I am sorry I couldn’t simulate it with Matlab. I have attached what I tried though just to introduce the idea. The PRBS is used just to give initial initial values. I used three Matlab components. the first one just introduces a counter named “c” and also sends the initial signal to the modulators. Matlab component on the bottom left only takes the initial signal for the first time and the next times, it gets the signal from the fork (as it has to). Matlab component on the right only takes the values obtained from upper system (which works just for the start and works with initial values). I don’t know why it doesn’t work. And I don’t say the use of Matlab is by any means necessary in your case. It was just something that came in my mind..