Hi.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1129102926/0#0It is difficult and not so helpful to relate IP3 to EVM analytically
since EVM is affected by not only AM/AM(IP3) but also AM/PM... etc.
I think you should build system model to survey various effects.
But this is dependent on your availability of EDA tools.
I use Agilent ADS Ptolemy and WTB in both ADS_Native and RFDE for this purpose.
http://eesof.tm.agilent.com/pdf/wlan.pdfIf you can prepare UWB or 802.11a signal and measurement for Cadence Environment,
you can do same system design study also in Cadence Environment.
For this purpose in Cadence Environemt, modeling candidates for signal and measurements are Verilog-AMS, MATLAB, SPW etc. in AMS Designer.
If you will do only simple system characteristics such as ACPR and EVM, Spectre with Verilog-A might be helpful.
But for full system characteristic study, I think it is very difficult and laborious to bulid models using only Verilog-A.
See Cadence RF Design Methodology Kit
http://www.cadence.com/products/kits/RF_Design/index.aspx