Recommended received noise value for ray tracing scenario

[charaf412]

Hello,

I used this ray tracing tutorial to calculate the channel gains. Now, I would like to calculate my SNR. For that, I need to know the variance of the ambient noise (received noise).

What is the recommended value for this type of scenario?

Thank you.

[jhoydis]

The thermal noise power is typically computed as $W N_o$, where $W$ is the bandwidth in Hz and $N_o$ is the noise power spectral density. $N_o$ depends on the temperature: $N_o=k T$, where $k$ is the Boltzmann constant and $T$ the temperature in Kelvins (K). A typical value would be $T=293$ K (which is 20 degrees Celsius).

You would also need to assume a transmit power P. The SNR would then be computed as
$SNR = \frac{g P }{W N_o}$
where $g$ is the channel gain.