If the noise power at the laptop is 86 dBm what is the SNR

. If the noise power at the laptop is -86 dBm, what is the SNR in dB?

Solution

SNR or Signal to Noise Ratio is the difference between the background noise level (also called Noise floor or Noise power) and the received signal .You have not provided the value of the received signal here .

for example :

If the noise floor is -70 dBm and the received signal is -50 dBm.

The Signal to Noise ratio (SNR) will be (-70dBm) - (-50 dBm)= -20dB.

Please note that SNR is measured in dB’s, not dBm’s.

So in ur case if the received signal is X

then SNR will be -86dBm-(X dBm)= (-86-(X))dB