as any signal other than the one being monitored.


In PowerRadar you can find the Noise Floor for each bridge on the Bridges & Loggers table.