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August 13, 2014 at 1:34 pm
#13216
Hi Mai,
The BER Analyzer approximates the BER by analyzing the eye diagram. Since there is a threshold detector before it the eye diagram is “perfect”, which results in the unrealistically high Q factor. For QAM modulation it would be better to use either the BER Test Set (with a suitably long sequence) or you could use the error vector magnitude metric, which is generally used for QAM signals. This is calculated by the electrical constellation visualizer.
Regards
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