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How we can calculate the Q-factor for an Optical M-QAM-OFDM signal in DDO-OFDM or CO-OFDM ?

Created: Jun 28, 2019 04:24:48Latest reply: Jun 28, 2019 04:39:02 318 1 1 0 0
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Q-factor= 20*log10(sqrt(2)*(erfcinv(2*(BER))));
I have searched a lot but unfortunately I only found the equation above that calculate the Q from BER ,but the Q will be infinity when the BER is 0. Also,when we need to calculate the Q for each individual subcarrier , the Q will be infinity for some of them.
In addition, is it applicable for all the M-size QAM and all the O-OFDM systems like DDO-OFDM or CO-OFDM?
So,is there any other way to find the Q-factor for optical QAM-OFDM ? may be for the Eb/No or others?


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anildip
Created Jun 28, 2019 04:39:02

You can use that equation to calculate Q-factor,
But, I want to understand how you got BER=0; this result is experimental!
if Not,you may increase iteration, using Monte Carlo Methods, so, BER will be different from 0, and then you can calculate Q-Factor!
View more
  • x
  • convention：
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anildip
anildip Created Jun 28, 2019 04:39:02

You can use that equation to calculate Q-factor,
But, I want to understand how you got BER=0; this result is experimental!
if Not,you may increase iteration, using Monte Carlo Methods, so, BER will be different from 0, and then you can calculate Q-Factor!
View more
  • x
  • convention：
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