I want to make a full-fledged communication system so that data from one USRP is transferred to another USRP. To do this, I studied two tutorials: QPSK and Packet Communication.
At first I tested their work separately. Packet transmission works without problems. For some reason, the signal constellation of QPSK modulation depended on the input data, and it worked most correctly with Random Source. I tried to combine them together. Results on the screenshots: data transmission and data receiver As you can see in the screenshot what is happening, the signal constellation on the transmission seems to have stopped, but on receiver it does not correspond to what is expected In the transfer file I will send one message: Hello_world! I expect that in the reception file, I expect the sequence - Hello_world! What can I change in my scheme to achieve the desired result?
