What is the sampling frequency of the output of the qammod/rectangularqammodulator?

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Meabh Loughman 2018-11-14

Hi All,

I am generating a signal using the following code:

num_of_points = 7000; %arbitrary

bits_per_point = 2;%arbritrary

binary_data = randi([0 1], num_of_points * bits_per_point, 1 );

modulator = comm.RectangularQAMModulator('ModulationOrder', 4, 'BitInput', true);

modulated_data= step(modulator, binary_data);

I am confused about the sampling frequency of modulated_data:

1) it is the symbol rate (fsym = 2Hz)

2)It is 2 the bandwidth of the signal (5MHz * 2)

3) I sample the output data using my own chosen sampling frequency divided by the fsym.

Really what I am asking is does anyone know how would you determine the sampling frequency of the output of the modulator?

Kindest Regards,

Méabh

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