Based on your calculations, I have decided to get a LIMESDR-PCIe. The sampling rate will be 122,88 MSPS which will give 61.44 MHz I and 61.44 MHz Q. That will be enough to demodulate a 50 MHz wide QPSK modulated signal. I am not sure if I can decimate the 122,88 MSPS by 2 and still being able to correctly demodulate the signal. Any Ideas?
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