DPSK Modulator Circuit Help

Discussion in 'Homework Help' started by xKael, Sep 14, 2011.

  1. xKael

    Thread Starter New Member

    Jun 30, 2010
    I have a project wherein a transmitter and at least 2 receivers must be built. The project should use a digital modulating scheme, in this case, DPSK(Differential Phase Shift Keying).

    I have researched the WWW and found this website: http://www.electrofriends.com/articles/DPSK/index.html

    I submitted the MODULATOR circuit from the website since only the modulator circuit is needed for now.

    However, my professor told me that the circuit lacks something. The problem is I didn't know what it was. Can you help me on what's lacking?