Forum Replies Created

    #23763
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    ali
    Participant

    i attach constellation+BER result

    #23730
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    ali
    Participant

    I sent the file

    With these changes CONSTELLATION no better

    #23726
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    ali
    Participant

    i said,”in section ofdm mod. no appear item pilot symbols ” I mean, change the parameters IN ofdm modulator
    but appear pilot symbols in section BER test set
    if possible Changes you saying apply in sent my file?

    #23721
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    ali
    Participant

    i use optisystem 13.
    in section ofdm mod. no appear item pilot symbols .
    if possible Please help clear
    thanks

    #23717
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    ali
    Participant

    i do not have key but do if format hard Problem solved

    #23711
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    ali
    Participant

    hi
    You will have no problem using version 13
    Version 13 to use

    #23709
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    ali
    Participant

    in section “BER TEST set properties\ofdm parameters\pilot symbols” i do change pilot symbols and change other parameters in the section but no better result.

    #23704
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    ali
    Participant

    hi alitsu
    To resolve the problem with the length of the fiber, and even more, what should I do?

    #23685
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    ali
    Participant

    hi
    Why file attached with high O.S.N.R but is bad performance? What are the defect?

    #23671
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    ali
    Participant

    hi alitsu
    some questions
    1- bit rate is set in two places, one in the global parameters and other in the PRBS GEN
    What’s the difference?
    is have a relationship with toghter?
    Because if change bit rate in global parameters result BER is different
    2-One advantage of ofdm set cyclic prefix for avoid isi
    Where should determine this parameter?i change in ofdm mod. but i did not see change in the BER
    3-where i do download optisystem 13.0.3 ? because i have v. 13.0.2

    #23651
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    ali
    Participant

    Very good’ve described.
    Thank you

    #23649
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    ali
    Participant

    hi alitsu

    you said:The reason for the BER=1 in one of the channels is the symbol rotation problem
    But the constellation diagram does not show large spin.
    The number 110 seems a little difficult to guess.
    You can give me a little guide?

    #23645
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    ali
    Participant

    Hi alistu
    No, I mean, you said it was not
    I mean, the question was why the symbol (1) in the third quarter numbers did you?
    Do you come from experimentation to -145 number? Or did the calculations?
    thanks

    #23639
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    ali
    Participant

    hello alistu
    How did Marking symbol?
    Why did you symbol into these numbers?

    #23315
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    ali
    Participant

    thank you alistu
    Is simulation file in this case that would help me do you know?