ADS as system level environment

Hi friends,

I am working on a wireless project which needs to simulate at a high level model because of verification activities. Therefore, I am going to introduce ADS as a system level environment, but i did not find any articles which explain more about mixed design.
Could anyone give me a practical mixed design example (i mean a design includes RF and DSP) based on ADS?
Also i have another question about ADS. As i see it is not only a system level design tool but also is a module or circuit level design tool. isn't it? Please explain more about how circuit level design can be done and how accurate it is.

Thank you in advance

I want to do a UWB transciver system simulation about vedio,how can i do ?and how the UWB designguide in ADS' licence define?
best wish to you!