4-QAM Constellation Diagram

Discussion in 'Homework Help' started by Melectro, Feb 6, 2012.

  1. Melectro

    Thread Starter New Member

    Feb 6, 2012

    Below I'm attaching the preview picture of two constellation diagrams for 4-QAM modullation:


    Could you show me the main differences between this two constellations diagrams?

    Does the structure of these diagrams is associated with polarization of input quadrature digital signal?

    Obviously, I understand that there are different amplitudes and phases ;)

    Thank you for any help.