How does SimRF circuit-envelope simulation envrionment model noise in time-domain?

Hello,

After searching the help and online manual, I found that noise modeling in SimRF circuit-envelope simulation environment are basically done by calculating the equivalent noise temperature.

However, the link from the noise temperature to the time-domain signal is unclear. Does anyone know how SimRF converts noise parameters (such as noise temperature, noise figure in amplifier and mixer blocks, resistance values for resistors) to a noisy time-domain waveform?

Thank you very much.

Ying-Chih