RF System simulation.

Is ADS ptolemy simulation good for RF system simulation with baseband processing?

ADS2003 is good for design RF circuits.

I actualy use matlab to generate the baseband signal to test the amplifier, mixer. I save the baseband signal from matlab to files and let ADS read them.

Yes, I can say that ADS Ptolemy is a good system simulator. I am using for CDMA/WCDMA ACPR simulation, and correlates very well with final measurements. But is very, very slow.
regards

In my opinion, if you can gain access to ADS, it would be better. I feel ADS is excellent for RF.

I think A@D@S is't so bad but too much complicated for using.
Regards

How about ADS2004a?

i think @DS is one of the best chosies for system simulation from RF to baseband

every minulator has its own powers ans disadvantages . use one , which you know better and everythings'll be ok :)

How about "ansoft designer"? i think it's a good chioce!