I need to test transmission of QPSK modulated binary data. I am using Matlab along with libiio to do so. I tried sending baseband qpsk modulated samples and I tried to send passband modulated qpsk samples to the ZC702 and FMCOMMS5. In either methods the binary data I am getting after demodulation are incorrect. Also I am plotting constellation diagrams for all complex data. Only the QPSK modulated samples are as they should be. Please any help is appreciated.