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How to calculate EVM from IQ phase imbalance?

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fallangel

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How to calculate EVM from IQ phase imbalance?
 

10_1265796006.jpg


From the IQ plan :

8_1265796171.jpg
 

You can find the effect of I/Q mismatch on EVM in the attached figure
 

Thanks! Per my understanding, g is the gain imbalance, phi is the phase imbalance, but what about alphaI and alphaQ? What values should I put in my MATLAB code to generate the same plot? Thanks!


You can find the effect of I/Q mismatch on EVM in the attached figure
 

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