In terms of definition, SNR or signal-to-noise ratio is the ratio between the desired information or the power of a signal and the undesired signal or the power of the background noise. … Also, a ratio greater than 0 dB or higher than 1:1, signifies more signal than noise.

How do you interpret signal-to-noise ratio?

SNR is expressed in decibels. It is calculated by dividing the signal power by the noise power. A ratio bigger than 1 dB indicates that the signal is more than the noise. Conversely, if the ratio is less than 1, it indicates that the noise level is bigger than the signal level.

Is SNR bad?

An SNR greater than 40 dB is considered excellent, whereas a SNR below 15 dB may result in a slow, unreliable connection.

SNR directly impacts the performance of a wireless LAN connection. A higher SNR value means that the signal strength is stronger in relation to the noise levels, which allows higher data rates and fewer retransmissions – all of which offers better throughput.