The further a received signal is from the noise floor, the better the signal quality. Signals close to the noise floor can be subject to data corruption, which will result in retransmissions between the transmitter and receiver. For best performance in a wireless environment, it is key that wireless devices are able to distinguish received signals as legitimate information they should be listening to and ignore any background signals on the spectrum. There is a concept known as the Signal to Noise Ratio or SNR, that ensures the best wireless functionality. The SNR is the difference between the received wireless signal and the noise floor. The noise floor is simply erroneous background transmissions that are emitted from either other devices that are too far away for the signal to be intelligible, or by devices that are inadvertently creating interference on the same frequency.įor example, if a client device's radio receives a signal at -75 dBm, and the noise floor is -90 dBm, then the effective SNR is 15 dB. This would then reflect as a signal strength of 15 dB for this wireless connection.
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