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PRBS generator sequence length

(joined December 2019)
Participant

Hello Everyone

Can anyone tell me what is the logic behind choosing different sequence lengths of PRBS generator in OptiSystem. Does a particular sequence length choosen has any relation with the data rate or other parameters of the simulation model.
I’m working over 128 Gbps DP-QPSK based FSO transceiver design in Optisystem. I have taken PRBS generator sequence length of 2^17-1. Could I go for higher sequence lengths or not?

Responses (1):

    • #67647
      Sahil Nazir
      Participant

      Hello Everyone

      Can anyone tell me what is the logic behind choosing different sequence lengths of PRBS generator in OptiSystem. Does a particular sequence length choosen has any relation with the data rate or other parameters of the simulation model.
      I’m working over 128 Gbps DP-QPSK based FSO transceiver design in Optisystem. I have taken PRBS generator sequence length of 2^17-1. Could I go for higher sequence lengths or not?

    • #67665
      Profile Photo
      Ahmad Atieh
      Moderator

      Hello Sahil,
      The PRBS generator is used to produce bits that could represent actual data transmitted in real life. The longer the bit sequence the better. However, that causes limitation on the computer memory and speed of calculations. Typically, 2^16-1 is suitable for the modulation scheme you are using. In OptiSystem, we allow total bit sequence and samples per bit (equal to number of samples) to 2^31-1. so you can adjust both parameters to be within this limit.
      Regards,
      Ahmad

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