Your questions are no more than usage of very specific vendor's simulator.
There is no issue related to "RF Measurement".
Please post to "Simulator's Board" not "Measurement's Board".
Your following post is also not related to "Measurement".
http://www.designers-guide.org/Forum/YaBB.pl?num=1262097621What vendor's simulator do you use ?
There are many simulators which have analyses called as PSS, PAC and Pnoise.
If you use Cadence Spectre, use PSS/PSTB.