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how to deal with DC offset in ad9361 of plutosdr

Category: Hardware
Product Number: ad9361

I made a new firmware for plutosdr and it is act good. In the final step, there is a 4QAM judgement for rx signal,  it is clear that the step did a right work form this graph,  but I think a DC offset is separating my IQ wave. I am not sure what happen to data correctly and don't know how to deal with it.

by the way, I'm running ad9361-iiostream.c.

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