LTE-ROF using OFDM

Home › Forums › SYSTEM › LTE-ROF using OFDM

Viewing 14 reply threads
  • Author
    Posts
    • March 9, 2015 at 7:31 am #18429
      MONTCHO Marlise
      Participant

      Hello,
      I try to realize and analyse the performance of LTE-radio over fiber using OFDM modulation. Here is my simulation but i don’t find anything( constellation, BER…). Could you help me to find a mistake?

      Attachments:
      1. Mon-projet.osd
    • March 9, 2015 at 4:02 pm #18456
      alistu
      Participant

      I can’t open your file. Which OptiSystem version are you using?

    • March 9, 2015 at 7:01 pm #18458
      MONTCHO Marlise
      Participant

      Optisystem 13.0.2

    • March 10, 2015 at 4:10 pm #18489
      Damian Marek
      Participant

      Hello,

      I found a couple errors. One being the Filter wavelength which I changed. It is also a better idea to use the BER Test Set to measure the BER for OFDM because it has a section for disregarding the pilot symbols, training symbols etc.

      Regards

      Attachments:
      1. Mon-projet-Working.osd
    • March 10, 2015 at 11:16 pm #18497
      MONTCHO Marlise
      Participant

      Thanks Damian. My electrical constellation isn’t work. Could you help me to find errors . Thanks

      • March 11, 2015 at 8:41 am #18506
        Damian Marek
        Participant

        The visualizers in the project work for me. What is the problem you are experiencing?

    • March 11, 2015 at 9:15 am #18516
      MONTCHO Marlise
      Participant

      I don’t see anything in the screen for the both electrical constellation visualizer

      • March 11, 2015 at 9:18 am #18520
        Damian Marek
        Participant

        Is it possible you have not rerun the simulation? I did not save the data in the visualizers when I uploaded it here.

    • March 11, 2015 at 10:32 am #18536
      MONTCHO Marlise
      Participant

      Here is what i get after simulation. Is it correct?

      Attachments:

      1. image2.png

      • March 11, 2015 at 11:27 am #18538
        Damian Marek
        Participant

        Ah I see, actually that is correct! The reason you only get 4 points is because the detection of the signal has already taken place in the OFDM Demodulator and the M-ary signal has been regenerated. The regenerated signal is “perfect” from a noise perspective, so the symbols are coincident.

        +1
    • March 11, 2015 at 3:34 pm #18548
      Ravil
      Participant

      Your diagram is looking good, it has negligible BER!

    • March 11, 2015 at 5:54 pm #18555
      MONTCHO Marlise
      Participant

      Thank you Damian Mareck and Ravil for your explanation . In fact it is a work I have to present, so I don’t know if you have documents about the operation of Ber Test Set, the parameter ”Sequence length for BER per iteration,” and why it is better to using the ”Ber Test Set instead” of the ”eye diagram analyzer” or the ”BER analyzer”, the reason why the Bessel Optical Filter at 15 GHz was used instead of (2 * 2.6GHz= 5.2 GHz, theorem of Shanon), the role of connecting the OFDM modulation and OFDM demodulation block by a link , the advantage of using OFDM blocks directly in the optisystem instead of implementing it in matlab and do the cosimulation with optisystem … I need these elements to better master my work and by the way, better justify the results. Thank you for your help

      +1
    • March 14, 2015 at 12:18 pm #18662
      feras
      Participant

      hello everybody , i am working on a project like this , but i do not know how to simulate the up-link in LTE-ROF can any body help me please , how i can simulate full-duplex LTE-ROF .

      • March 24, 2015 at 4:41 pm #18971
        Damian Marek
        Participant

        Try looking at our tutorial on the bi directional fiber and components.

    • March 16, 2015 at 3:06 am #18740
      Ajay Vyas
      Participant

      I am using optisystem v 13.0 your project file is not open?

    • March 16, 2015 at 3:08 am #18741
      Ajay Vyas
      Participant

      can send the image of LTE R0F link or export in Lower version

    • March 19, 2015 at 12:58 pm #18884
      feras
      Participant

      hello,
      i haven’t any link in lower version , the LTE uplink depend on SC-FDMA and i can’t simulate this in optisystem

    • March 27, 2015 at 2:54 am #19040
      Ajay Vyas
      Participant

      Greeting for day!!
      As per our previous discussion I am working on nonlinear reduction technique for RoF link.
      I try to develop the different RoF link . I try to develop the Wimax –RoF but there are some problem to get the output as you mentioned.
      Please provide me some guidance regarding same

      Attachments:
      1. Wimax-Via-RoF.osd
    • September 4, 2015 at 7:05 am #24332
      Farhad Hagh Panah Shirvan
      Participant

      Hello Damian,

      I working on a very similar project. How can I use “OFDM Modulation (OS12)” instead of current “OFDM Modulation” in the osd file you reformed? My project has been attached to this message. I would be grateful if you would kindly help me out.

      Best regards,

      Attachments:
      1. LTE-RoF.osd
  • Author
    Posts
Viewing 14 reply threads
  • You must be logged in to reply to this topic.