How exactly do I plot a constellation Diagram?
Typically a constellation diagram is not just the raw RF values because that would be extremely disorganized. You would end up with a bunch of points in a gaussian distribution about the origin (thermal noise) and a &quot;ring&quot; around it that represents your signal at any particular phase during the sampling.
What you typically want to plot is the baseband signal, the RF after it is filtered, mixed against the carrier wave, and coherent (phase-locked). This will indicate which constellation values are being received with some noise (hence why in Figure 7 they are scattered about the data positions). I have no idea what is going on in Figure 8, but it's not a constellation diagram. It looks like something of the author's own invention to better analyze the given data.