I am using FMCOMMS3 connected to Zedboard. I have generated LTE test signal by Matlab LTE toolbox, played it through the fmcomms3, looped it back to RX and saw a correct LTE signal in frequency domain in the IIO Scope analyzer. then i captured the signal, saved it in mat-file, opened the file in Matlab and found two vectors which I guess I and Q. My goal is to draw constellation and calculate EVM. now I have two questions:
1. the captured vectors - are they I and Q after decoding or before?
2. what are logical and mathematical actions should I do with these vectors in order to get real I and Q values of every symbol and finally to draw constellation and calculate EVM?
Best Regards, Michael.