How do you plot a constellation diagram in Matlab?

How do you plot a constellation diagram in Matlab?

Create 32-QAM Constellation Diagram Use the qammod function to generate the 32-QAM symbols with binary symbol ordering. M = 32; data = 0:M-1; sym = qammod(data,M,’bin’); Plot the constellation. Label the order of the constellation symbols.

What is IQ modulator?

An IQ modulator is a device that converts baseband information into RF signals. Internally, two double-balanced mixers are combined as shown below. By modulating with both in-phase (I) and quadrature (Q) inputs, any arbitrary output amplitude and phase can be selected.

How to map constellation using 16-QAM modulation?

Apply 16-QAM modulation to complete sets of constellation points by using natural-coded binary symbol mapping and Gray-coded symbol mapping. Use the scatterplot function to plot the constellation diagram and annotate it with natural (red) and Gray (black) binary representations of the constellation points.

How do you plot a QAM constellation with 32 points?

Plot the constellation. This example shows how to plot a QAM constellation having 32 points. Use the qammod function to generate the 32-QAM symbols with binary symbol ordering. Plot the constellation.

How to modulate random data symbols using QAM?

Set the modulation order to 16 and create a data vector containing each of the possible symbols. Modulate the data using the qammod function. Display the modulated signal constellation using the scatterplot function. Set the modulation order to 256, and display the scatter plot of the modulated signal. Modulate random data symbols using QAM.

What is the bit error rate of the QAM constellation?

The binary coding bit error rate is 2.40e-03, based on 72 errors. The Gray coding bit error rate is 1.33e-03, based on 40 errors. The constellation diagram shown previously plotted the points in the QAM constellation, but it did not indicate the mapping between symbol values and the constellation points.