Apply MIL-STD-188 QAM to a signal of random data. Pass the modulated signal through an AWGN channel. Plot the signal constellation.
cm_ex_mil188_qam_mod model with the EbN0 of the AWGN channel block set to 20 dB.
Change the EbN0 of the AWGN channel block to 10 dB. Run the model and observe the increase in noise.
Adjust the modulation order in the
MIL188-QAM Modulator Baseband block. Before you run the model, you must also adjust the workspace variable
M, defined in
InitFcn to match the modulation order in the
MIL188-QAM Modulator Baseband block. The variable
If these parameters are not aligned with each other you will notice that the reference constellation and input signal do not produce the desired constellation.