- This topic has 7 replies, 3 voices, and was last updated 9 years, 3 months ago by
Dhananjay Patel.
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August 19, 2015 at 3:56 am #23832
Dhananjay PatelParticipantDear Damian,
Can I use the new OFDM Modulator and Demodulator block with Free space optics channel instead of fiber. If yes, what modifications should I need to do with the same. Kindly help
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August 19, 2015 at 12:38 pm #23859
alistuParticipantHi Dhananjay, I think you’d better start simulating just by replacing the fiber optic channel with free space optics channel and see if you can get any results. I have checked a few papers (which if you are interested I can introduce) and found no major difference in implementation. There’s also a relevant discussion going on in the following forum:
Cheers!
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August 20, 2015 at 2:18 am #23867Dhananjay PatelParticipant
Dear Alitsu,
I have gone through the entire conversation in the link given by you. I am planning to use LED instead of Laser to transmit a signal through FSo along with OFDM modulation. But I am not getting sufficient results. Let me know if you have any papers regarding the system which I am trying to design.
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August 20, 2015 at 3:06 am #23878alistuParticipant
Dear Dhananjay, Unfortunately I don’t have any papers regarding OFDM-FSO with LED, but there are papers regarding FSO-OFDM. What I was implying was that you first implement the system regardless of the FSO channel and then make the adjustments. It would also help if you attach your osd file so I can check it to find the problem if I can. Thank you.
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August 20, 2015 at 4:02 am #23888
Ashu vermaParticipantHi dhanajy,visit the link
I have attached a fso link file on the name of chee.osd.you can get help from this file.this is a coherent detection ofdm system.But for use of led you need direct detection system
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August 31, 2015 at 10:09 am #24225Dhananjay PatelParticipant
Dear Sam Sung,
I had gone through the design. It is based on laser and I am planning to go with simulation based on LED’s. I simply have replaced the laser with LED and other required parameters but am not getting the output.
Besides I would like to know whether the new OFDM demodulator block is compatible with FSO transmission instead of fiber transmission. The new OFDM modulator block has got fiber dispersion compensation, thats the reason I am wondering whether it will work with FSO system or not.
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August 31, 2015 at 10:15 am #24226alistuParticipant
Hi Dhananjay, I think there have been some similar problems to yours regarding this problem and I haven’t been able to help much, but I think it would be a good idea if you attach your simulation file (if possible) for me and others to observe your progress and be able to make changes and see if we can help. Thank you.
P.S. As soon as the problem in this forum is solved, yours is hopefully solved too:
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August 31, 2015 at 10:24 am #24229Dhananjay PatelParticipant
Thank you Alitsu,
I will upload my design soon so that whatever is the error can be resolved.
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