4-QAM Constellation Diagram

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

  1. Melectro

    Thread Starter New Member

    Feb 6, 2012
    1
    0
    Hello,

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


    [​IMG]

    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.
     
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