- This topic has 7 replies, 5 voices, and was last updated 9 years, 10 months ago by
Kübra Kayır.
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May 16, 2015 at 5:12 pm #20869
Kübra Kayır
Participanthello there
I am working co-ofdm for thesis.I used 4-QAM but I want to change 16-QAM.I tried but it did not work.how can I do it?please help me. -
May 18, 2015 at 10:30 am #20892
Ashu verma
ParticipantHello kubra
you can use 4 bit per symbol to make 16 Qam ,but your constellation may not appear correctly due to noise.You can see the optiwave examples for reference as they have given many examples on this topic.I have given a link ,check this
Moreover in new system DSP component added to compensate the non linear effects and dispersion effects .These components very much effective to get the constellation at visualizer.-
May 21, 2015 at 8:30 am #21021
Kübra Kayır
ParticipantHi Sam Sung
Thanks for reply.it would be helpful.now my other problem is I want to add Eye Diagram but I did not.can you help me about it?
Best
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May 18, 2015 at 10:34 am #20894
alistu
ParticipantHi Kubra
Could you tell me the version of Optisystem you are currently using? There appears to be a bug in CO-OFDM sample and particularly in OFDM blocks in Optisystem versions older than version 13. You may want to take a look at this:-
May 21, 2015 at 8:22 am #21020
Kübra Kayır
ParticipantHi alistu
I am using version 13.thanks for link.
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May 18, 2015 at 8:46 pm #20911
Ravil
ParticipantHi Kubra,
The general idea according to your question is given by Sam Sung (his link gives you a general idea about the specific of QAM). Please, take a look at the links provided by Optiwave, i.e. https://optiwave.com/resources/latest-news/new-version-optisystem-12-2/ and etc. Your question has been discussed during past forums as well. The links for them are provided below:
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May 19, 2015 at 1:15 am #20919
Ajay Vyas
ParticipantHi Kubra
Firstly you under stand the parameter of OFDM modulator then very it for 16 QAM and high order of modulation scheme. Used same filter and amplifier at receiving side to improve the results -
May 19, 2015 at 9:02 am #20937
Ashu verma
ParticipantThank you Ravil for supporting my point,please correct me, if anywhere need to be corrected. As you are senior member of this forum
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