Hi guys!
We are just starting on this thing of multiuser communications, and we have some doubts about the BER performance,it´s about 0.5 and doesn´t improve while we increase the Eb/No from bertool as is expected, we are so out of clues here so if you could help us we´ll be very pleased! here I attach the .mdl file, my email es hernandellam@hotmail.com

Thanks in advance!!!