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Error vector Magnitude

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(joined May 2014)
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Dear,
If i use Decision component from Demodulator/Receiver Library for DP-QPSK Rx after DSP.
and EVM is 6.34% ,How can i expect BER?

Responses (8):

    • #13659
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      Abdallah Ismail
      Participant

      Dear,
      If i use Decision component from Demodulator/Receiver Library for DP-QPSK Rx after DSP.
      and EVM is 6.34% ,How can i expect BER?

    • #13673
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      Abdallah Ismail
      Participant

      In another words what the values of EVM that is acceptable?

      • #13692
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        Damian Marek
        Participant

        There is not a simple relation between EVM and BER, because depending on the constellation diagram the EVM could have a larger or smaller impact. Closely packed constellation diagrams with the same EVM will likely have a worse BER.

        Searching for papers, I came across this one that aims at relating the two quantities. From a quick glance I’d say less that 10% EVM is critical for a quality system.

        http://www.ee.ucl.ac.uk/lcs/previous/LCS2000/lcs057.pdf

        Regards

        +3
        • #26039

          Dear Damian I got a relationship between BER and EVM in one paper. Please find the attache image and pdf.

          in the attached iamge Q() is the Gaussian co-error function and is given in the 2nd attached image.
          and in the pdf page no 263.

          Thanks.

          Regards

          +2
    • #14149
      Ajay Vyas
      Participant

      Hello sir
      We are using optisystem 13 version . We areworking on RoF how We can Measure EVM & ACPR

    • #25772

      I am also unable to calculate, only I got the theoretical concept and mathematical expression so please anyone help.

      Regards

    • #25773

      Dear Ajay, In which paper you are you are working.
      I am asking you me also working on the ROF full duplex communication.

      Regards

    • #35743

      Hello Everyone I am attaching herewith 2 snapshot to let you know how you can see by tick marking the EVM (%) for Decision Components result.
      This is the easiest way to find EVM. Thanking you.

      Regards,
      Dhiman

      Attachments:
    • #41886
      Profile Photo

      I am sending you the attachment of “Decision” component but there isn’t any option of calculating EVM. I am using opti system version 14.

      Attachments:
    • #69710
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      (Awaiting moderation)

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