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CALCULATE THE BER OF OFDM

Home › Forums › SYSTEM › CALCULATE THE BER OF OFDM

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    • October 8, 2015 at 10:32 am #25975
      Alabbas Ahmed Abduljabbar
      Participant

      Hi everybody,
      Can anybody help me, i wanna to calculate the BER of the output of ofdm. i attached the file simulation.

      Best Regards.

    • October 8, 2015 at 10:43 am #26020
      alistu
      Participant

      Hi Alabbas,

      There is no attachment to your post. However, for this purpose you’d better choose the BER test set at the test set library of the Optisystem and tick the OFDM box in it. Then you have to set the parameters the same as the ones you have used in you OFDM modulator and demodulator components.

      Regards

    • October 8, 2015 at 12:27 pm #26031
      Prarthana Kashyap
      Participant
    • October 8, 2015 at 8:30 pm #26037
      Ajay Vyas
      Participant

      There are various method to calculate the BER at output
      You can use Eye diagram visualizer, BER visualizer, BER test.

      • October 9, 2015 at 2:56 pm #26115
        Alabbas Ahmed Abduljabbar
        Participant

        how can connect BER visualizer?

        THANKS

        Attachments:
        1. Direct-Detection-OFDM-4-QAM1.osd
        • October 10, 2015 at 1:45 am #26132
          alistu
          Participant

          Here I have attached an image of the BER analyzer being attached in your system. Perhaps Ajay could kindly check the connected BER analyzer and see why the BER analyzer doesn’t show the proper results, even though it is connected according to the way it should. Please download the attached osd file.

          Attachments:
          1. Direct-Detection-OFDM-4-QAM-BER-Analyzer.osd
        • October 10, 2015 at 9:38 am #26165
          Alabbas Ahmed Abduljabbar
          Participant

          thanks a lot for help me

          now i change some properties like sequence length and samples per bit and u can see the result in file attached
          but why cannot see the eye like picture attached

          Attachments:

          1. Untitled.jpg

          1. Direct-Detection-OFDM-4-QAM-BER-Analyzer-and-change.osd
        • October 10, 2015 at 10:23 am #26168
          alistu
          Participant

          I ran the simulation and your system seems to be giving a good eye pattern. I think the reason for it being not as thick as the one shown in the image you have attached (and also the reason for the Q-factor figure being somehow sharp) is the fact that the sequence length you have used is rather short.

    • October 9, 2015 at 8:43 am #26078
      Alabbas Ahmed Abduljabbar
      Participant

      thank all for reply

      sorry for confused, I attached the file now

      I need to see the Eye diagram and BER.. what is the method to connect BER Analyzer

      Regards

      Attachments:
      1. Direct-Detection-OFDM-4-QAM_A.osd
      • October 9, 2015 at 9:08 am #26084
        alistu
        Participant

        In the file you have attached, the BER Analyzer is correctly connected. The fact that it doesn’t show the desired results is probably due to some other problem in the system. I tried to decrease the sequence length in layout parameters (to increase samples per bit from 1 after that) and faced an error caused by OFDM demodulation component while the simulation was running.

        • October 9, 2015 at 9:30 am #26088
          Alabbas Ahmed Abduljabbar
          Participant

          SO What is the solution?
          Actually i wanna design ofdm wdm pon like the file attached but my problem in ofdm !!

          thanks a lot
          Regards

          Attachments:
          1. ofdm-wdm-pon2.osd
        • October 9, 2015 at 9:42 am #26094
          alistu
          Participant

          My simple suggestion is to start with OptiSystem DDO-OFDM sample and try to apply the changes to it step by step and try to get the desired results after each step. Otherwise, it may be hard to tell which part of the system causes the problem. Yours had some differences with the sample file, like the value of samples ber bit being one, which should be more.

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