MATLAB: Is there any command by which we can plot the constellation points with arrows in between?

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qam_modulated_data = qammod(data_source, M) %here we perform 8bit qam on the random normal function scatterplot(qam_modulated_data) here we get only points.

Which command should be used to get lines in between the points so that we can determine the distance between two points?

Best Answer

Maybe try the grid on command it will generate a graph sheet so easier to compare distances.

scatterplot(qam_modulated_data)
grid on   %To make the plot on graph

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MATLAB: How to make an array with the constellation point of qam

MATLAB: How to plot the constellation diagram for a binary FSK modulator

M-FSK constellations are M-dimensional and hence the method is not available to it. But as long as you are working with binary FSK, you can use comm.ConstellationDiagram or the scatterplot function to visualize a 2-FSK constellation. Below is an example:

>> modulator = comm.FSKModulator(2, 1000);
>> data = randi([0 modulator.ModulationOrder-1],50,1);
>> modSignal = modulator(data);  
>> scope = comm.ConstellationDiagram('ShowReferenceConstellation', false);
>> scope(modSignal);

However, it is important to note that even an ideal 2-FSK constellation will rotate in one direction or the other (clock- or counterclock-wise), and the direction cannot be inferred from the constellation.Therefore the constellation will not really be insightful, except for depicting the impact of impairments.

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MATLAB: How to make an array with the constellation point of qam

MATLAB: How to plot the constellation diagram for a binary FSK modulator

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