- This topic has 12 replies, 4 voices, and was last updated 9 years, 2 months ago by alistu.
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October 8, 2015 at 10:32 am #25975Alabbas Ahmed AbduljabbarParticipant
Hi everybody,
Can anybody help me, i wanna to calculate the BER of the output of ofdm. i attached the file simulation.Best Regards.
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October 8, 2015 at 10:43 am #26020alistuParticipant
Hi Alabbas,
There is no attachment to your post. However, for this purpose you’d better choose the BER test set at the test set library of the Optisystem and tick the OFDM box in it. Then you have to set the parameters the same as the ones you have used in you OFDM modulator and demodulator components.
Regards
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October 9, 2015 at 8:46 am #26080Alabbas Ahmed AbduljabbarParticipant
sorry for confused, I attached the file now.
I need to see the Eye diagram and BER so what is the method to connect BER Analyzer.
Regards.
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October 8, 2015 at 12:27 pm #26031Prarthana KashyapParticipant
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October 8, 2015 at 8:30 pm #26037Ajay VyasParticipant
There are various method to calculate the BER at output
You can use Eye diagram visualizer, BER visualizer, BER test.-
October 9, 2015 at 2:56 pm #26115Alabbas Ahmed AbduljabbarParticipant
how can connect BER visualizer?
THANKS
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October 10, 2015 at 1:45 am #26132alistuParticipant
Here I have attached an image of the BER analyzer being attached in your system. Perhaps Ajay could kindly check the connected BER analyzer and see why the BER analyzer doesn’t show the proper results, even though it is connected according to the way it should. Please download the attached osd file.
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October 10, 2015 at 9:38 am #26165Alabbas Ahmed AbduljabbarParticipant
thanks a lot for help me
now i change some properties like sequence length and samples per bit and u can see the result in file attached
but why cannot see the eye like picture attached -
October 10, 2015 at 10:23 am #26168alistuParticipant
I ran the simulation and your system seems to be giving a good eye pattern. I think the reason for it being not as thick as the one shown in the image you have attached (and also the reason for the Q-factor figure being somehow sharp) is the fact that the sequence length you have used is rather short.
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October 9, 2015 at 8:43 am #26078Alabbas Ahmed AbduljabbarParticipant
thank all for reply
sorry for confused, I attached the file now
I need to see the Eye diagram and BER.. what is the method to connect BER Analyzer
Regards
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October 9, 2015 at 9:08 am #26084alistuParticipant
In the file you have attached, the BER Analyzer is correctly connected. The fact that it doesn’t show the desired results is probably due to some other problem in the system. I tried to decrease the sequence length in layout parameters (to increase samples per bit from 1 after that) and faced an error caused by OFDM demodulation component while the simulation was running.
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October 9, 2015 at 9:30 am #26088Alabbas Ahmed AbduljabbarParticipant
SO What is the solution?
Actually i wanna design ofdm wdm pon like the file attached but my problem in ofdm !!thanks a lot
Regards -
October 9, 2015 at 9:42 am #26094alistuParticipant
My simple suggestion is to start with OptiSystem DDO-OFDM sample and try to apply the changes to it step by step and try to get the desired results after each step. Otherwise, it may be hard to tell which part of the system causes the problem. Yours had some differences with the sample file, like the value of samples ber bit being one, which should be more.
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