Simulink - QPSK Modulation

Hello everyone!

Being new to matlab I 've been struggling to simulate QPSK modulation for the IEEE 802.15.4 in Simulink. So, I generate a random integer number from 0-15 which in order to convert to binary i pass through a integer to bit converter block with an output of 4 bits. Then I want to map the output to 32 bit sequences and that's where the problem starts.

I am trying to do that by adding a Lookup Table but the result is not looking that great. Where am I going wrong? And in addition to that is there a way to check the integer to bit block's output?

Any help would be valuable!

Thanks
Teo
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