Why received signal not in a circle

4P15R95)_J$Y14F$RVJQAW I have successfully transmit IQ signal shown in the picture. However, in received signal, there are 4 plots which are not in the circle. I want to figure out it.(_IV8`DT28F5B}GIJCSOA60

The fact that you have a sample point at 1,1 suggests you are overdriving the device, and going into compression. Check your gains on RX.


Thank you very very much! It worked!