Home Forums SYSTEM BER analyzer

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    • #27074
      Monika Mehra
      Participant

      I download the file from optiwave site .I want to see the results using BER analyzer . I find the two methods to connect the BER analyzer but I am not getting the good results. I am attaching my files kindly check whether they are correct or not or how to improve the design

    • #27076
      Dr. Dhiman Kakati
      Participant

      I also faced same kind of problem as you. then I find that we can use the BER test for calculating the bit error rate.you can go through the examples that are available in the C:\Documents\OptiSystem 13 Samples\Advanced modulation systems\PSK systems\QPSK\ folder there are many examples.

      I have attached here a sample

      Regards

    • #27078
      alistu
      Participant

      Hi Monika,

      You have connected the BER Analyzer correctly. You can use the DSP component to improve the system performance and have results in BER analyzer. I have used the component before threshold detectors in your own file and you can see the min.BER zero has been achieved. Please see the attached file.

      Regards

    • #27084
      Dr. Dhiman Kakati
      Participant

      Dear Alistu the Q factor seems to be pretty good but eye diagram is not that clear.

      Regards

      • #27101
        alistu
        Participant

        Hi Dhiman,

        You’re right. The BER Analyzer does not show a clear eye-pattern, but the decision instant is at 0.9 bit period and it can be seen that the eye opening is very great around that time instant. So that is why in the BER calculations, a very good Q-factor and bit error rate have been achieved.

        Regards

        • #27104
          Dr. Dhiman Kakati
          Participant

          Alistu, I think,The Q-factor and BER is calculated mathematically and not from from the eye pattern.

          Regards

        • #27106
          alistu
          Participant

          Please see the following pdf (which Heitor had formerly attached in another forum topic) regarding how the Q-factor is calculated and how it is related to the eye pattern characteristics. There is an image on page 3 on the file that demonstrates it along with the formulas used in the context which might be of interest more specifically.

          Regards

    • #27115
      Dr. Dhiman Kakati
      Participant

      Thanks Alistu..

      Regards

      • #27116
        alistu
        Participant

        You’re welcome.

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