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Perhaps many of the members of the forum have previously simulated an RFID system. But your question is really unclear. that's why nobody replies. I'm not very expert, but if you answer the following questions maybe somebody can help you:
1- what is the operational frequency of your system? 135kHz, 13.56MHz, 900MHz or 2.45 Ghz
2-Are you going to simulate the reader, the tag, or the wireless link?
3- In the reader, are you going to simulate the power amplifier or the demodulator?
4- Is your tag passive or active?
...
since you are going to simulate the whole system simultaneously (which I doubt you can do it) your main problem would be convergence of the simulations. Since your system works at low frequencies, I suggest using HSPICE (but I have also used cadence and pspice but I did have convergence problem with them). Start as follows:
1- first design and simulate the power amplifier of the reader. A class E or D may better work for you.
2- consider a coupling coefficient of about 0.01 (as an example) between the transmitter and tag coils, and then start the design and simulation of the tag.
3- then use a very simplified model for the tag (just consider the load modulation in the tag and ignore other blocks ) and start the design and simulation of the data detector.
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