Abstract: An emulator for modeling a network of K transmitters, L receivers, and M multipath components using a product distribution modeling system. The emulator determines for each of MLK paths defined between the transmitters and receivers respective delay, loss, and fading components. The fading component (e.g., attenuation-based, multipath, or both) is determined by calculating a weight value of a time-varying random variable type for each input impulse associated with the K transmitters and for each output impulse associated with the L receivers (including multipath). The modeling subsystem determines a signal propagation value for a modeled communication channel among the MLK paths by combining the delay component, the loss component, and the respective weight values of the input and output impulses associated with the modeled communication channel. The testing subsystem uses the signal propagation value to emulate the modeled communication channel using one or more computer processors.