Have i done this right? OFDM spectrum

Guys, i've finished my basic ofdm model and i'm currently working on
the synchronization & later the modelling of the power line transfer
function...

But i just wanna check out with you guys first whether my spectrum is
correct or not...

This is my model (50kb), the AWGN SNR is set at 30...
http://geocities.com/antonio_magma/model.jpg

And this is my output Tx spectrum, averaged about 50 samples
(50kb)
http://geocities.com/antonio_magma/fft.jpg
Notice that i have a deep notch at the 0, its because i have 3 zeros on
both sides of the Fs...

Please comment...thx guys...