- This topic has 5 replies, 2 voices, and was last updated 2 years, 3 months ago by
Sawyer Ge.
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August 22, 2022 at 12:49 pm #79885
Rajat kumar
MemberRespected sir,
I was sharing design for OFDM -QAM using LOS model for VLC . Problem arising in receiver constellation. Can we directly Drive LED after electrical rescale as frequency is in range of GHZ . can White LED transmit power of 1 watt or 2 can be changed by changing slope efficiency?. -
August 25, 2022 at 12:23 pm #80879
Ahmad AtiehModeratorDear Rajat,
The problem of LED is producing non-coherent light which cause the QAM signal to face lots of distortion as it uses in-phase and quadrature components to carry the OFDM signal.
please note that you can’t load OptiSystem projects to the forum. You need to send them as zip files.
Regards,
Ahmad -
August 25, 2022 at 12:23 pm #83483Ahmad AtiehModerator
Dear Rajat,
The problem of LED is producing non-coherent light which cause the QAM signal to face lots of distortion as it uses in-phase and quadrature components to carry the OFDM signal.
please note that you can’t load OptiSystem projects to the forum. You need to send them as zip files.
Regards,
Ahmad -
August 26, 2022 at 5:12 am #80887
Merri CormackMemberRespected sir,
I have referred few research articles where they have simulated and received OFDM QAM using white LED . How to decide the filter at receiver after PIN for receiving OFDM Qam . In shared design what changes I need to implement to get required constellation .
thanks. Sorry for uploading Project to forum. Sharing zip file for reference . -
August 26, 2022 at 5:12 am #83491Merri CormackMember
Respected sir,
I have referred few research articles where they have simulated and received OFDM QAM using white LED . How to decide the filter at receiver after PIN for receiving OFDM Qam . In shared design what changes I need to implement to get required constellation .
thanks. Sorry for uploading Project to forum. Sharing zip file for reference . -
August 26, 2022 at 12:57 pm #80889Ahmad AtiehModerator
Dear Rajat,
could you please email me the articles that describe using LED with OFDM/QAM to my email at ahmad.atieh@optiwave.com?
Regards,
Ahmad -
August 26, 2022 at 12:57 pm #83493Ahmad AtiehModerator
Dear Rajat,
could you please email me the articles that describe using LED with OFDM/QAM to my email at ahmad.atieh@optiwave.com?
Regards,
Ahmad -
August 27, 2022 at 4:51 am #80891Merri CormackMember
Respected sir I have emailed the article on ahmed.atieh@optiwave.com which was published in wireless personal communication in 2019. thanks and regards
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August 27, 2022 at 4:51 am #83495Merri CormackMember
Respected sir I have emailed the article on ahmed.atieh@optiwave.com which was published in wireless personal communication in 2019. thanks and regards
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August 27, 2022 at 1:06 pm #80893Ahmad AtiehModerator
I did receive the paper. I am not fully convinced that the results are correct.
The range of the FSO channel used in the paper is 1m, which is not possible in this component. in addition to my original point about coherence of light produced by LED would not support QAM where phase between in-phase and quadrature is very important. Algorithms in the DSP are used to correct for that.
Could you please communicate with me through my email ahmad.atieh@optiwave.com?
Regards,
Ahmad -
August 27, 2022 at 1:06 pm #83497Ahmad AtiehModerator
I did receive the paper. I am not fully convinced that the results are correct.
The range of the FSO channel used in the paper is 1m, which is not possible in this component. in addition to my original point about coherence of light produced by LED would not support QAM where phase between in-phase and quadrature is very important. Algorithms in the DSP are used to correct for that.
Could you please communicate with me through my email ahmad.atieh@optiwave.com?
Regards,
Ahmad
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