LTE-ROF using OFDM

This topic has 17 replies, 6 voices, and was last updated 9 years, 8 months ago by Ajay Vyas.

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- 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?
- 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
- 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?
  - 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.
- 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
- 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
- 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,
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