Help in OFDM Simulink block to plot complementary cumulative distribution function (CCDF)

Hello there. I need to plot the CCDF in the context of an OFDM channel. To do so, I had to model the OFDM modulator block given in the JPEG file attached. You may access the OFDM modulator block to see the inside and get a better understanding. I couldn't find a non-linear amplifier block, so I resorted to the one in the SimRF/Simscape library. To convert to sinusoidal RF signal from the complex number output of the OFDM Modulator, I used Inport and Outport- the standard procedure.

But when I run the Simulink Model, I'm getting an error which says, "Transient Simulation for a pseudo-periodic input", and the source of the error is unknown. I changed the Solver to a continuous state one as well, but it was futile. I'm looking for a way to get past this issue. If not, I'm open to other ways to model this Simulink block, so I wouldn't have to use SimRF/SimScape. Please Help! Thanks in advance!

[John Griffin]

I too am woundering about this!