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PSK demodulator does not recover the transmitted bits correctly

Hi everyone,

I have a problem with the demodulator: when I disable the differential PSK mode, the received bits sometimes do not match the transmitted bits at all. I have also tried to set up guard bits and sync bits similarly to the example "MT PSK Transceiver (One Shot)" but it does not solve the problem (in the attached vi I have removed synchronisation). Anyone can help me to check what the problem really is and how to solve it? Thanks in advance, have a nice day.

 

PSK_transmission: sub vi containing all modulation-side blocks, including the generated bitstream.

PSK_full: main vi containing "PSK_transmission" , the block for adding AWGN, and the demodulator block.

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