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nik.paprocki.
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June 19, 2021 at 2:51 pm #79686
Agatha Binka
ParticipantHello everyone,
What is the difference between the frequency in the sine generator and the frequency in the quadrature modulator? if the frequency of the sine generator is the radio frequency that we specify, then what is the function of the frequency in the quadrature modulator? is that carrier frequency? and how to determine the frequency of the quadrature modulator?
Why in the sample used 11 GHz as radio frequency in sine generator and 2 GHz in quadrature modulator?Here i attached sample from optisystem sample
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June 21, 2021 at 11:18 am #80093
Ahmad Atieh
ModeratorDear Agatha,
the sine wave provides the RoF frequency. However, the Quadrature modulator offer an intermediate frequency for the OFDM subcarriers. You may check the RF spectrum analyzer to view the spectrum of the OFDM signal. The designer chooses these frequencies. There was limitation on the available equipment to conduct the experimental realization of this design. That is why those frequencies were chosen based on the equipment.
Attached is a paper that summaries the work presented at CLEO2021.
Regards,
Ahmad -
June 21, 2021 at 11:18 am #82697
Ahmad Atieh
ModeratorDear Agatha,
the sine wave provides the RoF frequency. However, the Quadrature modulator offer an intermediate frequency for the OFDM subcarriers. You may check the RF spectrum analyzer to view the spectrum of the OFDM signal. The designer chooses these frequencies. There was limitation on the available equipment to conduct the experimental realization of this design. That is why those frequencies were chosen based on the equipment.
Attached is a paper that summaries the work presented at CLEO2021.
Regards,
Ahmad -
June 21, 2021 at 1:32 pm #80095
Agatha Binka
ParticipantThank your Mr. Ahmad for the answer
Mr. Ahmad, do you know how to measure whether it is good or bad the BER results from the BER Test component? Because the BER results from the BER test are not the same as the minimum BER results from the BER analyzer. Where the minimum BER analyzer result can be said it is good if the BER value is less than 10^-12.
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June 21, 2021 at 1:32 pm #82699
Agatha Binka
ParticipantThank your Mr. Ahmad for the answer
Mr. Ahmad, do you know how to measure whether it is good or bad the BER results from the BER Test component? Because the BER results from the BER test are not the same as the minimum BER results from the BER analyzer. Where the minimum BER analyzer result can be said it is good if the BER value is less than 10^-12.
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June 21, 2021 at 2:04 pm #80097
Ahmad Atieh
ModeratorHello Agatha,
typically with advanced modulation systems, the target for FEC operational system is around 1E-3 depending. There is a standard parameter used in the industry for these communication systems. The 1E-12 is typically used for 10G system with no FEC. This is mainly for old systems.
Regards,
Ahmad -
June 21, 2021 at 2:04 pm #82701
Ahmad Atieh
ModeratorHello Agatha,
typically with advanced modulation systems, the target for FEC operational system is around 1E-3 depending. There is a standard parameter used in the industry for these communication systems. The 1E-12 is typically used for 10G system with no FEC. This is mainly for old systems.
Regards,
Ahmad -
June 21, 2021 at 2:13 pm #80099
Agatha Binka
ParticipantIs there any reference that I can read about the target for FEC operational system 1E-3?
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June 21, 2021 at 2:13 pm #82703
Agatha Binka
ParticipantIs there any reference that I can read about the target for FEC operational system 1E-3?
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June 21, 2021 at 3:19 pm #80101
Ahmad Atieh
Moderatorhere are two references.
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June 21, 2021 at 3:19 pm #82705
Ahmad Atieh
Moderatorhere are two references.
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June 21, 2021 at 3:21 pm #80103
Agatha Binka
ParticipantThank you very much Mr. Ahmad for your answers and the references.
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June 21, 2021 at 3:21 pm #82707
Agatha Binka
ParticipantThank you very much Mr. Ahmad for your answers and the references.
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