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how to generate real value ofdm?

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(joined November 2014)
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I am going to use Optisystem to simulate the RSOA with OFDM signal. However, the outputs of ofdm in optisystem are complex value, which cannot be used for RSOA? How can I generate real value baseband OFDM signal?

Thanks

Responses (6):

    • #15122
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      zsliu
      Participant

      I am going to use Optisystem to simulate the RSOA with OFDM signal. However, the outputs of ofdm in optisystem are complex value, which cannot be used for RSOA? How can I generate real value baseband OFDM signal?

      Thanks

    • #15162
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      Damian Marek
      Participant

      Hi,

      Start off with the OFDM Modulator and then place the Quadrature Modulator directly after it (Transmitters Library->Modulators->Electrical). It will combine the cosine and sine components into a single electrical signal.

      Cheers

    • #15168
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      zsliu
      Participant

      Dear Damian,

      Thank you for your reply. I thought I would have to use cosimulation with matlab to generate ofdm.

      thanks again

      • #15169
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        zsliu
        Participant

        Hi Damian,

        is it possible to set the frequency of Quadrature Modulator to 0 Hz in order to get a baseband signal? and how to set the quadrature demodulatr cutoff frequency?

    • #19495
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      Shivi Singh
      Participant

      I made a Matlab code for QAM modulation to be used in OFDM. I am getting a error :
      Reference to non – existent field ‘Sequence’
      I wrote the program according to the samples given , so please explain how to remove the error and what does it mean.
      Part of matlab code :

      if strcmp(InputPort1.TypeSignal, ‘Binary’)
      cs = length(InputPort1.Sequence);
      end
      for m = 1 : cs
      e1(m) = InputPort1.Sequence (m)
      end

      In optisystem I have put PRBS generator in Inputport1.

      Attachments:
    • #25577
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      Gokul Boro .
      Participant

      Hi Shivi Singh,
      Could you solve the problem? If so please guide me too for the same. Thank you

    • #25631
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      Dhananjay Patel
      Participant

      How do we implement RSOA or REAM (Reflective eletro absorbtion modulator) in optisystem?

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