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December 9, 2015 at 11:13 am #28603
Debanjan SarkarParticipanthello all,
I have run the radio over fiber scm ASK. osd from examples given with the software. In this design when i change the power of cw laser the q-factor of the system change with a fraction only. the data that i have got are given below
cutoff frequency of am demodulator=0.6
cw laser power BER analyser1 q-factor value
0 dbm 8.42005
6 dbm 8.54212
12 dbm 8.42961
18 dbm 7.84567
24 dbm 8.14978my question is ” am i able to plot BER curve with this value that is almost same and why the values of q -factor not change with the value of power??”
find the attachment of the file.
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December 9, 2015 at 12:27 pm #28612
alistuParticipantHi Debanjan,
I ran the simulation for some values of laser and got results different from yours. What’s more, the results had slight changes by repeating the simulation. So I suggest you increase the sequence length (say, to 4096 or 2048) and do the simulations again. I did this for three laser values and the results showed constant yet rather small improvement by increasing the power.
Regards
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December 10, 2015 at 3:51 am #28642Debanjan SarkarParticipant
thank you alistu. i will try.
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December 10, 2015 at 8:36 am #28654Debanjan SarkarParticipant
For what reason this Q value is constant irrespective of any value of laser power. In practical scenario this should not occur. Can you suggest how I can plot the BER curves in this particular case.
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December 10, 2015 at 11:22 am #28665Debanjan SarkarParticipant
thank you alistu. but can you tell me reason why Q value is almost constant??
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December 10, 2015 at 11:31 am #28667alistuParticipant
Can you please upload the image of the plot you have acquired using sweep iterations? If you consider a wide range of launched power and do the simulations, changes in some input power areas must be evident. Otherwise, I am guessing the input power range has not been considered wide enough.
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December 12, 2015 at 1:45 am #28703
Ravil
ParticipantHi Debanjan,
If I am not mistaken and remember it correctly, I have such a problem of “not changing Q-factor” couple times. As Alistu recommended, I did increase the range of my power set and that gave me Q-factor dependence. At the same time, I would recommend you to look at the regime that you are working at for your launched powers. It is know that high values will increase the influence of non-linear effects in your system.
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December 12, 2015 at 1:49 am #28704Participant
On the other side, small values of launched power will decrease you power received and bring it close to the threshold of your receiver. Anyways, as it was recommended by Alistu, please upload the image of your plot and indicate the whole range of powers that you have worked with. It will definitely help us to better assist you with your question…
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November 19, 2024 at 3:50 pm #88535
hawkar assad
Participant(Awaiting moderation)
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