Is there any software that can simulate wireless circuits?

Hai every one ,

I want to simulate wireless circuits on PC before making an hardware.., so please help me if there is any software for that, and it should include WiFi, RF, BLUETOOTH, XBEE etc., or at least support for any one of them.
thank you

Now depends by your budget. Some of the programs cost the same as a Porsche 911 Carrera

http://www.home.agilent.com/en/pc-12...0&cc=RO&lc=eng
http://www.home.agilent.com/en/pc-12...?&cc=RO&lc=eng
http://www.awrcorp.com/products/microwave-office
http://www.cadence.com/products/rf/Pages/default.aspx