- This topic has 2 replies, 2 voices, and was last updated 5 years, 8 months ago by Rajveer Bhagat.
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January 1, 1970 at 12:00 am #80645Verla HersomMember
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January 1, 1970 at 12:00 am #80653Verla HersomMember
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January 1, 1970 at 12:00 am #83249Verla HersomMember
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January 1, 1970 at 12:00 am #83257Verla HersomMember
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February 19, 2019 at 6:40 am #50558Rajveer BhagatParticipant
Hi everyone.
I want to simulate OFDM based FSO link using M-QAM modulation. I replaced optical fiber in OFDM modulator project file with FSO component. When I ran the project for 4-QAM scheme, the constellation of the received signal was good. But when i tried simulating 16-QAM by changing bits/symbol to 4, the constellation diagram became distorted. Can anyone please suggest what can be done to correct this. I think it has something to do with electric constellation visualizer properties
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February 19, 2019 at 1:25 pm #50595Ahmad AtiehModerator
Hello Rajveer,
I went through your project, you could simulate 16-QAM and obtain a proper constellation. However, you need to set properly the following:
1. the global parameter symbol rate must be 2.5Gsymbol/s due to using 4bits/symbol
2. The OFDM Demodulator reference bit rate should be Bit rate/4
3. The phase of the Quadrature Demodulator should be set at 185 degThe constellation should looks like the attached file.
I recommend you using new OFDM components instead of the OFDM OS12 version. It is more flexible and has more capabilities.
Regards,
Ahmad -
February 20, 2019 at 11:31 am #50606Rajveer BhagatParticipant
Thank you sir for your help.
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February 6, 2023 at 7:20 am #81097Vamsi mohanParticipant
Hi Sir
After making all the modifications suggested by you,
why the BER shows 1 and max-Q-factor as 0 ?please reply
regards
Vamsy -
February 6, 2023 at 7:20 am #83701Vamsi mohanParticipant
Hi Sir
After making all the modifications suggested by you,
why the BER shows 1 and max-Q-factor as 0 ?please reply
regards
Vamsy -
February 6, 2023 at 12:13 pm #81101Ahmad AtiehModerator
Dear Vamsy,
you need to email me your project as Zip file and let me know the version of OptiSystem that you use. My email is ahmad.atieh@optiwave.com.
Also, let me know if you have valid maintenance and support license.
Regards,
Ahmad -
February 6, 2023 at 12:13 pm #83705Ahmad AtiehModerator
Dear Vamsy,
you need to email me your project as Zip file and let me know the version of OptiSystem that you use. My email is ahmad.atieh@optiwave.com.
Also, let me know if you have valid maintenance and support license.
Regards,
Ahmad -
February 7, 2023 at 3:56 am #81107Vamsi mohanParticipant
Hi sir
The project is already attached in the first thread of this post
regards
Vamsy -
February 7, 2023 at 3:56 am #83711Vamsi mohanParticipant
Hi sir
The project is already attached in the first thread of this post
regards
Vamsy
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