BER analyzer problem in Coherent detection QPSK system - Optiwave

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This topic has 4 replies, 4 voices, and was last updated 7 years, 10 months ago by Priti Garg.

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- November 25, 2016 at 3:33 pm #41710
  
  Mahmudul Islam
  Participant
  
  I simulate the coherent detection QPSK system file from optisystem 13 samples but the min BER is 1 and Q factor is 0. Can anyone help me???
- November 25, 2016 at 3:37 pm #41712
  
  Mahmudul Islam
  Participant
  
  Please any expert help me
- January 3, 2017 at 8:48 am #41889
  
  jagan padhy
  Participant
  
  Hallo everybody,I am also finding the same problem in BER analyser.eventhough eye diagram is comming but the values of q factor and ber rate is 0 and 1.so please help,anyone experts
- January 3, 2017 at 9:00 am #41895
  
  Damian Marek
  Participant
  
  You will notice that in our most recent project files we no longer use the BER Analyzer for Advanced Modulation formats. Constellation visualizers or BER Test Sets are used to calculate the BER.
  
  The reason being the BER Analyzer approximates the BER from analyzing the noise and eye characteristics. However, in the example you attach the electrical signal is being regenerated right before the BER Analyzer creating a signal with no noise or distortion in any way, even though the signal might actually be regenerated incorrectly.
- February 23, 2017 at 11:47 pm #42551
  
  Priti Garg
  Participant
  
  hi Damian
  
  I read in one of the posts that there is a bug in BER test set, i am using it to find BER for an ofdm based system can u please clarify.
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