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Coherent OFDM

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(joined April 2014)
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Why the BER equals 0 in all coherent OFDM examples in the dvanced modulation Folder !
Thanks

Responses (31):

    • #15748
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      Fady
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      Thanks Jaffar, I am working on the example of coherent OFDM in the advanced modulation folder in optisystems samples.

    • #16143
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      Fady
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      Could you please post any example where you get good BER results as all BER resulsts of the examples in the samples folder are not useful.
      Thank you

    • #16144
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      Fady
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      Could you please post any example where you get good BER results as all BER results of the examples in the samples folder are not useful.
      Thank you

    • #16145
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      Hi Fady

      I attached you an UWB-OFDM WDM system and it is working very good. you can remove the UWB channel and work with OFDM system

      Attachments:
    • #16157
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      Fady
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      Thanks Jaffar, but the Min BER in your system is 0.496 with or without UWB.

      • #16371
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        Damian Marek
        Participant

        Hi Fady,

        Using Jaffar’s project I get a low Ber of 1e-18. Which version of OptiSystem are you using?

        Regards

    • #16158
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      Dear Fadi
      I got the results above from this file which is built using OpitSystem 13.0. Check your simulation I dont know where is the error

    • #16395
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      Fady
      Participant

      Hi Damian,
      The results were obtained using optisystem 13. Thanks

      • #16404
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        Damian Marek
        Participant

        Have you changed any of the layout parameters? It still doesn’t work?

    • #16448
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      Fady
      Participant

      I have not changed any parameter, it is still not working. Thanks

      • #16489
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        Damian Marek
        Participant

        Hi Fady,

        Could you take a screenshot of the simulation with the BER result circled?

        Regards

    • #16600
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      Fady
      Participant

      Thanks Damian, Please find the attached screenshot of the BER result.

      Attachments:
      • #16612
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        Damian Marek
        Participant

        Can you attach it as a jpeg or png please?

    • #16692
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      Fady
      Participant

      Please find the attached jpeg screenshot

      Attachments:
    • #16719
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      Damian Marek
      Participant

      Ah ok, I was looking at the UWB receiver. In this case I would set the BER Analyzer to use the Measured algorithm, because the eye diagram won’t give you an accurate BER estimation. The reason being the binary sequence has been regenerated at the output, since you can’t really view the eye diagram of an OFDM signal.

      If you look at the eye diagram you will notice that it is a “perfect” eye diagram with no deviation and no noise. In this case the BER estimation will not reflect reality.

      Cheers

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