OFDM , QAM 64

Home › Forums › SYSTEM › OFDM , QAM 64

Viewing 6 reply threads
  • Author
    Posts
    • February 21, 2015 at 3:48 pm #17679
      Mohamed Ajina
      Participant

      Can you find a mistake in the attached circuit
      I can not get the correct results

      Attachments:
      1. QAM-644.osd
    • February 21, 2015 at 10:13 pm #17683
      Ravil
      Participant

      Hi Mohamed,

      Unfortunately, I can’t open your file with my version of OptiSystem. Do you have a chance to upload a screen shot?

    • February 22, 2015 at 6:18 am #17693
      Mohamed Ajina
      Participant

      Hi Ravil

      You may use the software version 13.0.1 or 13.0.2

      Attachments:
      1. QAM-641.osd
      • February 23, 2015 at 9:44 am #17714
        Damian Marek
        Participant

        Hi Mohamed,

        I noticed in your file you are using the older OS 12 OFDM Mod/Demod. In the recent update 13.0.2 the components were changed and I suggest you use them if you have access to them. They are much more robust!

        Regards

    • February 28, 2015 at 3:46 pm #17938
      Mohamed Ajina
      Participant

      Hi Marek

      Am I using the OFDM correct & The correctly results ?
      ( QAM 16 )

      Regards

      +1
      • March 2, 2015 at 8:54 am #18016
        Damian Marek
        Participant

        The BER is 1 and generally for higher modulation and OFDM the BER Test Set is a better tool to use. Your project looks fine besides that, but I would really suggest the newer OFDM components.

    • March 17, 2015 at 6:57 am #18803
      Mohamed Ajina
      Participant

      Hi Marek

      I am asked how can I find the relationship between BER and OSNR (What is the method) ?
      note attachment

      Attachments:

      1. 99999.png

      • March 24, 2015 at 4:45 pm #18973
        Damian Marek
        Participant

        We have a tutorial on parameter sweeps that would help you out. In addition there is a WDM Analyzer component that will calculate the OSNR value for each sweep.

    • May 4, 2015 at 5:30 pm #20402
      Mohamed Ajina
      Participant

      Hi Mr. Marek

      In the design circle OFDM – QAM , why used single mode fiber (SMF)
      and why do not used Multi-mode fiber

      Regar

    • May 5, 2015 at 12:48 am #20414
      Dr Rk Sethi
      Participant

      Hi Mohamed Ajina,
      You can use Multi-mode fiber. It depends on the application.
      Normally, Multimode fiber will permit short transmission distances of up to about 10 miles and will permit the use of comparatively inexpensive fiber optic communication transmitters and receivers. It will be bandwidth limitations of a few hundred MHz per Km of length. On the other hand, SMF may be used for the transmission distance in excess of 10 miles but will need the use of Laser transmitters. The equipment for single mode transmission more expensive as compared to multimode equipment.
      Information carrying capacity = BW *Length
      MMSI 20MHz.Km
      MMGI 1GHz.Km
      SMSI 100GH.Km
      For more information you can refer:
      Fiber-Optic Communication Systems, 4th Edition. Govind P. Agrawal

  • Author
    Posts
Viewing 6 reply threads
  • You must be logged in to reply to this topic.