How does UWB Environment work?

Hi,

I am trying to make out how the communication channel works in the example - UWB_PULSES.
In the help there is very little information about the PropagationLoss block.Can you tell me an article or book that describes the mathematics for the description of the channel?

In thehelp（http://edadocs.software.keysight.com/display/ads2008U2/UWB%2BENVIRONMENT) there is very little information about this example and especially about the channel. I would be grateful for any additional information.

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