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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.