edit the code of 4QAM to 16QAM

[jiajy0427]

hi, sir, thank you for your code, is there any possible way I can convert the code of 4QAM to produce modulation of 16QAM?

[TheWirelessClassroom]

hi, sir, thank you for your code, is there any possible way I can convert the code of 4QAM to produce modulation of 16QAM?

Hi, yes there is a way, but in fact you have to type in a bit more cases for 16QAM compared to 4QAM.
Basically you have to generate 4 random bits per realization as one 16QAM symbol is represented by 4 bits. The encoder has to be modified for your symbol constellation. An example can be found here https://en.wikipedia.org/wiki/Quadrature_amplitude_modulation#/media/File:Rectangular_constellation_for_QAM.svg
This can be achieved e.g. with a swtich-case environment.

The last part which has to be changed is the demodulator, as you now have more options on demodulation. The most intuitiv approach is to just calculate the eucliadean distance to all codewords and choose the one with the smallest distance (this is known as minimum distance decoding).

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