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?
Thanks and best regards ....
Dear Younus,
I've done some bibliographical research on OFDM related metrics for my thesis, mostly related to EVM/BER/SNR though. Please take a look at the link (from page 81).
I hope this helps,
Best regards
Luiz
http://epublications.unilim.fr/theses/2012/anet-neto-luiz/anet-neto-luiz.pdf
Thanks a lot for those amazing information ......
But, I still can't calculate the Q-factor using other than BER. I could stick only to EVM,BER and SNR hopefully these are enough to show the system performance.
Thank you again
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!
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