Communications Toolbox

Plotting a Signal Constellation

The modmap function plots and labels the default square signal constellation having M points. The constellation that inphase and quadr determine looks the same, except that the points are labeled from left to right across each row in the diagram, starting with the upper row.

• % Plot signal constellations with Gray code labeling.
  modmap('qask',M);
  

Computing and Displaying Bit Error Rates

Output from the Example