Home Forums SYSTEM Constellation diagram of BPSK and QPSK

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    • #41845
      Abhilash Achanta
      Participant

      Hi all,

      I am doing an analysis of different modulation schemes in an RoF link.

      For BPSK and QPSK I am getting a very bad constellation at the transmitter end itself(Screenshots of layout and visualizer attached). What could the problem be ?

      Appreciate your help.

    • #41858
      adnan sabbar
      Participant

      Kindly attach your optisystem file to solve your problem

      • #41859
        Abhilash Achanta
        Participant

        Hi Adnan,
        The constellation diagrams at the transmitter end are okay now.

        At the receiver end, BPSK and 8-QAM are not as expected.

        Please find screen shots and simulation file attached.

        Thanks for the help.

        • #41874
          Damian Marek
          Participant

          Start from one of our square 8QAM examples, it looks like you modified one of our Star QAM, as the the QAM Sequence generator is set to Star type of constellation.

        • #41882
          Abhilash Achanta
          Participant

          Damian,

          I checked the graphs that are generated in OFDM demodulation component and they resemble 8-QAM scheme (I saw one of your post which says this, Thanks!)

          Please find the constellation diagram attached

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